⚠️ Warning: This is a draft ⚠️

This means it might contain formatting issues, incorrect code, conceptual problems, or other severe issues.

If you want to help to improve and eventually enable this page, please fork RosettaGit's repository and open a merge request on GitHub.

{{task|Date and time}} Create a routine that will generate a text calendar for any year. Test the calendar by generating a calendar for the year 1969, on a device of the time. Choose one of the following devices:

• A line printer with a width of 132 characters.
• An [[wp:IBM_3270#Displays|IBM 3278 model 4 terminal]] (80×43 display with accented characters). Target formatting the months of the year to fit nicely across the 80 character width screen. Restrict number of lines in test output to 43.

(Ideally, the program will generate well-formatted calendars for any page width from 20 characters up.)

Kudos (κῦδος) for routines that also transition from [https://en.wikipedia.org/wiki/Julian_calendar Julian] to [https://en.wikipedia.org/wiki/Gregorian_calendar Gregorian calendar].

This task is inspired by [http://www.ee.ryerson.ca/~elf/hack/realmen.html Real Programmers Don't Use PASCAL] by Ed Post, Datamation, volume 29 number 7, July 1983. THE REAL PROGRAMMER'S NATURAL HABITAT "Taped to the wall is a line-printer Snoopy calender for the year 1969." For further Kudos see task [[Calendar - for "real" programmers|CALENDAR]], where all code is to be in UPPERCASE.

For economy of size, do not actually include Snoopy generation in either the code or the output, instead just output a place-holder.

## 360 Assembly

{{trans|Free Basic}} This program uses no external functions but two ASSIST macros (XDECO, XPRNT) to keep the code as short as possible.

*        calendar                  08/06/2016
CALENDAR CSECT
USING  CALENDAR,R13       base register
B      72(R15)            skip savearea
DC     17F'0'             savearea
STM    R14,R12,12(R13)    prolog
ST     R13,4(R15)         "
ST     R15,8(R13)         "
LR     R13,R15            "
L      R4,YEAR            year
SRDA   R4,32              .
D      R4,=F'4'           year//4
LTR    R4,R4              if year//4=0
BNZ    LYNOT
L      R4,YEAR            year
SRDA   R4,32              .
D      R4,=F'100'         year//100
LTR    R4,R4              if year//100=0
BNZ    LY
L      R4,YEAR            year
SRDA   R4,32              .
D      R4,=F'400'         if year//400
LTR    R4,R4              if year//400=0
BNZ    LYNOT
LY       MVC    ML+2,=H'29'        ml(2)=29  leapyear
LYNOT    SR     R10,R10            ltd1=0
LA     R6,1               i=1
LOOPI1   C      R6,=F'31'          do i=1 to 31
BH     ELOOPI1
XDECO  R6,XDEC            edit i
LA     R14,TD1            td1
AR     R14,R10            td1+ltd1
MVC    0(3,R14),XDEC+9    sub(td1,ltd1+1,3)=pic(i,3)
LA     R10,3(R10)         ltd1+3
LA     R6,1(R6)           i=i+1
B      LOOPI1
ELOOPI1  LA     R6,1               i=1
LOOPI2   C      R6,=F'12'          do i=1 to 12
BH     ELOOPI2
ST     R6,M               m=i
MVC    D,=F'1'            d=1
MVC    YY,YEAR            yy=year
L      R4,M               m
C      R4,=F'3'           if m<3
BNL    GE3
L      R2,M               m
LA     R2,12(R2)          m+12
ST     R2,M               m=m+12
L      R2,YY              yy
BCTR   R2,0               yy-1
ST     R2,YY              yy=yy-1
GE3      L      R2,YY              yy
LR     R1,R2              yy
SRA    R1,2               yy/4
AR     R2,R1              yy+(yy/4)
L      R4,YY              yy
SRDA   R4,32              .
D      R4,=F'100'         yy/100
SR     R2,R5              yy+(yy/4)-(yy/100)
L      R4,YY              yy
SRDA   R4,32              .
D      R4,=F'400'         yy/400
AR     R2,R5              yy+(yy/4)-(yy/100)+(yy/400)
A      R2,D               r2=yy+(yy/4)-(yy/100)+(yy/400)+d
LA     R5,153             153
M      R4,M               153*m
LA     R5,8(R5)           153*m+8
D      R4,=F'5'           (153*m+8)/5
AR     R5,R2              ((153*m+8)/5+r2
LA     R4,0               .
D      R4,=F'7'           r4=mod(r5,7)  0=sun 1=mon ... 6=sat
LTR    R4,R4              if j=0
BNZ    JNE0
LA     R4,7               j=7
JNE0     BCTR   R4,0               j-1
MH     R4,=H'3'           j*3
LR     R10,R4             j1=j*3
LR     R1,R6              i
SLA    R1,1               *2
LH     R11,ML-2(R1)       ml(i)
MH     R11,=H'3'          j2=ml(i)*3
MVC    TD2,BLANK          td2=' '
LA     R4,TD1             @td1
LR     R5,R11             j2
LA     R2,TD2             @td2
AR     R2,R10             @td2+j1
LR     R3,R5              j2
MVCL   R2,R4              sub(td2,j1+1,j2)=sub(td1,1,j2)
LR     R1,R6              i
MH     R1,=H'144'         *144
LA     R14,DA-144(R1)     @da(i)
MVC    0(144,R14),TD2     da(i)=td2
LA     R6,1(R6)           i=i+1
B      LOOPI2
ELOOPI2  L      R1,YEAR            year
XDECO  R1,PG+23           edit year
XPRNT  PG,35              print year
MVC    WDLINE,BLANK       wdline=' '
LA     R10,1              lwdline=1
LA     R8,1               k=1
LOOPK3   C      R8,=F'3'           do k=1 to 3
BH     ELOOPK3
LA     R4,WDLINE          @wdline
AR     R4,R10             +lwdline
MVC    0(20,R4),WDNA      sub(wdline,lwdline+1,20)=wdna
LA     R10,20(R10)        lwdline=lwdline+20
C      R8,=F'3'           if k<3
BNL    ITERK3
LA     R10,2(R10)         lwdline=lwdline+2
ITERK3   LA     R8,1(R8)           k=k+1
B      LOOPK3
ELOOPK3  LA     R6,1               i=1
LOOPI4   C      R6,=F'12'          do i=1 to 12 by 3
BH     ELOOPI4
MVC    MOLINE,BLANK       moline=' '
LA     R10,6              lmoline=6
LR     R8,R6              k=i
LOOPK4   LA     R2,2(R6)           i+2
CR     R8,R2              do k=i to i+2
BH     ELOOPK4
LR     R1,R8              k
MH     R1,=H'10'          *10
LA     R3,MO-10(R1)       mo(k)
LA     R4,MOLINE          @moline
AR     R4,R10             +lmoline
MVC    0(10,R4),0(R3)     sub(moline,lmoline+1,10)=mo(k)
LA     R10,22(R10)        lmoline=lmoline+22
LA     R8,1(R8)           k=k+1
B      LOOPK4
ELOOPK4  XPRNT  MOLINE,L'MOLINE    print months
XPRNT  WDLINE,L'WDLINE    print days of week
LA     R7,1               j=1
LOOPJ4   C      R7,=F'106'         do j=1 to 106 by 21
BH     ELOOPJ4
MVC    PG,BLANK           clear buffer
LA     R9,PG              pgi=0
LR     R8,R6              k=i
LOOPK5   LA     R2,2(R6)           i+2
CR     R8,R2              do k=i to i+2
BH     ELOOPK5
LR     R1,R8              k
MH     R1,=H'144'         *144
LA     R4,DA-144(R1)      da(k)
BCTR   R4,0               -1
AR     R4,R7              +j
MVC    0(21,R9),0(R4)     substr(da(k),j,21)
LA     R9,22(R9)          pgi=pgi+22
LA     R8,1(R8)           k=k+1
B      LOOPK5
ELOOPK5  XPRNT  PG,L'PG            print buffer
LA     R7,21(R7)          j=j+21
B      LOOPJ4
ELOOPJ4  LA     R6,3(R6)           i=i+3
B      LOOPI4
ELOOPI4  L      R13,4(0,R13)       epilog
LM     R14,R12,12(R13)    "
XR     R15,R15            "
BR     R14                exit
LTORG
YEAR     DC     F'1969'            <==
MO       DC     CL10' January  ',CL10' February ',CL10'  March   '
DC     CL10'  April   ',CL10'   May    ',CL10'   June   '
DC     CL10'   July   ',CL10'  August  ',CL10'September '
DC     CL10' October  ',CL10' November ',CL10' December '
ML       DC     H'31',H'28',H'31',H'30',H'31',H'30'
DC     H'31',H'31',H'30',H'31',H'30',H'31'
WDNA     DC     CL20'Mo Tu We Th Fr Sa Su'
M        DS     F
D        DS     F
YY       DS     F
TD1      DS     CL93
TD2      DS     CL144
MOLINE   DS     CL66
WDLINE   DS     CL66
PG       DC     CL66' '
XDEC     DS     CL12
BLANK    DC     CL144' '
DA       DS     12CL144
YREG
END    CALENDAR


{{out}}


2016
January               February               March
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3   1  2  3  4  5  6  7      1  2  3  4  5  6
4  5  6  7  8  9 10   8  9 10 11 12 13 14   7  8  9 10 11 12 13
11 12 13 14 15 16 17  15 16 17 18 19 20 21  14 15 16 17 18 19 20
18 19 20 21 22 23 24  22 23 24 25 26 27 28  21 22 23 24 25 26 27
25 26 27 28 29 30 31  29                    28 29 30 31

April                  May                   June
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3                     1         1  2  3  4  5
4  5  6  7  8  9 10   2  3  4  5  6  7  8   6  7  8  9 10 11 12
11 12 13 14 15 16 17   9 10 11 12 13 14 15  13 14 15 16 17 18 19
18 19 20 21 22 23 24  16 17 18 19 20 21 22  20 21 22 23 24 25 26
25 26 27 28 29 30     23 24 25 26 27 28 29  27 28 29 30
30 31
July                 August              September
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3   1  2  3  4  5  6  7            1  2  3  4
4  5  6  7  8  9 10   8  9 10 11 12 13 14   5  6  7  8  9 10 11
11 12 13 14 15 16 17  15 16 17 18 19 20 21  12 13 14 15 16 17 18
18 19 20 21 22 23 24  22 23 24 25 26 27 28  19 20 21 22 23 24 25
25 26 27 28 29 30 31  29 30 31              26 27 28 29 30

October               November              December
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2      1  2  3  4  5  6            1  2  3  4
3  4  5  6  7  8  9   7  8  9 10 11 12 13   5  6  7  8  9 10 11
10 11 12 13 14 15 16  14 15 16 17 18 19 20  12 13 14 15 16 17 18
17 18 19 20 21 22 23  21 22 23 24 25 26 27  19 20 21 22 23 24 25
24 25 26 27 28 29 30  28 29 30              26 27 28 29 30 31
31



We first specify a "Printable_Calendar" package (printable_calendar.ads). One can easily override the default names for weekdays and months, see the [[Calendar_-for"real"_programmers#Ada]] task.

with Ada.Calendar.Formatting;

package Printable_Calendar is

subtype String20 is String(1 .. 20);
type Month_Rep_Type is array (Ada.Calendar.Month_Number) of String20;

type Description is record
Weekday_Rep: String20;
Month_Rep: Month_Rep_Type;
end record;
-- for internationalization, you only need to define a new description

Default_Description: constant Description :=
(Weekday_Rep =>
"Mo Tu We Th Fr Sa So",
Month_Rep   =>
("      January       ", "      February      ", "       March        ",
"       April        ", "        May         ", "        June        ",
"        July        ", "       August       ", "      September     ",
"       October      ", "      November      ", "      December      "));

type Calendar (<>) is tagged private;

-- Initialize a calendar for devices with 80- or 132-characters per row
function Init_80(Des: Description := Default_Description) return Calendar;
function Init_132(Des: Description := Default_Description) return Calendar;

-- the following procedures output to standard IO; override if neccessary
procedure New_Line(Cal: Calendar);
procedure Put_String(Cal: Calendar; S: String);

-- the following procedures do the real stuff
procedure Print_Line_Centered(Cal: Calendar'Class; Line: String);
procedure Print(Cal: Calendar'Class;
Year_String: String); -- this is the main Thing

private
type Calendar is tagged record
Columns, Rows, Space_Between_Columns: Positive;
Left_Space: Natural;

Weekday_Rep: String20;
Month_Rep: Month_Rep_Type;
end record;

end Printable_Calendar;


We continue with the implementation (printable_calendar.ads):

with Ada.Text_IO;

package body Printable_Calendar is

function Days_Per_Month(Year: Year_Number; Month: Month_Number)
return Day_Number is
begin
case Month is
when 1 | 3 | 5 | 7 | 8 | 10 | 12 => return 31;
when 4 | 6 | 9 | 11              => return 30;
when 2 =>
if Year mod 4 /= 0 then
return 28;
elsif Year mod 100 /= 0 then
return 29;
elsif Year mod 400 /= 0 then
return 28;
else
return 29;
end if;
end case;
end Days_Per_Month;

type Full_Month_Rep is array (1 .. 6) of String20;
return Full_Month_Rep is

X: Full_Month_Rep := (others => "                    ");
-- If X=Generate_Printable_Month(2011, 01), the result could be
--  "       January      ", -- Month_Rep(01)
--  "Mo Tu We Th Fr Sa Su"  -- Weekday_Rep
--  "                1  2"  -- X(1)
--  " 3  4  5  6  7  8  9"  -- X(2)
--  "10 11 12 13 14 15 16"  -- X(3)
--  "17 18 19 20 21 22 23"  -- X(4)
--  "24 25 26 27 28 29 30"  -- X(5)
--  "31                  "  -- X(6)

Row:       Integer range 1 .. 6  := 1;
Day_Index: constant array(F.Day_Name) of Positive
:= (1, 4, 7, 10, 13, 16, 19);
begin
for I in 1 .. Days_Per_Month(Y, M) loop
declare
Weekday: constant F.Day_Name    := F.Day_Of_Week(F.Time_Of(Y, M, I));
Pos: constant Positive          := Day_Index(Weekday);
Cleartext_Name: constant String := Day_Number'Image(I);
L: constant Positive            := Cleartext_Name'Last;
begin
X(Row)(Pos .. Pos+1) := Cleartext_Name(L-1 .. L);
if F."="(Weekday, F.Sunday) then
Row := Row + 1;
end if;
end;
end loop;
return X;
end Generate_Printable_Month;

procedure Print(Cal: Calendar'class;
Year_String: String) is

The_Month: Month_Number := Month_Number'First;

procedure Write_Space(Length: Natural) is
begin
for I in 1 .. Length loop
Cal.Put_String(" ");
end loop;
end Write_Space;

Year_Rep: array(Month_Number) of Full_Month_Rep;

begin
-- print the year
Cal.Print_Line_Centered(Year_String);

-- generate a printable form for all the months
for Month in Month_Number loop
Year_Rep(Month) := Generate_Printable_Month(Year, Month);
end loop;

begin
while True loop

-- new line
Cal.New_Line;

-- write month names
Write_Space(Cal.Left_Space);
for Month in The_Month .. The_Month+Cal.Columns-2 loop
Cal.Put_String(Cal.Month_Rep(Month));
Write_Space(Cal.Space_Between_Columns);
end loop;
Cal.Put_String(Cal.Month_Rep(The_Month+Cal.Columns-1));
Cal.New_Line;

-- write "Mo Tu .. So" - or whatever is defined by Weekday_Rep
Write_Space(Cal.Left_Space);
for Month in The_Month .. The_Month+Cal.Columns-2 loop
Cal.Put_String(Cal.Weekday_Rep);
Write_Space(Cal.Space_Between_Columns);
end loop;
Cal.Put_String(Cal.Weekday_Rep);
Cal.New_Line;

-- write the dates
for I in 1 .. 6 loop
Write_Space(Cal.Left_Space);
for Month in The_Month .. The_Month+Cal.Columns-2 loop
Cal.Put_String(Year_Rep(Month)(I));
Write_Space(Cal.Space_Between_Columns);
end loop;
Cal.Put_String(Year_Rep(The_Month+Cal.Columns-1)(I));
Cal.New_Line;
end loop;

The_Month := The_Month + Cal.Columns;
-- this will eventually raise Constraint_Error to terminate the loop
end loop;
exception
when Constraint_Error => null;
end;
end Print;

procedure New_Line(Cal: Calendar) is
begin
end New_Line;

procedure Put_String(Cal: Calendar; S: String) is
begin
end Put_String;

procedure Print_Line_Centered(Cal: Calendar'Class; Line: String) is
Width : constant Positive := Cal.Columns*20
+ (Cal.Columns-1)*Cal.Space_Between_Columns
+ Cal.Left_Space;
begin
if Line'Length    >= Width-1 then
Cal.Put_String(Line);
Cal.New_Line;
else
Print_Line_Centered(Cal, " " & Line & " ");
end if;
end Print_Line_Centered;

function Init_80(Des: Description := Default_Description) return Calendar is
X: Calendar:=
(Columns => 3, Rows => 4, Space_Between_Columns => 4,
Left_Space => 1,
Weekday_Rep =>  Des.Weekday_Rep,
Month_Rep   =>  Des.Month_Rep
);
begin
return X;
end Init_80;

function Init_132(Des: Description := Default_Description) return Calendar is
X: Calendar:=
(Columns => 6, Rows => 2, Space_Between_Columns => 2,
Left_Space => 1,
Weekday_Rep =>  Des.Weekday_Rep,
Month_Rep   =>  Des.Month_Rep
);
begin
return X;
end Init_132;

end Printable_Calendar;


Now, the main program is really simple:

with Printable_Calendar;

procedure Cal is

C: Printable_Calendar.Calendar := Printable_Calendar.Init_80;

begin
C.Print_Line_Centered("[reserved for Snoopy]");
C.New_Line;
C.Print(1969, "Nineteen-Sixty-Nine");
end Cal;


Here is the output:

                        [reserved for Snoopy]

Nineteen-Sixty-Nine

January                 February                 March
Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So
1  2  3  4  5                    1  2                    1  2
6  7  8  9 10 11 12     3  4  5  6  7  8  9     3  4  5  6  7  8  9
13 14 15 16 17 18 19    10 11 12 13 14 15 16    10 11 12 13 14 15 16
20 21 22 23 24 25 26    17 18 19 20 21 22 23    17 18 19 20 21 22 23
27 28 29 30 31          24 25 26 27 28          24 25 26 27 28 29 30
31

April                    May                     June
Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So
1  2  3  4  5  6              1  2  3  4                       1
7  8  9 10 11 12 13     5  6  7  8  9 10 11     2  3  4  5  6  7  8
14 15 16 17 18 19 20    12 13 14 15 16 17 18     9 10 11 12 13 14 15
21 22 23 24 25 26 27    19 20 21 22 23 24 25    16 17 18 19 20 21 22
28 29 30                26 27 28 29 30 31       23 24 25 26 27 28 29
30

July                   August                 September
Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So
1  2  3  4  5  6                 1  2  3     1  2  3  4  5  6  7
7  8  9 10 11 12 13     4  5  6  7  8  9 10     8  9 10 11 12 13 14
14 15 16 17 18 19 20    11 12 13 14 15 16 17    15 16 17 18 19 20 21
21 22 23 24 25 26 27    18 19 20 21 22 23 24    22 23 24 25 26 27 28
28 29 30 31             25 26 27 28 29 30 31    29 30

October                November                December
Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So    Mo Tu We Th Fr Sa So
1  2  3  4  5                    1  2     1  2  3  4  5  6  7
6  7  8  9 10 11 12     3  4  5  6  7  8  9     8  9 10 11 12 13 14
13 14 15 16 17 18 19    10 11 12 13 14 15 16    15 16 17 18 19 20 21
20 21 22 23 24 25 26    17 18 19 20 21 22 23    22 23 24 25 26 27 28
27 28 29 30 31          24 25 26 27 28 29 30    29 30 31


To get a 132-character-wide output, you just have to replace "Init_80" by "Init_132" in the main program.

## ALGOL 68

{{works with|ALGOL 68|Revision 1 - no extensions to language used}} {{works with|ALGOL 68G|Any - tested with release [http://sourceforge.net/projects/algol68/files/algol68g/algol68g-1.18.0/algol68g-1.18.0-9h.tiny.el5.centos.fc11.i386.rpm/download 1.18.0-9h.tiny].}} {{wont work with|ELLA ALGOL 68|Any (with appropriate job cards) - tested with release [http://sourceforge.net/projects/algol68/files/algol68toc/algol68toc-1.8.8d/algol68toc-1.8-8d.fc9.i386.rpm/download 1.8-8d] - due to extensive use of '''format'''[ted] ''transput''.}}

#!/usr/local/bin/a68g --script #

PROC print calendar = (INT year, page width)VOID: (

[]STRING month names = (
"January","February","March","April","May","June",
"July","August","September","October","November","December"),
weekday names = ("Su","Mo","Tu","We","Th","Fr","Sa");
FORMAT weekday fmt = $g,n(UPB weekday names - LWB weekday names)(" "g)$;

# Juggle the calendar format to fit the printer/screen width #
INT day width = UPB weekday names[1], day gap=1;
INT month width = (day width+day gap) * UPB weekday names-1;
INT month heading lines = 2;
INT month lines = (31 OVER UPB weekday names+month heading lines+2); # +2 for head/tail weeks #
INT year cols = (page width+1) OVER (month width+1);
INT year rows = (UPB month names-1)OVER year cols + 1;
INT month gap = (page width - year cols*month width + 1)OVER year cols;
INT year width = year cols*(month width+month gap)-month gap;
INT year lines = year rows*month lines;

MODE MONTHBOX = [month lines, month width]CHAR;
MODE YEARBOX  = [year  lines, year  width]CHAR;

INT week start = 1; # Sunday #

PROC days in month = (INT year, month)INT:
CASE month IN 31,
IF year MOD 4 EQ 0 AND year MOD 100 NE 0 OR year MOD 400 EQ 0 THEN 29 ELSE 28 FI,
31, 30, 31, 30, 31, 31, 30, 31, 30, 31
ESAC;

PROC day of week = (INT year, month, day)INT: (
# Day of the week by Zeller’s Congruence algorithm from 1887 #
INT y := year, m := month, d := day, c;
IF m <= 2 THEN m +:= 12; y -:= 1 FI;
c := y OVER 100;
y %*:= 100;
(d - 1 + ((m + 1) * 26) OVER 10 + y + y OVER 4 + c OVER 4 - 2 * c) MOD 7
);

MODE SIMPLEOUT = UNION(STRING, []STRING, INT);

PROC cputf = (REF[]CHAR out, FORMAT fmt, SIMPLEOUT argv)VOID:(
FILE f; STRING s; associate(f,s);
putf(f, (fmt, argv));
out[:UPB s]:=s;
close(f)
);

PROC month repr = (INT year, month)MONTHBOX:(
MONTHBOX month box; FOR line TO UPB month box DO month box[line,]:=" "* 2 UPB month box OD;
STRING month name = month names[month];

# center the title #
cputf(month box[1,(month width - UPB month name ) OVER 2+1:], $g$, month name);
cputf(month box[2,], weekday fmt, weekday names);

INT first day := day of week(year, month, 1);
FOR day TO days in month(year, month) DO
INT line = (day+first day-week start) OVER UPB weekday names + month heading lines + 1;
INT char =((day+first day-week start) MOD UPB weekday names)*(day width+day gap) + 1;
cputf(month box[line,char:char+day width-1],$g(-day width)$, day)
OD;
month box
);

PROC year repr = (INT year)YEARBOX:(
YEARBOX year box;
FOR line TO UPB year box DO year box[line,]:=" "* 2 UPB year box OD;
FOR month row FROM 0 TO year rows-1 DO
FOR month col FROM 0 TO year cols-1 DO
INT month = month row * year cols + month col + 1;
IF month > UPB month names THEN
done
ELSE
INT month col width = month width+month gap;
year box[
month row*month lines+1 : (month row+1)*month lines,
month col*month col width+1 : (month col+1)*month col width-month gap
] := month repr(year, month)
FI
OD
OD;
done: year box
);

INT center = (year cols*(month width+month gap) - month gap - 1) OVER 2;
INT indent = (page width - year width) OVER 2;

printf((
$n(indent + center - 9)k g l$, "[Insert Snoopy here]",
$n(indent + center - 1)k 4d l$, year, $l$,
$n(indent)k n(year width)(g) l$, year repr(year)
))
);

main: (
CO inspired by http://www.ee.ryerson.ca/~elf/hack/realmen.html
Real Programmers Don't Use PASCAL - Ed Post
Datamation, volume 29 number 7, July 1983
THE REAL PROGRAMMER'S NATURAL HABITAT
"Taped to the wall is a line-printer Snoopy calender for the year 1969."
CO
INT mankind stepped on the moon = 1969,
line printer width = 80; # as at 1969! #
print calendar(mankind stepped on the moon, line printer width)
)


Output:


[Insert Snoopy here]
1969

January                    February                    March
Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa
1  2  3  4                          1                          1
5  6  7  8  9 10 11        2  3  4  5  6  7  8        2  3  4  5  6  7  8
12 13 14 15 16 17 18        9 10 11 12 13 14 15        9 10 11 12 13 14 15
19 20 21 22 23 24 25       16 17 18 19 20 21 22       16 17 18 19 20 21 22
26 27 28 29 30 31          23 24 25 26 27 28          23 24 25 26 27 28 29
30 31
April                       May                        June
Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa
1  2  3  4  5                    1  2  3        1  2  3  4  5  6  7
6  7  8  9 10 11 12        4  5  6  7  8  9 10        8  9 10 11 12 13 14
13 14 15 16 17 18 19       11 12 13 14 15 16 17       15 16 17 18 19 20 21
20 21 22 23 24 25 26       18 19 20 21 22 23 24       22 23 24 25 26 27 28
27 28 29 30                25 26 27 28 29 30 31       29 30

July                      August                   September
Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa
1  2  3  4  5                       1  2           1  2  3  4  5  6
6  7  8  9 10 11 12        3  4  5  6  7  8  9        7  8  9 10 11 12 13
13 14 15 16 17 18 19       10 11 12 13 14 15 16       14 15 16 17 18 19 20
20 21 22 23 24 25 26       17 18 19 20 21 22 23       21 22 23 24 25 26 27
27 28 29 30 31             24 25 26 27 28 29 30       28 29 30
31
October                    November                   December
Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa       Su Mo Tu We Th Fr Sa
1  2  3  4                          1           1  2  3  4  5  6
5  6  7  8  9 10 11        2  3  4  5  6  7  8        7  8  9 10 11 12 13
12 13 14 15 16 17 18        9 10 11 12 13 14 15       14 15 16 17 18 19 20
19 20 21 22 23 24 25       16 17 18 19 20 21 22       21 22 23 24 25 26 27
26 27 28 29 30 31          23 24 25 26 27 28 29       28 29 30 31
30



## ALGOL W

{{trans|Simula}} which is a {{trans|C}} This is pretty much the same as the Simula version.

The main differences are that the "for" loop counter in Algol W is a separate variable that only exists during execution of the loop whereas in Simula the loop counter must be declared outside the loop and has its value changed as the loop executes

• hence some of the "for" loops have been replaced by "while" loops.

In Algol W, the condition of a "while" loop can be a block and the boolean "and" operator short circuits, which allow us to avoid the goto statements.

Also, the Algol W string type is fixed length, unlike the Simula text type.

BEGIN
INTEGER WIDTH, YEAR;
STRING(2) ARRAY WDAYS (0::6);
RECORD MONTH ( STRING(9) MNAME; INTEGER DAYS, START_WDAY, AT_POS );
REFERENCE(MONTH) ARRAY MONTHS(0::11);
WIDTH := 80; YEAR := 1969;

BEGIN
WDAYS(0) := "Su"; WDAYS(1) := "Mo"; WDAYS(2) := "Tu";
WDAYS(3) := "We"; WDAYS(4) := "Th"; WDAYS(5) := "Fr"; WDAYS(6) := "Sa";
MONTHS( 0) := MONTH(" January",  31, 0, 0 );
MONTHS( 1) := MONTH(" February", 28, 0, 0 );
MONTHS( 2) := MONTH("  March",   31, 0, 0 );
MONTHS( 3) := MONTH("  April",   30, 0, 0 );
MONTHS( 4) := MONTH("   May",    31, 0, 0 );
MONTHS( 5) := MONTH("   June",   30, 0, 0 );
MONTHS( 6) := MONTH("   July",   31, 0, 0 );
MONTHS( 7) := MONTH("  August",  31, 0, 0 );
MONTHS( 8) := MONTH("September", 30, 0, 0 );
MONTHS( 9) := MONTH(" October",  31, 0, 0 );
MONTHS(10) := MONTH(" November", 30, 0, 0 );
MONTHS(11) := MONTH(" December", 31, 0, 0 )
END;

BEGIN

PROCEDURE SPACE(INTEGER VALUE N);
BEGIN
WHILE N > 0 DO BEGIN
WRITEON(" "); N := N-1;
END
END SPACE;

PROCEDURE INIT_MONTHS;
BEGIN
INTEGER I;

IF YEAR REM 4 = 0 AND YEAR REM 100 NOT = 0 OR YEAR REM 400 = 0 THEN
DAYS(MONTHS(1)) := 29;

YEAR := YEAR-1;
START_WDAY(MONTHS(0))
:= (YEAR * 365 + YEAR DIV 4 - YEAR DIV 100 + YEAR DIV 400 + 1) REM 7;

FOR I := 1 STEP 1 UNTIL 12-1 DO
START_WDAY(MONTHS(I)) :=
(START_WDAY(MONTHS(I-1)) + DAYS(MONTHS(I-1))) REM 7;

COLS := (WIDTH + 2) DIV 22;
WHILE 12 REM COLS NOT = 0 DO
COLS := COLS-1;
GAP := IF COLS - 1 NOT = 0 THEN (WIDTH - 20 * COLS) DIV (COLS - 1) ELSE 0;
IF GAP > 4 THEN
GAP := 4;
LEAD := (WIDTH - (20 + GAP) * COLS + GAP + 1) DIV 2;
YEAR := YEAR+1
END INIT_MONTHS;

PROCEDURE PRINT_ROW(INTEGER VALUE ROW);
BEGIN
INTEGER C, I, FROM, UP_TO;
INTEGER PROCEDURE PREINCREMENT(INTEGER VALUE RESULT I);
BEGIN I := I+1; I
END PREINCREMENT;
INTEGER PROCEDURE POSTINCREMENT(INTEGER VALUE RESULT I);
BEGIN INTEGER PREV_VALUE;
PREV_VALUE := I; I := I+1; PREV_VALUE
END POSTINCREMENT;
FROM := ROW * COLS;
UP_TO := FROM + COLS;
FOR C := FROM STEP 1 UNTIL UP_TO-1 DO BEGIN
I := 9 % LENGTH OF MNAME(MONTHS(C)) % ;
SPACE((20 - I) DIV 2);
WRITEON(MNAME(MONTHS(C)));
SPACE(20 - I - (20 - I) DIV 2 + (IF C = UP_TO - 1 THEN 0 ELSE GAP));
END;
WRITE();

FOR C := FROM STEP 1 UNTIL UP_TO-1 DO BEGIN
FOR I := 0 STEP 1 UNTIL 7-1 DO BEGIN
WRITEON(WDAYS(I)); IF I NOT = 6 THEN WRITEON(" ")
END;
IF C < UP_TO - 1 THEN
SPACE(GAP)
ELSE
WRITE();
END;
WHILE BEGIN
C := FROM;
WHILE C < UP_TO AND AT_POS(MONTHS(C)) >= DAYS(MONTHS(C)) DO
C := C + 1;

C NOT = UP_TO
END DO BEGIN

C := FROM;
WHILE C < UP_TO DO BEGIN
I := 0;
WHILE I < START_WDAY(MONTHS(C)) DO BEGIN
I := I + 1;
SPACE(3)
END;
WHILE POSTINCREMENT(I) < 7 AND AT_POS(MONTHS(C)) < DAYS(MONTHS(C)) DO BEGIN
WRITEON(I_W := 2, S_W := 0, PREINCREMENT(AT_POS(MONTHS(C))));
IF I < 7 OR C < UP_TO - 1 THEN
SPACE(1)
END;
WHILE POSTINCREMENT(I) <= 7 AND C < UP_TO-1 DO
SPACE(3);
IF C < UP_TO - 1 THEN
SPACE(GAP - 1);
START_WDAY(MONTHS(C)) := 0;
C := C + 1
END;
WRITE();
END;
WRITE()
END PRINT_ROW;

PROCEDURE PRINT_YEAR;
BEGIN
INTEGER ROW, STRLEN, Y;
STRLEN := 1;
Y      := YEAR;
WHILE Y > 9 DO BEGIN Y := Y DIV 10; STRLEN := STRLEN + 1 END;
SPACE((WIDTH - STRLEN) DIV 2);
WRITEON(I_W := 1, YEAR);
WRITE(); WRITE();
WHILE ROW * COLS < 12 DO BEGIN
PRINT_ROW(ROW);
ROW := ROW+1
END
END PRINT_YEAR;

INIT_MONTHS;
PRINT_YEAR
END
END.


{{out}}



1969

January                 February                 March
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1                       1
5  6  7  8  9 10 11     2  3  4  5  6  7  8     2  3  4  5  6  7  8
12 13 14 15 16 17 18     9 10 11 12 13 14 15     9 10 11 12 13 14 15
19 20 21 22 23 24 25    16 17 18 19 20 21 22    16 17 18 19 20 21 22
26 27 28 29 30 31       23 24 25 26 27 28       23 24 25 26 27 28 29
30 31

April                    May                     June
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                 1  2  3     1  2  3  4  5  6  7
6  7  8  9 10 11 12     4  5  6  7  8  9 10     8  9 10 11 12 13 14
13 14 15 16 17 18 19    11 12 13 14 15 16 17    15 16 17 18 19 20 21
20 21 22 23 24 25 26    18 19 20 21 22 23 24    22 23 24 25 26 27 28
27 28 29 30             25 26 27 28 29 30 31    29 30

July                   August                September
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                    1  2        1  2  3  4  5  6
6  7  8  9 10 11 12     3  4  5  6  7  8  9     7  8  9 10 11 12 13
13 14 15 16 17 18 19    10 11 12 13 14 15 16    14 15 16 17 18 19 20
20 21 22 23 24 25 26    17 18 19 20 21 22 23    21 22 23 24 25 26 27
27 28 29 30 31          24 25 26 27 28 29 30    28 29 30
31

October                 November                December
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1        1  2  3  4  5  6
5  6  7  8  9 10 11     2  3  4  5  6  7  8     7  8  9 10 11 12 13
12 13 14 15 16 17 18     9 10 11 12 13 14 15    14 15 16 17 18 19 20
19 20 21 22 23 24 25    16 17 18 19 20 21 22    21 22 23 24 25 26 27
26 27 28 29 30 31       23 24 25 26 27 28 29    28 29 30 31
30



## AutoHotkey

Calendar(Yr){
LastDay := [], Day := []
Titles =
(ltrim
______January_________________February_________________March_______
_______April____________________May____________________June________
________July___________________August_________________September_____
______October_________________November________________December______
)
StringSplit, title, titles, n
Res := "________________________________" Yr "rn"

loop 4 {										; 4 Vertical Sections
Day[1]:=Yr SubStr("0" A_Index*3 -2, -1) 01
Day[2]:=Yr SubStr("0" A_Index*3 -1, -1) 01
Day[3]:=Yr SubStr("0" A_Index*3   , -1) 01
Res .= "rn" title%A_Index% "rnSu Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa"
loop , 6 {									; 6 Weeks max per month
Week := A_Index, Res .= "rn"
loop, 21 {								; 3 weeks times 7 days
Mon := Ceil(A_Index/7), ThisWD := Mod(A_Index-1,7)+1
FormatTime, WD, % Day[Mon], WDay
FormatTime, dd, % Day[Mon], dd
if (WD>ThisWD) {
Res .= "__ "
continue
}
dd := ((Week>3) && dd <10) ? "__" : dd, Res .= dd " ", LastDay[Mon] := Day[Mon], Day[Mon] +=1, Days
Res .= ((wd=7) && A_Index < 21) ? "___" : ""
FormatTime, dd, % Day[Mon], dd
}
}
Res .= "rn"
}
StringReplace, Res, Res,_,%A_Space%, all
Res:=RegExReplace(Res,"am)(^|\s)\K0", " ")
return res
}


Examples:

Gui, font,s8, COURIER
Gui, add, edit, vYr w40 r1 Limit4 Number, 1969
Gui, add, edit, vEdit2 w580 r38
Gui, Add, Button, Default Hidden gSubmit
Gui, show

Submit:
Gui, Submit, NoHide
GuiControl,, Edit2, % Calendar(Yr)
return

GuiEscape:
GuiClose:
ExitApp
return


Outputs:

                                1969

January                February                  March
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1                       1
5  6  7  8  9 10 11     2  3  4  5  6  7  8     2  3  4  5  6  7  8
12 13 14 15 16 17 18     9 10 11 12 13 14 15     9 10 11 12 13 14 15
19 20 21 22 23 24 25    16 17 18 19 20 21 22    16 17 18 19 20 21 22
26 27 28 29 30 31       23 24 25 26 27 28       23 24 25 26 27 28 29
30 31

April                    May                    June
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                 1  2  3     1  2  3  4  5  6  7
6  7  8  9 10 11 12     4  5  6  7  8  9 10     8  9 10 11 12 13 14
13 14 15 16 17 18 19    11 12 13 14 15 16 17    15 16 17 18 19 20 21
20 21 22 23 24 25 26    18 19 20 21 22 23 24    22 23 24 25 26 27 28
27 28 29 30             25 26 27 28 29 30 31    29 30

July                   August                 September
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                    1  2        1  2  3  4  5  6
6  7  8  9 10 11 12     3  4  5  6  7  8  9     7  8  9 10 11 12 13
13 14 15 16 17 18 19    10 11 12 13 14 15 16    14 15 16 17 18 19 20
20 21 22 23 24 25 26    17 18 19 20 21 22 23    21 22 23 24 25 26 27
27 28 29 30 31          24 25 26 27 28 29 30    28 29 30
31

October                November                December
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1        1  2  3  4  5  6
5  6  7  8  9 10 11     2  3  4  5  6  7  8     7  8  9 10 11 12 13
12 13 14 15 16 17 18     9 10 11 12 13 14 15    14 15 16 17 18 19 20
19 20 21 22 23 24 25    16 17 18 19 20 21 22    21 22 23 24 25 26 27
26 27 28 29 30 31       23 24 25 26 27 28 29    28 29 30 31
30


## AutoIt


#include <Date.au3>

; Set the count of characters in each line, minimum is 20 - one month.
Global $iPrintSize = 132 ; Set the count of months, you want to print side by side. With "0" it calculates automatically. ; The number will corrected, if it not allowed to print in an rectangle. ; If your print size is to small for given count, it will set back to automatically calculation. Global$iSideBySide = 3

; Set the count of spaces between months.
Global $iSpace = 4 _CreateCalendar( 1969 ) Func _CreateCalendar($_iYear)
Local $aMon[12] = [' January ', ' February ', ' March ', _ ' April ', ' May ', ' June ', _ ' July ', ' August ', ' September ', _ ' October ', ' November ', ' December '] Local$sHead = 'Mo Tu We Th Fr Sa Su'
Local $aDaysInMonth[12] = [31,28,31,30,31,30,31,31,30,31,30,31] If _DateIsLeapYear($_iYear) Then $aDaysInMonth[1] = 29 ; == assign date in weekday table for the whole year Local$aAllDaysInMonth[6][7][12]   ; [ lines ][ weekdays ][ months ]
Local $iDay = 1,$iShift
For $i = 1 To 12$iShift = _DateToDayOfWeekISO($_iYear,$i, 1) -1
For $j = 0 To 5 For$k = $iShift To 6$aAllDaysInMonth[$j][$k][$i-1] =$iDay
$iDay += 1 If$iDay > $aDaysInMonth[$i-1] Then ExitLoop(2)
Next
$iShift = 0 Next$iDay = 1
Next

; == check given side by side count, calculate if needed
If $iSideBySide > 0 Then If$iPrintSize < ($iSideBySide *(20 +$iSpace) -$iSpace) Then$iSideBySide = 0
EndIf
Switch $iSideBySide Case 0$iSideBySide = Int($iPrintSize /(20 +$iSpace))
If $iPrintSize < 20 Then Return _PrintLine('Escape: Size Error') If$iPrintSize < (20 +$iSpace) Then$iSideBySide = 1
Case 5
$iSideBySide = 4 Case 7 To 11$iSideBySide = 6
EndSwitch

; == create space string
Local $sSpace = '' For$i = 1 To $iSpace$sSpace &= ' '
Next

_PrintLine(@LF)
_PrintLine('[ here is Snoopy ]', @LF)
_PrintLine(StringRegExpReplace($_iYear, '(\d)(\d)(\d)(\d)', '$1 $2$3 $4'), @LF) ; == create data for each line, in dependence to count of months in one line Local$sLine, $iRight,$sTmp1, $sTmp2 For$n = 0 To 12 /$iSideBySide -1$sTmp1 = ''
$sTmp2 = '' For$z = 0 To $iSideBySide -1$sTmp1 &= $aMon[$iSideBySide *$n+$z] & $sSpace$sTmp2 &= $sHead &$sSpace
Next
_PrintLine(StringTrimRight($sTmp1,$iSpace))
_PrintLine(StringTrimRight($sTmp2,$iSpace))
For $j = 0 To 5$sLine = ''
For $i = 1 To$iSideBySide
For $k = 0 To 6$iRight = 3
If $k = 0 Then$iRight = 2
$sLine &= StringRight(' ' &$aAllDaysInMonth[$j][$k][$iSideBySide*$n+$i-1],$iRight)
Next
If $i <$iSideBySide Then $sLine &=$sSpace
Next
_PrintLine($sLine) Next Next EndFunc ;==>_CreateCalendar Func _PrintLine($_sLine, $_sLF='') Local$iLen = StringLen($_sLine) Local$sSpace = '', $sLeft = '' For$i = 1 To $iPrintSize-1$sSpace &= ' '
Next
If $iLen <$iPrintSize Then $sLeft = StringLeft($sSpace, Int(($iPrintSize-$iLen)/2))
ConsoleWrite($sLeft &$_sLine & $_sLF & @LF) EndFunc ;==>_PrintLine  Output  [ here is Snoopy ] 1 9 6 9 January February March Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 1 2 1 2 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 31 April May June Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 1 2 3 4 1 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 30 July August September Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 October November December Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 1 2 1 2 3 4 5 6 7 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31  --[[User:BugFix|BugFix]] ([[User talk:BugFix|talk]]) 00:40, 15 November 2013 (UTC) ## AWK  Works with Gnu awk version 3.1.5 and with BusyBox v1.20.0.git awk To change the output width, change the value assigned to variable pagewide #!/bin/gawk -f BEGIN{ wkdays = "Su Mo Tu We Th Fr Sa" pagewide = 80 blank=" " for (i=1; i<pagewide; i++) blank = blank " " # month name accessed as substr(month,num*10,10) # where num is number of month, 1-12 month= " January February March April " month= month " May June July August " month= month " September October November December " # table of days per month accessed as substr(days,2*month,2) days =" 312831303130313130313031" line1 = "" line2 = "" line3 = "" line4 = "" line5 = "" line6 = "" line7 = "" line8 = "" # print " year: " year " starts on: " dow(year) } function center(text, half) { half = (pagewide - length(text))/2 return substr(blank,1,half) text substr(blank,1,half) } function min(a,b) { if (a < b) return a else return b } function makewk (fst,lst,day, i,wstring ){ wstring="" for (i=1;i<day;i++) wstring=wstring " " for (i=fst;i<=lst;i++) wstring=wstring sprintf("%2d ",i) return substr(wstring " ",1,20) } function dow (year, y){ y=year y= (y*365+int(y/4) - int(y/100) + int(y/400) +1) %7 # leap year adjustment leap = 0 if (year % 4 == 0) leap = 1 if (year % 100 == 0) leap = 0 if (year % 400 == 0) leap = 1 y = y - leap if (y==-1) y=6 if (y==0) y=7 return (y) } function prmonth (nmonth, newdow,monsize ){ line1 = line1 " " (substr(month,10*nmonth,10)) " " line2 = line2 (wkdays) " " line3 = line3 (makewk(1,8-newdow,newdow)) " " line4 = line4 (makewk(9-newdow,15-newdow,1)) " " line5 = line5 (makewk(16-newdow,22-newdow,1)) " " line6 = line6 (makewk(23-newdow,29-newdow,1)) " " line7 = line7 (makewk(30-newdow,min(monsize,36-newdow),1)) " " line8 = line8 (makewk(37-newdow,monsize,1)) " " if (length(line3) + 22 > pagewide) { print center(line1) print center(line2) print center(line3) print center(line4) print center(line5) print center(line6) print center(line7) print center(line8) line1 = "" line2 = "" line3 = "" line4 = "" line5 = "" line6 = "" line7 = "" line8 = "" } } /q/{ exit } { monsize=substr(days,2*1,2) newdow=dow($1)
print center("[ picture of Snoopy goes here ]")
print center(sprintf("%d",$1) ) # January - December for (i=1; i<13; i++) { prmonth(i,newdow,monsize) newdow=(monsize+newdow) %7 if (newdow == 0) newdow = 7 monsize=substr(days,2+2*i,2) if (leap == 1 && monsize == 28) monsize = 29 } }  Output:  [ picture of Snoopy goes here ] 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## BaCon Choosing 132 character output. DECLARE month$[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }
DECLARE month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
year$= "1969" ' Leap year INCR month[1], IIF(MOD(VAL(year$), 4) = 0 OR MOD(VAL(year$), 100) = 0 AND MOD(VAL(year$), 400) <> 0, 1, 0)
PRINT ALIGN$("[SNOOPY HERE]", 132, 2) PRINT ALIGN$(year$, 132, 2) FOR nr = 0 TO 11 row = 3 GOTOXY 1+(nr %6)*22, row+(nr/6)*9 PRINT ALIGN$(month$[nr], 21, 2); INCR row GOTOXY 1+(nr %6)*22, row+(nr/6)*9 PRINT ALIGN$("Mo Tu We Th Fr Sa Su", 21, 2);
INCR row
' Each day
FOR day = 1 TO month[nr]
' Zeller
J = VAL(LEFT$(year$, 2))
K = VAL(MID$(year$, 3, 2))
m = nr+1
IF nr < 2 THEN
INCR m, 12
DECR K
END IF
h = (day + ((m+1)*26)/10 + K + (K/4) + (J/4) + 5*J)
daynr = MOD(h, 7) - 2
IF daynr < 0 THEN INCR daynr, 7
IF daynr = 0 AND day > 1 THEN INCR row
GOTOXY 1+(nr %6)*22+daynr*3, row+(nr/6)*9
PRINT day;
NEXT
NEXT


{{out}}

                                                           [SNOOPY HERE]
1969
January              February                March                 April                  May                  June
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5                  1  2                  1  2      1  2  3  4  5  6            1  2  3  4                     1
6  7  8  9  10 11 12  3  4  5  6  7  8  9   3  4  5  6  7  8  9   7  8  9  10 11 12 13  5  6  7  8  9  10 11  2  3  4  5  6  7  8
13 14 15 16 17 18 19  10 11 12 13 14 15 16  10 11 12 13 14 15 16  14 15 16 17 18 19 20  12 13 14 15 16 17 18  9  10 11 12 13 14 15
20 21 22 23 24 25 26  17 18 19 20 21 22 23  17 18 19 20 21 22 23  21 22 23 24 25 26 27  19 20 21 22 23 24 25  16 17 18 19 20 21 22
27 28 29 30 31        24 25 26 27 28        24 25 26 27 28 29 30  28 29 30              26 27 28 29 30 31     23 24 25 26 27 28 29
31                                                                30

July                 August               September              October              November              December
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5  6               1  2  3   1  2  3  4  5  6  7         1  2  3  4  5                  1  2   1  2  3  4  5  6  7
7  8  9  10 11 12 13  4  5  6  7  8  9  10  8  9  10 11 12 13 14  6  7  8  9  10 11 12  3  4  5  6  7  8  9   8  9  10 11 12 13 14
14 15 16 17 18 19 20  11 12 13 14 15 16 17  15 16 17 18 19 20 21  13 14 15 16 17 18 19  10 11 12 13 14 15 16  15 16 17 18 19 20 21
21 22 23 24 25 26 27  18 19 20 21 22 23 24  22 23 24 25 26 27 28  20 21 22 23 24 25 26  17 18 19 20 21 22 23  22 23 24 25 26 27 28
28 29 30 31           25 26 27 28 29 30 31  29 30                 27 28 29 30 31        24 25 26 27 28 29 30  29 30 31



## Batch File

::Calender Task from Rosetta Code Wiki
::Batch File Implementation

@echo off
setlocal enabledelayedexpansion

%== Set a valid year [will not be validated] ==%
set y=1969

%== Set the variables for months (feb_l=the normal 28 days) ==%
set jan_l=31&set apr_l=30
set mar_l=31&set jun_l=30
set may_l=31&set sep_l=30
set jul_l=31&set nov_l=30
set aug_l=31&set feb_l=28
set oct_l=31
set dec_l=31

%== Compute day for first day of the year ==%
set /a d=(y/4+y)-(y/100-y/400)

%== Check if that year is a leap year ==%
set /a "op1=y%%4","op2=y%%100","op3=y%%400"
if not "%op1%"=="0" (goto :no_leap)
if not "%op2%"=="0" (goto :yes_leap)
if not "%op3%"=="0" (goto :no_leap)
:yes_leap
%== Ooops... Leap year. Change feb_l to 29. ==%
set feb_l=29
set/a d-=1
:no_leap

%== Compute weekday of the first day... ==%
set /a d%%=7

%== Generate everything that's inside the calendar ==%
for %%a in (jan feb mar apr may jun jul aug sep oct nov dec) do (
set %%a=
for /l %%b in (1,1,!d!) do (set "%%a=!%%a!   "&set /a chars_added+=3)
for /l %%c in (1,1,!%%a_l!) do (
if %%c lss 10 (set "%%a=!%%a! %%c ") else (set "%%a=!%%a!%%c ")
)
for /l %%d in (!chars_added!,1,124) do set "%%a=!%%a! "
set /a d=^(d+%%a_l^)%%7
)

%== Display the calendar ==%
cls
echo.
echo.                              [SNOOPY]
echo.
echo. YEAR = %y%
echo.
echo.       January                February                March
echo. Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
echo. %jan:~0,20%   %feb:~0,20%   %mar:~0,20%
echo. %jan:~21,20%   %feb:~21,20%   %mar:~21,20%
echo. %jan:~42,20%   %feb:~42,20%   %mar:~42,20%
echo. %jan:~63,20%   %feb:~63,20%   %mar:~63,20%
echo. %jan:~84,20%   %feb:~84,20%   %mar:~84,20%
echo. %jan:~105%   %feb:~105%   %mar:~105%
echo.
echo.        April                   May                    June
echo. Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
echo. %apr:~0,20%   %may:~0,20%   %jun:~0,20%
echo. %apr:~21,20%   %may:~21,20%   %jun:~21,20%
echo. %apr:~42,20%   %may:~42,20%   %jun:~42,20%
echo. %apr:~63,20%   %may:~63,20%   %jun:~63,20%
echo. %apr:~84,20%   %may:~84,20%   %jun:~84,20%
echo. %apr:~105%   %may:~105%   %jun:~105%
echo.
echo.         July                  August                September
echo. Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
echo. %jul:~0,20%   %aug:~0,20%   %sep:~0,20%
echo. %jul:~21,20%   %aug:~21,20%   %sep:~21,20%
echo. %jul:~42,20%   %aug:~42,20%   %sep:~42,20%
echo. %jul:~63,20%   %aug:~63,20%   %sep:~63,20%
echo. %jul:~84,20%   %aug:~84,20%   %sep:~84,20%
echo. %jul:~105%   %aug:~105%   %sep:~105%
echo.
echo.       October                November               December
echo. Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
echo. %oct:~0,20%   %nov:~0,20%   %dec:~0,20%
echo. %oct:~21,20%   %nov:~21,20%   %dec:~21,20%
echo. %oct:~42,20%   %nov:~42,20%   %dec:~42,20%
echo. %oct:~63,20%   %nov:~63,20%   %dec:~63,20%
echo. %oct:~84,20%   %nov:~84,20%   %dec:~84,20%
echo. %oct:~105%   %nov:~105%   %dec:~105%
echo.
pause
endlocal


{{Out}}



[SNOOPY]

YEAR = 1969

January                February                March
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1                      1
5  6  7  8  9 10 11    2  3  4  5  6  7  8    2  3  4  5  6  7  8
12 13 14 15 16 17 18    9 10 11 12 13 14 15    9 10 11 12 13 14 15
19 20 21 22 23 24 25   16 17 18 19 20 21 22   16 17 18 19 20 21 22
26 27 28 29 30 31      23 24 25 26 27 28      23 24 25 26 27 28 29
30 31

April                   May                    June
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                1  2  3    1  2  3  4  5  6  7
6  7  8  9 10 11 12    4  5  6  7  8  9 10    8  9 10 11 12 13 14
13 14 15 16 17 18 19   11 12 13 14 15 16 17   15 16 17 18 19 20 21
20 21 22 23 24 25 26   18 19 20 21 22 23 24   22 23 24 25 26 27 28
27 28 29 30            25 26 27 28 29 30 31   29 30

July                  August                September
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                   1  2       1  2  3  4  5  6
6  7  8  9 10 11 12    3  4  5  6  7  8  9    7  8  9 10 11 12 13
13 14 15 16 17 18 19   10 11 12 13 14 15 16   14 15 16 17 18 19 20
20 21 22 23 24 25 26   17 18 19 20 21 22 23   21 22 23 24 25 26 27
27 28 29 30 31         24 25 26 27 28 29 30   28 29 30
31

October                November               December
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1       1  2  3  4  5  6
5  6  7  8  9 10 11    2  3  4  5  6  7  8    7  8  9 10 11 12 13
12 13 14 15 16 17 18    9 10 11 12 13 14 15   14 15 16 17 18 19 20
19 20 21 22 23 24 25   16 17 18 19 20 21 22   21 22 23 24 25 26 27
26 27 28 29 30 31      23 24 25 26 27 28 29   28 29 30 31
30

Press any key to continue . . .


## BBC BASIC

{{works with|BBC BASIC for Windows}} The day and month names are in the language for which the PC is configured.

      INSTALL @lib$+"DATELIB" VDU 23,22,640;570;8,15,16,128 year% = 1969 PRINT TAB(38); year% DIM dom%(2), mjd%(2), dim%(2) FOR day% = 1 TO 7 days$ += LEFT$(FN_date$(FN_mjd(day%, 1, 1905), "ddd"), 2) + " "
NEXT

FOR month% = 1 TO 10 STEP 3
PRINT
FOR col% = 0 TO 2
mjd%(col%) = FN_mjd(1, month% + col%, year%)
month$= FN_date$(mjd%(col%), "MMMM")
PRINT TAB(col%*24 + 16 - LEN(month$)/2) month$;
NEXT
FOR col% = 0 TO 2
PRINT TAB(col%*24 + 6) days$; dim%(col%) = FN_dim(month% + col%, year%) NEXT dom%() = 1 col% = 0 REPEAT dow% = FN_dow(mjd%(col%)) IF dom%(col%)<=dim%(col%) THEN PRINT TAB(col%*24 + dow%*3 + 6); dom%(col%); dom%(col%) += 1 mjd%(col%) += 1 ENDIF IF dow%=6 OR dom%(col%)>dim%(col%) col% = (col% + 1) MOD 3 UNTIL dom%(0)>dim%(0) AND dom%(1)>dim%(1) AND dom%(2)>dim%(2) PRINT NEXT  Output:  1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Befunge This is quite closely based on the [[Calendar#C|C]] sample, although the centering calculation has been adjusted to fix an off-by-one error, and the months have been made a constant height, regardless of how much space they require, to try and produce a more balanced layout. The year is read from stdin, and the width is specified by the first value on the stack (set to 80 - "P" - in the current implementation). "P"00p&>:::4%!\"d"%*\45*:*%!+!!65*+31p:1-:::"I"5**\4/+\"d"/-\45*:*/+1+7%:0v J!F?M!A M!J J!A!S O!N D!SaFrThWeTuMoSuvp01:_1#!-#%:#\>#+6<v-2g1+1g01p1p01:< January February March April >:45**00g\-\1-:v:<<6>+7%:10g2+:38*\| May June July August v02-1:+4*-4\\4:/_$:^^:/*2+92+2:g00$$< September October November December>p:45*+10g*\--2/00g4-2/>:#,1#*-#8\#4_v >20g>:#,1#*-#8\#4_6"S" v. .vp040\_4#!8#\*#-,#1>#:<+5g03g01:,,:+55<0.p03< ^_v#:-1_v#!:,*84,g1+1,< < ^ >::4%9*40g:8!#v_$$$1+v^+g02_#v$#,$#+5<^_v#\< -#8\#4_$7>1-:2*64*+:1g>^ ^   ^,g+2/4\+p04+1:<>1#\-#<:66+\^ >>$10g30g>:#,1#* > > $$55+,6>>40p:10g30g>:#,1#*-#8\#4_>\:2*:1+1g2-50p1g640g-7*1+\-7v v@,<6 2:+g01_55+,^ > > > > #^>#g>#0>#2_v v*2!!\%+55:\/+55:**0\!g05:::\< >2-^^ ->:> >#^>#<>#<^#!:-1g04$$ < < < < < >4+8*+\:!!2*4+8*+,,48*,1+\1-:>#^_$1+\1  ## C With arbitrary display width (>= 20 though) and auto spacing. #include <stdio.h> #include <stdlib.h> #include <string.h> int width = 80, year = 1969; int cols, lead, gap; const char *wdays[] = { "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa" }; struct months { const char *name; int days, start_wday, at; } months[12] = { { "January", 31, 0, 0 }, { "February", 28, 0, 0 }, { "March", 31, 0, 0 }, { "April", 30, 0, 0 }, { "May", 31, 0, 0 }, { "June", 30, 0, 0 }, { "July", 31, 0, 0 }, { "August", 31, 0, 0 }, { "September", 30, 0, 0 }, { "October", 31, 0, 0 }, { "November", 30, 0, 0 }, { "December", 31, 0, 0 } }; void space(int n) { while (n-- > 0) putchar(' '); } void init_months() { int i; if ((!(year % 4) && (year % 100)) || !(year % 400)) months[1].days = 29; year--; months[0].start_wday = (year * 365 + year/4 - year/100 + year/400 + 1) % 7; for (i = 1; i < 12; i++) months[i].start_wday = (months[i-1].start_wday + months[i-1].days) % 7; cols = (width + 2) / 22; while (12 % cols) cols--; gap = cols - 1 ? (width - 20 * cols) / (cols - 1) : 0; if (gap > 4) gap = 4; lead = (width - (20 + gap) * cols + gap + 1) / 2; year++; } void print_row(int row) { int c, i, from = row * cols, to = from + cols; space(lead); for (c = from; c < to; c++) { i = strlen(months[c].name); space((20 - i)/2); printf("%s", months[c].name); space(20 - i - (20 - i)/2 + ((c == to - 1) ? 0 : gap)); } putchar('\n'); space(lead); for (c = from; c < to; c++) { for (i = 0; i < 7; i++) printf("%s%s", wdays[i], i == 6 ? "" : " "); if (c < to - 1) space(gap); else putchar('\n'); } while (1) { for (c = from; c < to; c++) if (months[c].at < months[c].days) break; if (c == to) break; space(lead); for (c = from; c < to; c++) { for (i = 0; i < months[c].start_wday; i++) space(3); while(i++ < 7 && months[c].at < months[c].days) { printf("%2d", ++months[c].at); if (i < 7 || c < to - 1) putchar(' '); } while (i++ <= 7 && c < to - 1) space(3); if (c < to - 1) space(gap - 1); months[c].start_wday = 0; } putchar('\n'); } putchar('\n'); } void print_year() { int row; char buf[32]; sprintf(buf, "%d", year); space((width - strlen(buf)) / 2); printf("%s\n\n", buf); for (row = 0; row * cols < 12; row++) print_row(row); } int main(int c, char **v) { int i, year_set = 0; for (i = 1; i < c; i++) { if (!strcmp(v[i], "-w")) { if (++i == c || (width = atoi(v[i])) < 20) goto bail; } else if (!year_set) { if (!sscanf(v[i], "%d", &year) || year <= 0) year = 1969; year_set = 1; } else goto bail; } init_months(); print_year(); return 0; bail: fprintf(stderr, "bad args\nUsage: %s year [-w width (>= 20)]\n", v[0]); exit(1); }  ## C++  #include <windows.h> #include <iostream> //-------------------------------------------------------------------------------------------------- using namespace std; //-------------------------------------------------------------------------------------------------- class calender { public: void drawCalender( int y ) { year = y; for( int i = 0; i < 12; i++ ) firstdays[i] = getfirstday( i ); isleapyear(); build(); } private: void isleapyear() { isleap = false; if( !( year % 4 ) ) { if( year % 100 ) isleap = true; else if( !( year % 400 ) ) isleap = true; } } int getfirstday( int m ) { int y = year; int f = y + 1 + 3 * m - 1; m++; if( m < 3 ) y--; else f -= int( .4 * m + 2.3 ); f += int( y / 4 ) - int( ( y / 100 + 1 ) * 0.75 ); f %= 7; return f; } void build() { int days[] = { 31, isleap ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; int lc = 0, lco = 0, ystr = 7, start = 2, fd = 0, m = 0; HANDLE h = GetStdHandle( STD_OUTPUT_HANDLE ); COORD pos = { 0, ystr }; draw(); for( int i = 0; i < 4; i++ ) { for( int j = 0; j < 3; j++ ) { int d = firstdays[fd++], dm = days[m++]; pos.X = d * 3 + start; SetConsoleCursorPosition( h, pos ); for( int dd = 0; dd < dm; dd++ ) { if( dd < 9 ) cout << 0 << dd + 1 << " "; else cout << dd + 1 << " "; pos.X += 3; if( pos.X - start > 20 ) { pos.X = start; pos.Y++; SetConsoleCursorPosition( h, pos ); } } start += 23; pos.X = start; pos.Y = ystr; SetConsoleCursorPosition( h, pos ); } ystr += 9; start = 2; pos.Y = ystr; } } void draw() { system( "cls" ); cout << "+--------------------------------------------------------------------+" << endl; cout << "| [SNOOPY] |" << endl; cout << "| |" << endl; cout << "| == " << year << " == |" << endl; cout << "+----------------------+----------------------+----------------------+" << endl; cout << "| JANUARY | FEBRUARY | MARCH |" << endl; cout << "| SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "+----------------------+----------------------+----------------------+" << endl; cout << "| APRIL | MAY | JUNE |" << endl; cout << "| SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "+----------------------+----------------------+----------------------+" << endl; cout << "| JULY | AUGUST | SEPTEMBER |" << endl; cout << "| SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "+----------------------+----------------------+----------------------+" << endl; cout << "| OCTOBER | NOVEMBER | DECEMBER |" << endl; cout << "| SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "| | | |" << endl; cout << "+----------------------+----------------------+----------------------+" << endl; } int firstdays[12], year; bool isleap; }; //-------------------------------------------------------------------------------------------------- int main( int argc, char* argv[] ) { int y; calender cal; while( true ) { system( "cls" ); cout << "Enter the year( yyyy ) --- ( 0 to quit ): "; cin >> y; if( !y ) return 0; cal.drawCalender( y ); cout << endl << endl << endl << endl << endl << endl << endl << endl; system( "pause" ); } return 0; } //--------------------------------------------------------------------------------------------------  Output:  +--------------------------------------------------------------------+ | [SNOOPY] | | | | == 1969 == | +----------------------+----------------------+----------------------+ | JANUARY | FEBRUARY | MARCH | | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | | 01 02 03 04 | 01 | 01 | | 05 06 07 08 09 10 11 | 02 03 04 05 06 07 08 | 02 03 04 05 06 07 08 | | 12 13 14 15 16 17 18 | 09 10 11 12 13 14 15 | 09 10 11 12 13 14 15 | | 19 20 21 22 23 24 25 | 16 17 18 19 20 21 22 | 16 17 18 19 20 21 22 | | 26 27 28 29 30 31 | 23 24 25 26 27 28 | 23 24 25 26 27 28 29 | | | | 30 31 | +----------------------+----------------------+----------------------+ | APRIL | MAY | JUNE | | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | | 01 02 03 04 05 | 01 02 03 | 01 02 03 04 05 06 07 | | 06 07 08 09 10 11 12 | 04 05 06 07 08 09 10 | 08 09 10 11 12 13 14 | | 13 14 15 16 17 18 19 | 11 12 13 14 15 16 17 | 15 16 17 18 19 20 21 | | 20 21 22 23 24 25 26 | 18 19 20 21 22 23 24 | 22 23 24 25 26 27 28 | | 27 28 29 30 | 25 26 27 28 29 30 31 | 29 30 | | | | | +----------------------+----------------------+----------------------+ | JULY | AUGUST | SEPTEMBER | | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | | 01 02 03 04 05 | 01 02 | 01 02 03 04 05 06 | | 06 07 08 09 10 11 12 | 03 04 05 06 07 08 09 | 07 08 09 10 11 12 13 | | 13 14 15 16 17 18 19 | 10 11 12 13 14 15 16 | 14 15 16 17 18 19 20 | | 20 21 22 23 24 25 26 | 17 18 19 20 21 22 23 | 21 22 23 24 25 26 27 | | 27 28 29 30 31 | 24 25 26 27 28 29 30 | 28 29 30 | | | 31 | | +----------------------+----------------------+----------------------+ | OCTOBER | NOVEMBER | DECEMBER | | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | SU MO TU WE TH FR SA | | 01 02 03 04 | 01 | 01 02 03 04 05 06 | | 05 06 07 08 09 10 11 | 02 03 04 05 06 07 08 | 07 08 09 10 11 12 13 | | 12 13 14 15 16 17 18 | 09 10 11 12 13 14 15 | 14 15 16 17 18 19 20 | | 19 20 21 22 23 24 25 | 16 17 18 19 20 21 22 | 21 22 23 24 25 26 27 | | 26 27 28 29 30 31 | 23 24 25 26 27 28 29 | 28 29 30 31 | | | 30 | | +----------------------+----------------------+----------------------+  ## C# An attempt to abuse the DateTime class for all static information. In the event that the number of days and months changes, so long as the DateTime class is updated accordingly, this should still print properly. It also abuses iterators to allow for a concise month printing method, but with the ability to still print x months per line.  using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace CalendarStuff { class Program { static void Main(string[] args) { Console.WindowHeight = 46; Console.Write(buildMonths(new DateTime(1969, 1, 1))); Console.Read(); } private static string buildMonths(DateTime date) { StringBuilder sb = new StringBuilder(); sb.AppendLine(center("[Snoop]", 24 * 3)); sb.AppendLine(); sb.AppendLine(center(date.Year.ToString(), 24 * 3)); List<DateTime> dts = new List<DateTime>(); while (true) { dts.Add(date); if (date.Year != ((date = date.AddMonths(1)).Year)) { break; } } var jd = dts.Select(a => buildMonth(a).GetEnumerator()).ToArray(); int sCur=0; while (sCur<dts.Count) { sb.AppendLine(); int curMonth=0; var j = jd.Where(a => curMonth++ >= sCur && curMonth - 1 < sCur + 3).ToArray(); //grab the next 3 sCur += j.Length; bool breakOut = false; while (!breakOut) { int inj = 1; foreach (var cd in j) { if (cd.MoveNext()) { sb.Append((cd.Current.Length == 21 ? cd.Current : cd.Current.PadRight(21, ' ')) + " "); } else { sb.Append("".PadRight(21, ' ') + " "); breakOut = true; } if (inj++ % 3 == 0) sb.AppendLine(); } } } return sb.ToString(); } private static IEnumerable<string> buildMonth(DateTime date) { yield return center(date.ToString("MMMM"),7*3); var j = DateTime.DaysInMonth(date.Year, date.Month); yield return Enum.GetNames(typeof(DayOfWeek)).Aggregate("", (current, result) => current + (result.Substring(0, 2).ToUpper() + " ")); string cur = ""; int total = 0; foreach (var day in Enumerable.Range(-((int)date.DayOfWeek),j + (int)date.DayOfWeek)) { cur += (day < 0 ? " " : ((day < 9 ? " " : "") + (day + 1))) +" "; if (total++ > 0 && (total ) % 7 == 0) { yield return cur; cur = ""; } } yield return cur; } private static string center(string s, int len) { return (s.PadLeft((len - s.Length) / 2 + s.Length, ' ').PadRight((len), ' ')); } } }  ## COBOL the program calls subroutine DATE2DOW to convert any YYYY-MM-DD to Day of Week (1=Sunday). the group names WS-CFGN and WS-CFGW may be moved to WS-CFG to use narrow or wide print line size respectively.  IDENTIFICATION DIVISION. PROGRAM-ID. CALEND. ENVIRONMENT DIVISION. INPUT-OUTPUT SECTION. DATA DIVISION. WORKING-STORAGE SECTION. 01 WS-DAY-NAMES-DEF. 03 FILLER PIC X(09) VALUE 'SUNDAY '. 03 FILLER PIC X(09) VALUE 'MONDAY '. 03 FILLER PIC X(09) VALUE 'TUESDAY '. 03 FILLER PIC X(09) VALUE 'WEDNESDAY'. 03 FILLER PIC X(09) VALUE 'THURSDAY '. 03 FILLER PIC X(09) VALUE 'FRIDAY '. 03 FILLER PIC X(09) VALUE 'SATURDAY '. 01 FILLER REDEFINES WS-DAY-NAMES-DEF. 03 WS-DAY-NAME PIC X(09) OCCURS 07 TIMES. 01 WS-MTH-INFO-DEF. 03 FILLER PIC X(11) VALUE 'JANUARY 31'. 03 FILLER PIC X(11) VALUE 'FEBRUARY 28'. 03 FILLER PIC X(11) VALUE 'MARCH 31'. 03 FILLER PIC X(11) VALUE 'APRIL 30'. 03 FILLER PIC X(11) VALUE 'MAY 31'. 03 FILLER PIC X(11) VALUE 'JUNE 30'. 03 FILLER PIC X(11) VALUE 'JULY 31'. 03 FILLER PIC X(11) VALUE 'AUGUST 31'. 03 FILLER PIC X(11) VALUE 'SEPTEMBER30'. 03 FILLER PIC X(11) VALUE 'OCTOBER 31'. 03 FILLER PIC X(11) VALUE 'NOVEMBER 30'. 03 FILLER PIC X(11) VALUE 'DECEMBER 31'. 01 FILLER REDEFINES WS-MTH-INFO-DEF. 03 WS-MTH-INFO-TABLE OCCURS 12 TIMES. 05 WS-MTH-INFO-NAME PIC X(09). 05 WS-MTH-INFO-DAYS PIC 9(02). 01 WS-MTH-AREA. 03 WS-MTH-DD PIC S99. 03 WS-DAY1 PIC 9. 03 WS-DAYS PIC 99. 03 WS-DD PIC 9. 03 WS-WK PIC 9. 03 WS-MM PIC 99. 03 WS-QQ PIC 99. 03 WS-MTH-MONTH OCCURS 12 TIMES. 05 WS-MTH-WEEK OCCURS 6 TIMES. 07 WS-DAY-FLD OCCURS 7 TIMES. 09 WS-DAY PIC ZZ. 01 INPDATE-RECORD. 05 INPD-YEAR PIC 9(04). 05 FILLER PIC X(01). 05 INPD-MONTH PIC 9(02). 05 FILLER PIC X(01). 05 INPD-DAY PIC 9(02). 01 WMS-DOW PIC 9(01). 01 WS-PRT PIC X(132). 01 WS-COL PIC 9(03) VALUE 0. 01 WS-PP PIC 9(03) VALUE 0. 01 WS-CFGN. 03 FILLER PIC 9(03) VALUE 80. 03 FILLER PIC 9(02) VALUE 5. 03 FILLER PIC 9(01) VALUE 1. 03 FILLER PIC 9(02) VALUE 5. 03 FILLER PIC 9(01) VALUE 2. 01 WS-CFGW. 03 FILLER PIC 9(03) VALUE 120. 03 FILLER PIC 9(02) VALUE 10. 03 FILLER PIC 9(01) VALUE 2. 03 FILLER PIC 9(02) VALUE 10. 03 FILLER PIC 9(01) VALUE 3. 01 WS-CFG. 03 WS-LS PIC 9(03) VALUE 120. 03 WS-LMAR PIC 9(02) VALUE 10. 03 WS-SPBD PIC 9(01) VALUE 2. 03 WS-SPBC PIC 9(02) VALUE 10. 03 WS-DNMW PIC 9(01) VALUE 3. PROCEDURE DIVISION. MOVE '1969-01-01' TO INPDATE-RECORD MOVE WS-CFGN TO WS-CFG IF (FUNCTION MOD ( INPD-YEAR , 400 ) = 0 OR (FUNCTION MOD ( INPD-YEAR , 4 ) = 0 AND FUNCTION MOD ( INPD-YEAR , 100 ) NOT = 0)) MOVE 29 TO WS-MTH-INFO-DAYS (02) ELSE MOVE 28 TO WS-MTH-INFO-DAYS (02) END-IF PERFORM VARYING WS-MM FROM 1 BY +1 UNTIL WS-MM > 12 MOVE WS-MM TO INPD-MONTH CALL 'DATE2DOW' USING INPDATE-RECORD, WMS-DOW COMPUTE WS-MTH-DD = 1 - WMS-DOW COMPUTE WS-DAYS = WS-MTH-INFO-DAYS (INPD-MONTH) PERFORM VARYING WS-WK FROM 1 BY +1 UNTIL WS-WK > 6 PERFORM VARYING WS-DD FROM 1 BY +1 UNTIL WS-DD > 7 COMPUTE WS-MTH-DD = WS-MTH-DD + 1 IF (WS-MTH-DD < 1) OR (WS-MTH-DD > WS-DAYS) MOVE 0 TO WS-DAY (WS-MM, WS-WK, WS-DD) ELSE MOVE WS-MTH-DD TO WS-DAY (WS-MM, WS-WK, WS-DD) END-IF END-PERFORM END-PERFORM END-PERFORM COMPUTE WS-MM = 0 PERFORM VARYING WS-QQ FROM 1 BY +1 UNTIL WS-QQ > 4 INITIALIZE WS-PRT COMPUTE WS-PP = 1 PERFORM VARYING WS-COL FROM 1 BY +1 UNTIL WS-COL > 3 COMPUTE WS-MM = 3 * (WS-QQ - 1) + WS-COL IF WS-COL = 1 COMPUTE WS-PP = WS-PP + WS-LMAR + 2 - WS-DNMW ELSE COMPUTE WS-PP = WS-PP + WS-SPBC + 2 - WS-DNMW END-IF MOVE WS-MTH-INFO-NAME (WS-MM) TO WS-PRT(WS-PP:9) COMPUTE WS-PP = WS-PP + ( 2 * 7 + WS-SPBD * 6 + WS-SPBD - 1) - 4 MOVE INPD-YEAR TO WS-PRT (WS-PP:4) COMPUTE WS-PP = WS-PP + 4 END-PERFORM DISPLAY WS-PRT (1:WS-LS) INITIALIZE WS-PRT COMPUTE WS-PP = 1 PERFORM VARYING WS-COL FROM 1 BY +1 UNTIL WS-COL > 3 COMPUTE WS-MM = 3 * (WS-QQ - 1) + WS-COL IF WS-COL = 1 COMPUTE WS-PP = WS-PP + WS-LMAR + 2 - WS-DNMW ELSE COMPUTE WS-PP = WS-PP + WS-SPBC + 2 - WS-DNMW END-IF PERFORM VARYING WS-DD FROM 1 BY +1 UNTIL WS-DD > 7 IF WS-DD > 1 COMPUTE WS-PP = WS-PP + WS-SPBD + 2 - WS-DNMW END-IF MOVE WS-DAY-NAME (WS-DD) (1:WS-DNMW) TO WS-PRT (WS-PP:WS-DNMW) COMPUTE WS-PP = WS-PP + WS-DNMW END-PERFORM END-PERFORM DISPLAY WS-PRT (1:WS-LS) PERFORM VARYING WS-WK FROM 1 BY +1 UNTIL WS-WK > 6 INITIALIZE WS-PRT COMPUTE WS-PP = 1 PERFORM VARYING WS-COL FROM 1 BY +1 UNTIL WS-COL > 3 COMPUTE WS-MM = 3 * (WS-QQ - 1) + WS-COL IF WS-COL = 1 COMPUTE WS-PP = WS-PP + WS-LMAR ELSE COMPUTE WS-PP = WS-PP + WS-SPBC END-IF PERFORM VARYING WS-DD FROM 1 BY +1 UNTIL WS-DD > 7 IF WS-DD > 1 COMPUTE WS-PP = WS-PP + WS-SPBD END-IF MOVE WS-DAY (WS-MM, WS-WK, WS-DD) TO WS-PRT (WS-PP:2) COMPUTE WS-PP = WS-PP + 2 END-PERFORM END-PERFORM DISPLAY WS-PRT (1:WS-LS) END-PERFORM DISPLAY ' ' END-PERFORM GOBACK . END PROGRAM CALEND. IDENTIFICATION DIVISION. PROGRAM-ID. DATE2DOW. ENVIRONMENT DIVISION. DATA DIVISION. WORKING-STORAGE SECTION. 01 WMS-WORK-AREA. 03 WMS-YEAR PIC 9(04). 03 WMS-MONTH PIC 9(02). 03 WMS-CSYS PIC 9(01) VALUE 1. 03 WMS-SUM pic 9(04). LINKAGE SECTION. 01 INPDATE-RECORD. 05 INPD-YEAR PIC 9(04). 05 FILLER PIC X(01). 05 INPD-MONTH PIC 9(02). 05 FILLER PIC X(01). 05 INPD-DAY PIC 9(02). 01 WMS-DOW PIC 9(01). PROCEDURE DIVISION USING INPDATE-RECORD, WMS-DOW. 1010-CONVERT-DATE-TO-DOW. IF INPD-MONTH < 3 COMPUTE WMS-MONTH = INPD-MONTH + 12 COMPUTE WMS-YEAR = INPD-YEAR - 1 ELSE COMPUTE WMS-MONTH = INPD-MONTH COMPUTE WMS-YEAR = INPD-YEAR END-IF COMPUTE WMS-SUM = ( INPD-DAY + 2 * WMS-MONTH + WMS-YEAR + FUNCTION INTEGER (6 * (WMS-MONTH + 1) / 10) + FUNCTION INTEGER ( WMS-YEAR / 4 ) - FUNCTION INTEGER ( WMS-YEAR / 100 ) + FUNCTION INTEGER ( WMS-YEAR / 400 ) + WMS-CSYS ) COMPUTE WMS-DOW = FUNCTION MOD (WMS-SUM, 7) + 1 GOBACK . END PROGRAM DATE2DOW.  Output (based on 80 character wide display)  JANUARY 1969 FEBRUARY 1969 MARCH 1969 SU MO TU WE TH FR SA SU MO TU WE TH FR SA SU MO TU WE TH FR SA 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 APRIL 1969 MAY 1969 JUNE 1969 SU MO TU WE TH FR SA SU MO TU WE TH FR SA SU MO TU WE TH FR SA 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 JULY 1969 AUGUST 1969 SEPTEMBER 1969 SU MO TU WE TH FR SA SU MO TU WE TH FR SA SU MO TU WE TH FR SA 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 OCTOBER 1969 NOVEMBER 1969 DECEMBER 1969 SU MO TU WE TH FR SA SU MO TU WE TH FR SA SU MO TU WE TH FR SA 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Common Lisp Depends on quicklisp. (ql:quickload '(date-calc)) (defparameter *day-row* "Su Mo Tu We Th Fr Sa") (defparameter *calendar-margin* 3) (defun month-to-word (month) "Translate a MONTH from 1 to 12 into its word representation." (svref #("January" "February" "March" "April" "May" "June" "July" "August" "September" "October" "November" "December") (1- month))) (defun month-strings (year month) "Collect all of the strings that make up a calendar for a given MONTH and YEAR." (,(date-calc:center (month-to-word month) (length *day-row*)) ,*day-row* ;; We can assume that a month calendar will always fit into a 7 by 6 block ;; of values. This makes it easy to format the resulting strings. ,@ (let ((days (make-array (* 7 6) :initial-element nil))) (loop :for i :from (date-calc:day-of-week year month 1) :for day :from 1 :to (date-calc:days-in-month year month) :do (setf (aref days i) day)) (loop :for i :from 0 :to 5 :collect (format nil "~{~:[ ~;~2,d~]~^ ~}" (loop :for day :across (subseq days (* i 7) (+ 7 (* i 7))) :append (if day (list day day) (list day)))))))) (defun calc-columns (characters margin-size) "Calculate the number of columns given the number of CHARACTERS per column and the MARGIN-SIZE between them." (multiple-value-bind (cols excess) (truncate characters (+ margin-size (length *day-row*))) (incf excess margin-size) (if (>= excess (length *day-row*)) (1+ cols) cols))) (defun take (n list) "Take the first N elements of a LIST." (loop :repeat n :for x :in list :collect x)) (defun drop (n list) "Drop the first N elements of a LIST." (cond ((or (<= n 0) (null list)) list) (t (drop (1- n) (cdr list))))) (defun chunks-of (n list) "Split the LIST into chunks of size N." (assert (> n 0)) (loop :for x := list :then (drop n x) :while x :collect (take n x))) (defun print-calendar (year &key (characters 80) (margin-size 3)) "Print out the calendar for a given YEAR, optionally specifying a width limit in CHARACTERS and MARGIN-SIZE between months." (assert (>= characters (length *day-row*))) (assert (>= margin-size 0)) (let* ((calendars (loop :for month :from 1 :to 12 :collect (month-strings year month))) (column-count (calc-columns characters margin-size)) (total-size (+ (* column-count (length *day-row*)) (* (1- column-count) margin-size))) (format-string (concatenate 'string "~{~a~^~" (write-to-string margin-size) ",0@T~}~%"))) (format t "~a~%~a~%~%" (date-calc:center "[Snoopy]" total-size) (date-calc:center (write-to-string year) total-size)) (loop :for row :in (chunks-of column-count calendars) :do (apply 'mapcar (lambda (&rest heads) (format t format-string heads)) row))))  {{out}} CL-USER> (print-calendar 1969) [Snoopy] 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 6 7 8 9 10 11 12 4 5 6 7 8 9 10 1 2 3 4 5 6 7 13 14 15 16 17 18 19 11 12 13 14 15 16 17 8 9 10 11 12 13 14 20 21 22 23 24 25 26 18 19 20 21 22 23 24 15 16 17 18 19 20 21 27 28 29 30 25 26 27 28 29 30 31 22 23 24 25 26 27 28 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30 NIL  ## D import std.stdio, std.datetime, std.string, std.conv; void printCalendar(in uint year, in uint nCols) in { assert(nCols > 0 && nCols <= 12); } body { immutable rows = 12 / nCols + (12 % nCols != 0); auto date = Date(year, 1, 1); int offs = date.dayOfWeek; const months = "January February March April May June July August September October November December".split; string[8][12] mons; foreach (immutable m; 0 .. 12) { mons[m][0] = months[m].center(21); mons[m][1] = " Su Mo Tu We Th Fr Sa"; immutable dim = date.daysInMonth; foreach (immutable d; 1 .. 43) { immutable day = d > offs && d <= offs + dim; immutable str = day ? format(" %2s", d-offs) : " "; mons[m][2 + (d - 1) / 7] ~= str; } offs = (offs + dim) % 7; date.add!"months"(1); } "[Snoopy Picture]".center(nCols * 24 + 4).writeln; writeln(year.text.center(nCols * 24 + 4), "\n"); foreach (immutable r; 0 .. rows) { string[8] s; foreach (immutable c; 0 .. nCols) { if (r * nCols + c > 11) break; foreach (immutable i, line; mons[r * nCols + c]) s[i] ~= format(" %s", line); } writefln("%-(%s\n%)\n", s); } } void main() { printCalendar(1969, 3); }   [Snoopy Picture] 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Fortran Already having a routine to produce a calendar simplified matters. However, it added to each row of days a row of annotations for those days (Xmas, etc. and also +2hh and -2hh for the days with two half-hour changes in length due to daylight saving: NZ also had daylight saving with changes of one half-hour) which meant that the field allowance was always four. With the annotations abandoned, this could be reduced to three, and, the first day column on a line does not need a leading space. Since the method employed variables for the layout, it could easily be twiddled to have three months per line (thus fitting into a line length of 80) or six (using most of a line length of 132) and so it became a matter of pulling together the needed routines from various places.  MODULE DATEGNASH !Assorted vexations. Time and calendar games, with local flavourings added. TYPE DateBag !Pack three parts into one. INTEGER DAY,MONTH,YEAR !The usual suspects. END TYPE DateBag !Simple enough. CHARACTER*9 MONTHNAME(12),DAYNAME(0:6) !Re-interpretations. PARAMETER (MONTHNAME = (/"January","February","March","April", 1 "May","June","July","August","September","October","November", 2 "December"/)) PARAMETER (DAYNAME = (/"Sunday","Monday","Tuesday","Wednesday", 1 "Thursday","Friday","Saturday"/)) !Index this array with DayNum mod 7. CHARACTER*3 MTHNAME(12) !The standard abbreviations. PARAMETER (MTHNAME = (/"JAN","FEB","MAR","APR","MAY","JUN", 1 "JUL","AUG","SEP","OCT","NOV","DEC"/)) INTEGER*4 JDAYSHIFT !INTEGER*2 just isn't enough. PARAMETER (JDAYSHIFT = 2415020) !Thus shall 31/12/1899 give 0, a Sunday, via DAYNUM. CONTAINS INTEGER FUNCTION LSTNB(TEXT) !Sigh. Last Not Blank. Concocted yet again by R.N.McLean (whom God preserve) December MM. Code checking reveals that the Compaq compiler generates a copy of the string and then finds the length of that when using the latter-day intrinsic LEN_TRIM. Madness! Can't DO WHILE (L.GT.0 .AND. TEXT(L:L).LE.' ') !Control chars. regarded as spaces. Curse the morons who think it good that the compiler MIGHT evaluate logical expressions fully. Crude GO TO rather than a DO-loop, because compilers use a loop counter as well as updating the index variable. Comparison runs of GNASH showed a saving of ~3% in its mass-data reading through the avoidance of DO in LSTNB alone. Crappy code for character comparison of varying lengths is avoided by using ICHAR which is for single characters only. Checking the indexing of CHARACTER variables for bounds evoked astounding stupidities, such as calculating the length of TEXT(L:L) by subtracting L from L! Comparison runs of GNASH showed a saving of ~25-30% in its mass data scanning for this, involving all its two-dozen or so single-character comparisons, not just in LSTNB. CHARACTER*(*),INTENT(IN):: TEXT !The bumf. If there must be copy-in, at least there need not be copy back. INTEGER L !The length of the bumf. L = LEN(TEXT) !So, what is it? 1 IF (L.LE.0) GO TO 2 !Are we there yet? IF (ICHAR(TEXT(L:L)).GT.ICHAR(" ")) GO TO 2 !Control chars are regarded as spaces also. L = L - 1 !Step back one. GO TO 1 !And try again. 2 LSTNB = L !The last non-blank, possibly zero. RETURN !Unsafe to use LSTNB as a variable. END FUNCTION LSTNB !Compilers can bungle it. CHARACTER*2 FUNCTION I2FMT(N) !These are all the same. INTEGER*4 N !But, the compiler doesn't offer generalisations. IF (N.LT.0) THEN !Negative numbers cop a sign. IF (N.LT.-9) THEN !But there's not much room left. I2FMT = "-!" !So this means 'overflow'. ELSE !Otherwise, room for one negative digit. I2FMT = "-"//CHAR(ICHAR("0") - N) !Thus. Presume adjacent character codes, etc. END IF !So much for negative numbers. ELSE IF (N.LT.10) THEN !Single digit positive? I2FMT = " " //CHAR(ICHAR("0") + N) !Yes. This. ELSE IF (N.LT.100) THEN !Two digit positive? I2FMT = CHAR(N/10 + ICHAR("0")) !Yes. 1 //CHAR(MOD(N,10) + ICHAR("0")) !These. ELSE !Otherwise, I2FMT = "+!" !Positive overflow. END IF !So much for that. END FUNCTION I2FMT !No WRITE and FORMAT unlimbering. CHARACTER*8 FUNCTION I8FMT(N) !Oh for proper strings. INTEGER*4 N CHARACTER*8 HIC WRITE (HIC,1) N 1 FORMAT (I8) I8FMT = HIC END FUNCTION I8FMT SUBROUTINE SAY(OUT,TEXT) !Gutted version that maintains no file logging output, etc. INTEGER OUT CHARACTER*(*) TEXT WRITE (6,1) TEXT(1:LSTNB(TEXT)) 1 FORMAT (A) END SUBROUTINE SAY INTEGER*4 FUNCTION DAYNUM(YY,M,D) !Computes (JDayN - JDayShift), not JDayN. C Conversion from a Gregorian calendar date to a Julian day number, JDayN. C Valid for any Gregorian calendar date producing a Julian day number C greater than zero, though remember that the Gregorian calendar C was not used before y1582m10d15 and often, not after that either. C thus in England (et al) when Wednesday 2'nd September 1752 (Julian style) C was followed by Thursday the 14'th, occasioning the Eleven Day riots C because creditors demanded a full month's payment instead of 19/30'ths. C The zero of the Julian day number corresponds to the first of January C 4713BC on the *Julian* calendar's naming scheme, as extended backwards C with current usage into epochs when it did not exist: the proleptic Julian calendar. c This function employs the naming scheme of the *Gregorian* calendar, c and if extended backwards into epochs when it did not exist (thus the c proleptic Gregorian calendar) it would compute a zero for y-4713m11d24 *if* c it is supposed there was a year zero between 1BC and 1AD (as is convenient c for modern mathematics and astronomers and their simple calculations), *but* c 1BC immediately preceeds 1AD without any year zero in between (and is a leap year) c thus the adjustment below so that the date is y-4714m11d24 or 4714BCm11d24, c not that this name was in use at the time... c Although the Julian calendar (introduced by himself in what we would call 45BC, c which was what the Romans occasionally called 709AUC) was provoked by the c "years of confusion" resulting from arbitrary application of the rules c for the existing Roman calendar, other confusions remain unresolved, c so precise dating remains uncertain despite apparently precise specifications c (and much later, Dennis the Short chose wrongly for the birth of Christ) c and the Roman practice of inclusive reckoning meant that every four years c was interpreted as every third (by our exclusive reckoning) so that the c leap years were not as we now interpret them. This was resolved by Augustus c but exactly when (and what date name is assigned) and whose writings used c which system at the time of writing is a matter of more confusion, c and this has continued for centuries. C Accordingly, although an algorithm may give a regular sequence of date names, c that does not mean that those date names were used at the time even if the c calendar existed then, because the interpretation of the algorithm varied. c This in turn means that a date given as being on the Julian calendar c prior to about 10AD is not as definite as it may appear and its alignment c with the astronomical day number is uncertain even though the calculation c is quite definite. c C Computationally, year 1 is preceded by year 0, in a smooth progression. C But there was never a year zero despite what astronomers like to say, C so the formula's year 0 corresponds to 1BC, year -1 to 2BC, and so on back. C Thus y-4713 in this counting would be 4714BC on the Gregorian calendar, C were it to have existed then which it didn't. C To conform to the civil usage, the incoming YY, presumed a proper BC (negative) C and AD (positive) year is converted into the computational counting sequence, Y, C and used in the formula. If a YY = 0 is (improperly) offered, it will manifest C as 1AD. Thus YY = -4714 will lead to calculations with Y = -4713. C Thus, 1BC is a leap year on the proleptic Gregorian calendar. C For their convenience, astronomers decreed that a day starts at noon, so that C in Europe, observations through the night all have the same day number. C The current Western civil calendar however has the day starting just after midnight C and that day's number lasts until the following midnight. C C There is no constraint on the values of D, which is just added as it stands. C This means that if D = 0, the daynumber will be that of the last day of the C previous month. Likewise, M = 0 or M = 13 will wrap around so that Y,M + 1,0 C will give the last day of month M (whatever its length) as one day before C the first day of the next month. C C Example: Y = 1970, M = 1, D = 1; JDAYN = 2440588, a Thursday but MOD(2440588,7) = 3. C and with the adjustment JDAYSHIFT, DAYNUM = 25568; mod 7 = 4 and DAYNAME(4) = "Thursday". C The Julian Day number 2440588.0 is for NOON that Thursday, 2440588.5 is twelve hours later. C And Julian Day number 2440587.625 is for three a.m. Thursday. C C DAYNUM and MUNYAD are the infamous routines of H. F. Fliegel and T.C. van Flandern, C presented in Communications of the ACM, Vol. 11, No. 10 (October, 1968). Carefully typed in again by R.N.McLean (whom God preserve) December XXMMIIX. C Though I remain puzzled as to why they used I,J,K for Y,M,D, C given that the variables were named in the INTEGER statement anyway. INTEGER*4 JDAYN !Without rebasing, this won't fit in INTEGER*2. INTEGER YY,Y,M,MM,D !NB! Full year number, so 1970, not 70. Caution: integer division in Fortran does not produce fractional results. C The fractional part is discarded so that 4/3 gives 1 and -4/3 gives -1. C Thus 4/3 might be Trunc(4/3) or 4 div 3 in other languages. Beware of negative numbers! Y = YY !I can fiddle this copy without damaging the original's value. IF (Y.LT.1) Y = Y + 1 !Thus YY = -2=2BC, -1=1BC, +1=1AD, ... becomes Y = -1, 0, 1, ... MM = (M - 14)/12 !Calculate once. Note that this is integer division, truncating. JDAYN = D - 32075 !This is the proper astronomer's Julian Day Number. a + 1461*(Y + 4800 + MM)/4 b + 367*(M - 2 - MM*12)/12 c - 3*((Y + 4900 + MM)/100)/4 DAYNUM = JDAYN - JDAYSHIFT !Thus, *NOT* the actual *Julian* Day Number. END FUNCTION DAYNUM !But one such that Mod(n,7) gives day names. Could compute the day of the year somewhat as follows... c DN:=D + (61*Month + (Month div 8)) div 2 - 30 c + if Month > 2 then FebLength - 30 else 0; TYPE(DATEBAG) FUNCTION MUNYAD(DAYNUM) !Oh for palindromic programming! Conversion from a Julian day number to a Gregorian calendar date. See JDAYN/DAYNUM. INTEGER*4 DAYNUM,JDAYN !Without rebasing, this won't fit in INTEGER*2. INTEGER Y,M,D,L,N !Y will be a full year number: 1950 not 50. JDAYN = DAYNUM + JDAYSHIFT !Revert to a proper Julian day number. L = JDAYN + 68569 !Further machinations of H. F. Fliegel and T.C. van Flandern. N = 4*L/146097 L = L - (146097*N + 3)/4 Y = 4000*(L + 1)/1461001 L = L - 1461*Y/4 + 31 M = 80*L/2447 D = L - 2447*M/80 L = M/11 M = M + 2 - 12*L Y = 100*(N - 49) + Y + L IF (Y.LT.1) Y = Y - 1 !The other side of conformity to BC/AD, as in DAYNUM. MUNYAD%YEAR = Y !Now place for the world to see. MUNYAD%MONTH = M MUNYAD%DAY = D END FUNCTION MUNYAD !A year has 365.2421988 days... INTEGER FUNCTION PMOD(N,M) !Remainder, mod M; always positive even if N is negative. c For date calculations, the MOD function is expected to yield positive remainders, c in line with the idea that MOD(a,b) = MOD(a ± b,b) as is involved in shifting the zero c of the daynumber count by a multiple of seven when considering the day of the week. c For this reason, the zero day was chosen to be 31/12/1899, a Sunday, so that all c day numbers would be positive. But, there was generation at Reefton in 1886. c For some computers, the positive interpretation is implemented, for others, not. c In the case MOD(N,M) = N - Truncate(N/M)*M, MOD(-6,7) = -6 even though MOD(1,7) = 1. INTEGER N,M !The numbers. M presumed positive. PMOD = MOD(MOD(N,M) + M,M) !Double do does de deed. END FUNCTION PMOD !Simple enough. SUBROUTINE CALENDAR(Y1,Y2,COLUMNS) !Print a calendar, with holiday annotations. Careful with the MOD function. MOD(-6,7) may be negative on some systems, positive on others. Thus, PMOD. INTEGER Y1,Y2,YEAR !Ah yes. Year stuff. INTEGER M,M1,M2,MONTH !And within each year are the months. INTEGER*4 DN1,DN2,DN,D !But days are handled via day numbers. INTEGER W,G !Layout: width and gap. INTEGER L,LINE !Vertical layout. INTEGER COL,COLUMNS,COLWIDTH !Horizontal layout. INTEGER CODE !Days are not all alike. CHARACTER*200 STRIPE(6),SPECIAL(6),MLINE,DLINE !Scratchpads. IF (Y1.LE.0) CALL SAY(MSG,"Despite the insinuations of " 1 //"astronomers seduced by the ease of their arithmetic, " 2 //"there is no year zero. 1AD is preceded by 1BC, " 3 //"corresponding to year -1, 2BC to year -2, etc.") IF (Y1.LT.1582) CALL SAY(MSG,"This Gregorian calendar" 1 //" scheme did not exist prior to 1582.") c COLUMNS = 4 !Number of months across the page. c W = 4 !Width of a day's field. c G = 3 !Added gap between month columns. W = 3 !Abandon the annotation of the day's class, so just a space and two digits. G = 1 !Set the gap to one. COLWIDTH = 7*W + G !Seven days to a week, plus a gap. Y:DO YEAR = Y1,Y2 !Step through the years. CALL SAY(MSG,"") !Space out between each year's schedule. IF (YEAR.EQ.0) THEN !This year number is improper. CALL SAY(MSG,"There is no year zero.") !Declare correctness. CYCLE Y !Skip this year. END IF !Otherwise, no evasions. MLINE = "" !Prepare a field.. L = (COLUMNS*COLWIDTH - G - 8)/2 !Find the centre. IF (YEAR.GT.0) THEN !Ordinary Anno Domine years? MLINE(L:) = I8FMT(YEAR) !Yes. Place the year number. ELSE !Otherwise, we're in BC. MLINE(L - 1:) = I8FMT(-YEAR)//"BC" !There is no year zero. END IF !So much for year games. CALL SAY(MSG,MLINE) !Splot the year. DO MONTH = 1,12,COLUMNS !Step through the months of this YEAR. M1 = MONTH !The first of this lot. M2 = MIN(12,M1 + COLUMNS - 1) !The last. MLINE = "" !Scrub the month names. DLINE = "" !Wipe the day names in case COLUMNS does not divide 12. STRIPE = "" !Scrub the day table. SPECIAL = "" !And the associated special day remarks. c L0 = W - 1 !Locate the first day number's first column. L0 = 1 !Cram: no space in front of the Sunday day-of-the-month. DO M = M1,M2 !Work through the months. L = (COLWIDTH - G - LSTNB(MONTHNAME(M)))/2 - 1 !Centre the month name. MLINE(L0 + L:) = MONTHNAME(M) !Splot. DO D = 0,6 !Prepare this month's day name heading. L = L0 + (3 - W) + D*W !Locate its first column. DLINE(L:L + 2) = DAYNAME(D)(1:W - 1) !Squish. END DO !On to the next day. DN1 = DAYNUM(YEAR,M,1) !Day number of the first day of the month. DN2 = DAYNUM(YEAR,M + 1,0)!Thus the last, without annoyance. COL = MOD(PMOD(DN1,7) + 7,7) !What day of the week is the first day? LINE = 1 !Whichever it is, it is on the first line. D = 1 !Day of the month, not number of the day. DO DN = DN1,DN2 !Step through the day numbers of this month. L = L0 + COL*W !Finger the starting column. STRIPE(LINE)(L:L + 1) = I2FMT(D) !Place the two-digit day number. D = D + 1 !Advance to the next day of the current month COL = COL + 1 !So, one more day along in the week. IF (COL.GT.6) THEN !A fresh week is needed? LINE = LINE + 1 !Yes. COL = 0 !Start the new week. END IF !So much for the end of a week. END DO !On to the next day of this month. L0 = L0 + 7*W + G !Locate the start column of the next month's column. END DO !On to the next month in this layer. CALL SAY(MSG,MLINE) !Name the months. C CALL SAY(MSG,"") !Set off. CALL SAY(MSG,DLINE) !Give the day name headings. DO LINE = 1,6 !Now roll the day number table. IF (STRIPE(LINE).NE."") THEN !Perhaps there was no use of the sixth line. CALL SAY(MSG,STRIPE(LINE)) !Ah well. Show the day numbers. END IF !So much for that week line. END DO !On to the next week line. END DO !On to the next batch of months of the YEAR. END DO Y !On to the next YEAR. CALL SAY(MSG,"") !Take a breath. END SUBROUTINE CALENDAR !Enough of this. END MODULE DATEGNASH !An ad-hoc assemblage. PROGRAM SHOW1968 !Put it to the test. USE DATEGNASH INTEGER NCOL DO NCOL = 1,6 CALL CALENDAR(1969,1969,NCOL) END DO END  Selected output, lacking alas the outbursts from Snoopy: three months /line  1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  And with six...  1969 January February March April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31 29 30 30 31 July August September October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 1 2 3 4 1 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 31 30  ## FreeBASIC ' version 17-02-2016 ' compile with: fbc -s console ' TRUE/FALSE are built-in constants since FreeBASIC 1.04 ' For older versions they have to be defined. #Ifndef TRUE #Define FALSE 0 #Define TRUE Not FALSE #EndIf Function WD(m As Integer, d As Integer, y As Integer) As Integer ' Zellerish ' 0 = Sunday, 1 = Monday, 2 = Tuesday, 3 = Wednesday ' 4 = Thursday, 5 = Friday, 6 = Saturday If m < 3 Then ' if m = 1 or m = 2 then m += 12 y -= 1 End If Return (y + (y \ 4) - (y \ 100) + (y \ 400) + d + ((153 * m + 8) \ 5)) Mod 7 End Function Function LEAPYEAR(y As Integer) As Integer If (y Mod 4) <> 0 Then Return FALSE If (y Mod 100) = 0 AndAlso (y Mod 400) <> 0 Then Return FALSE Return TRUE End Function ' ------=< main >=------ Dim As String wdn = "Mo Tu We Th Fr Sa Su" ' weekday names Dim As String mo(1 To 12) => {"January", "February", "March", "April", _ "May", "June", "July", "August", "September", _ "October", "November", "December"} Dim As String tmp1, tmp2, d(1 To 12) Dim As UInteger ml(1 To 12) => {31,28,31,30,31,30,31,31,30,31,30,31} Dim As UInteger i, i1, j, k, y = 1969 Dim As UInteger m_row = 6 Do While InKey <> "" : Wend ' clear keyboard buffer Print : Print " For wich year do want a calendar" Print " Year must be greater then 1752" Input " Input year (enter = 1969)";tmp1 If tmp1 = "" Then Exit Do i = Val(tmp1) If i < 1752 Then Print Print " Can only make a calendar for a year after 1752" Beep : Sleep 5000, 1 : Print Else y = i : Exit Do End If Loop Cls Do While InKey <> "" : Wend ' clear keyboard buffer Print : Print " Make device choice" Print " 132 characters Line printer, 6x2 months (Enter or 1)" Print " 80x43 display, 3x4 months (2)" Do tmp1 = InKey If tmp1 = Chr(13) Or tmp1 = "1" Then Exit Do, Do If tmp1 = "2" Then m_row = 3 Exit Do, Do End If Loop Until tmp1 <> "" Print : Print " Enter, 1 or 2 only" Beep : Sleep 5000, 1 : Print Loop Cls Dim As UInteger char_line = m_row * 22 - 1 If LEAPYEAR(y) = TRUE Then ml(2) = 29 tmp1 = "" For i = 1 To 31 tmp1 = tmp1 + Right((" " + Str(i)), 3) Next For i = 1 To 12 tmp2 = "" j = WD(i,1, y) If j = 0 Then j = 7 j = j - 1 tmp2 = Space(j * 3) + Left(tmp1, ml(i) * 3) + Space(21) d(i) = tmp2 Next Print tmp1 = Str(y) Print Space((char_line + (char_line And 1) - Len(tmp1)) \ 2); tmp1 Print tmp2 = " " ' make the weekday names line For i = 1 To m_row tmp2 = tmp2 + wdn If i < m_row Then tmp2 = tmp2 + " " Next For i = 1 To 12 Step m_row tmp1 = "" For j = i To i + m_row -2 ' make the month names line tmp1 = tmp1 + Left(Space((22 - Len(mo(j))) \ 2) + mo(j) + Space(21), 22) Next tmp1 = tmp1 + Space((22 - Len(mo(i + m_row -1))) \ 2) + mo(i + m_row -1) Print tmp1 Print tmp2 For j = 1 To 85 Step 21 For k = i To i + m_row -2 Print Mid(d(k), j ,21); " "; Next Print Mid(d(i + m_row -1), j ,21) Next Print Next ' empty keyboard buffer While InKey <> "" : Wend 'Print : Print "hit any key to end program Sleep End  {{out}}  1969 January February March April May June Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 1 2 1 2 1 2 3 4 5 6 1 2 3 4 1 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 July August September October November December Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 1 2 3 4 5 1 2 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31  ## F Sharp let getCalendar year = let day_of_week month year = let t = [|0; 3; 2; 5; 0; 3; 5; 1; 4; 6; 2; 4|] let y = if month < 3 then year - 1 else year let m = month let d = 1 (y + y / 4 - y / 100 + y / 400 + t.[m - 1] + d) % 7 //0 = Sunday, 1 = Monday, ... let last_day_of_month month year = match month with | 2 -> if (0 = year % 4 && (0 = year % 400 || 0 <> year % 100)) then 29 else 28 | 4 | 6 | 9 | 11 -> 30 | _ -> 31 let get_month_calendar year month = let min (x: int, y: int) = if x < y then x else y let ld = last_day_of_month month year let dw = 7 - (day_of_week month year) [|[|1..dw|]; [|dw + 1..dw + 7|]; [|dw + 8..dw + 14|]; [|dw + 15..dw + 21|]; [|dw + 22..min(ld, dw + 28)|]; [|min(ld + 1, dw + 29)..ld|]|] let sb_fold (f:System.Text.StringBuilder -> 'a -> System.Text.StringBuilder) (sb:System.Text.StringBuilder) (xs:'a array) = for x in xs do (f sb x) |> ignore sb let sb_append (text:string) (sb:System.Text.StringBuilder) = sb.Append(text) let sb_appendln sb = sb |> sb_append "\n" |> ignore let sb_fold_in_range a b f sb = [|a..b|] |> sb_fold f sb |> ignore let mask_builder mask = Printf.StringFormat<string -> string>(mask) let center n (s:string) = let l = (n - s.Length) / 2 + s.Length let f n s = sprintf (mask_builder ("%" + (n.ToString()) + "s")) s (f l s) + (f (n - l) "") let left n (s:string) = sprintf (mask_builder ("%-" + (n.ToString()) + "s")) s let right n (s:string) = sprintf (mask_builder ("%" + (n.ToString()) + "s")) s let array2string xs = let ys = xs |> Array.map (fun x -> sprintf "%2d " x) let sb = ys |> sb_fold (fun sb y -> sb.Append(y)) (new System.Text.StringBuilder()) sb.ToString() let xsss = let m = get_month_calendar year [|1..12|] |> Array.map (fun i -> m i) let months = [|"January"; "February"; "March"; "April"; "May"; "June"; "July"; "August"; "September"; "October"; "November"; "December"|] let sb = new System.Text.StringBuilder() sb |> sb_append "\n" |> sb_append (center 74 (year.ToString())) |> sb_appendln for i in 0..3..9 do sb |> sb_appendln sb |> sb_fold_in_range i (i + 2) (fun sb i -> sb |> sb_append (center 21 months.[i]) |> sb_append " ") sb |> sb_appendln sb |> sb_fold_in_range i (i + 2) (fun sb i -> sb |> sb_append "Su Mo Tu We Th Fr Sa " |> sb_append " ") sb |> sb_appendln sb |> sb_fold_in_range i (i + 2) (fun sb i -> sb |> sb_append (right 21 (array2string (xsss.[i].[0]))) |> sb_append " ") sb |> sb_appendln for j = 1 to 5 do sb |> sb_fold_in_range i (i + 2) (fun sb i -> sb |> sb_append (left 21 (array2string (xsss.[i].[j]))) |> sb_append " ") sb |> sb_appendln sb.ToString() let printCalendar year = getCalendar year  {{out}} > printCalendar 1969;; val it : string = " 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30 "  ## Factor USING: arrays calendar.format grouping io.streams.string kernel math.ranges prettyprint sequences sequences.interleaved ; IN: rosetta-code.calendar : calendar ( year -- ) 12 [1,b] [ 2array [ month. ] with-string-writer ] with map 3 <groups> [ " " <interleaved> ] map 5 " " <repetition> <interleaved> simple-table. ; : calendar-demo ( -- ) 1969 calendar ; MAIN: calendar-demo  {{out}}  January 1969 February 1969 March 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April 1969 May 1969 June 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July 1969 August 1969 September 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October 1969 November 1969 December 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## FutureBasic  include "ConsoleWindow" dim as Str255 a open "UNIX", 1,"cal 1969" do line input #1, a print a until eof(1) close 1  Output:  1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Gambas Public Sub Main() Shell "cal 1969" End  Output:  1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Go package main import ( "fmt" "time" ) const pageWidth = 80 func main() { printCal(1969) } func printCal(year int) { thisDate := time.Date(year, 1, 1, 1, 1, 1, 1, time.UTC) var ( dayArr [12][7][6]int // month, weekday, week month, lastMonth time.Month weekInMonth, dayInMonth int ) for thisDate.Year() == year { if month = thisDate.Month(); month != lastMonth { weekInMonth = 0 dayInMonth = 1 } weekday := thisDate.Weekday() if weekday == 0 && dayInMonth > 1 { weekInMonth++ } dayArr[int(month)-1][weekday][weekInMonth] = thisDate.Day() lastMonth = month dayInMonth++ thisDate = thisDate.Add(time.Hour * 24) } centre := fmt.Sprintf("%d", pageWidth/2) fmt.Printf("%"+centre+"s\n\n", "[SNOOPY]") centre = fmt.Sprintf("%d", pageWidth/2-2) fmt.Printf("%"+centre+"d\n\n", year) months := [12]string{ " January ", " February", " March ", " April ", " May ", " June ", " July ", " August ", "September", " October ", " November", " December"} days := [7]string{"Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"} for qtr := 0; qtr < 4; qtr++ { for monthInQtr := 0; monthInQtr < 3; monthInQtr++ { // Month names fmt.Printf(" %s ", months[qtr*3+monthInQtr]) } fmt.Println() for monthInQtr := 0; monthInQtr < 3; monthInQtr++ { // Day names for day := 0; day < 7; day++ { fmt.Printf(" %s", days[day]) } fmt.Printf(" ") } fmt.Println() for weekInMonth = 0; weekInMonth < 6; weekInMonth++ { for monthInQtr := 0; monthInQtr < 3; monthInQtr++ { for day := 0; day < 7; day++ { if dayArr[qtr*3+monthInQtr][day][weekInMonth] == 0 { fmt.Printf(" ") } else { fmt.Printf("%3d", dayArr[qtr*3+monthInQtr][day][weekInMonth]) } } fmt.Printf(" ") } fmt.Println() } fmt.Println() } }  Output:  [SNOOPY] 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Haskell import qualified Data.Text as T import Data.Time import Data.Time.Calendar import Data.Time.Calendar.WeekDate import Data.List.Split (chunksOf) import Data.List data Day = Su | Mo | Tu | We | Th | Fr | Sa deriving (Show, Eq, Ord, Enum) data Month = January | February | March | April | May | June | July | August | September | October | November | December deriving (Show, Eq, Ord, Enum) monthToInt :: Month -> Int monthToInt = (+ 1) . fromEnum dayFromDate :: Integer -> Month -> Int -> Int dayFromDate year month day = day' mod 7 where (_, _, day') = toWeekDate fromGregorian year (monthToInt month) day

nSpaces :: Int -> T.Text
nSpaces n = T.replicate n (T.pack " ")

space :: T.Text
space = nSpaces 1

calMarginWidth = 3

calMargin :: T.Text
calMargin = nSpaces calMarginWidth

calWidth = 20

listMonth :: Integer -> Month -> [T.Text]
where
monthHeader = (T.center calWidth ' ') . T.pack $show month weekHeader = (T.intercalate space)$ map (T.pack . show) [(Su)..]

monthLength = toInteger $gregorianMonthLength year$
monthToInt month

firstDay = dayFromDate year month 1

days = replicate firstDay (nSpaces 2) ++
map ((T.justifyRight 2 ' ') . T.pack . show) [1..monthLength]

weeks = map (T.justifyLeft calWidth ' ') $map (T.intercalate space)$
chunksOf 7 days

weeks' = weeks ++ replicate (6 - length weeks) (nSpaces calWidth)

listCalendar :: Integer -> Int -> [[[T.Text]]]
listCalendar year calColumns = (chunksOf calColumns) . (map (listMonth year)) $enumFrom January calColFromCol :: Int -> Int calColFromCol columns = c + if r >= calWidth then 1 else 0 where (c, r) = columns divMod (calWidth + calMarginWidth) colFromCalCol :: Int -> Int colFromCalCol calCol = calCol * calWidth + ((calCol - 1) * calMarginWidth) center :: Int -> String -> String center i a = T.unpack . (T.center i ' ')$ T.pack a

printCal :: [[[T.Text]]] -> IO ()
printCal = mapM_ f where
f c = mapM_ (putStrLn . T.unpack) rows
where rows = map (T.intercalate calMargin) $transpose c printCalendar :: Integer -> Int -> IO () printCalendar year columns = if columns < 20 then putStrLn$ "Cannot print less than 20 columns"
else do
putStrLn $center columns' "[Maybe Snoopy]" putStrLn$ center columns' $show year putStrLn "" printCal$ listCalendar year calcol'
where
calcol' = calColFromCol columns

columns' = colFromCalCol calcol'

*Main> printCalendar 1969 80
[Maybe Snoopy]
1969

January               February                 March
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1                      1
5  6  7  8  9 10 11    2  3  4  5  6  7  8    2  3  4  5  6  7  8
12 13 14 15 16 17 18    9 10 11 12 13 14 15    9 10 11 12 13 14 15
19 20 21 22 23 24 25   16 17 18 19 20 21 22   16 17 18 19 20 21 22
26 27 28 29 30 31      23 24 25 26 27 28      23 24 25 26 27 28 29
30 31
April                   May                   June
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                1  2  3    1  2  3  4  5  6  7
6  7  8  9 10 11 12    4  5  6  7  8  9 10    8  9 10 11 12 13 14
13 14 15 16 17 18 19   11 12 13 14 15 16 17   15 16 17 18 19 20 21
20 21 22 23 24 25 26   18 19 20 21 22 23 24   22 23 24 25 26 27 28
27 28 29 30            25 26 27 28 29 30 31   29 30

July                  August                September
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                   1  2       1  2  3  4  5  6
6  7  8  9 10 11 12    3  4  5  6  7  8  9    7  8  9 10 11 12 13
13 14 15 16 17 18 19   10 11 12 13 14 15 16   14 15 16 17 18 19 20
20 21 22 23 24 25 26   17 18 19 20 21 22 23   21 22 23 24 25 26 27
27 28 29 30 31         24 25 26 27 28 29 30   28 29 30
31
October               November               December
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1       1  2  3  4  5  6
5  6  7  8  9 10 11    2  3  4  5  6  7  8    7  8  9 10 11 12 13
12 13 14 15 16 17 18    9 10 11 12 13 14 15   14 15 16 17 18 19 20
19 20 21 22 23 24 25   16 17 18 19 20 21 22   21 22 23 24 25 26 27
26 27 28 29 30 31      23 24 25 26 27 28 29   28 29 30 31
30


## Huginn

import DateTime as dt;
import Algorithms as algo;
import Text as text;

class Calendar {
_monthNames_ = none;
_dayNames_ = none;
constructor() {
t = dt.now();
_monthNames_ = algo.materialize( algo.map( algo.range( 1, 13 ), @[t]( m ) { dt.format( "%B", t.set_date( 1, m, 1 ) ); } ), tuple );
_dayNames_ = algo.materialize( algo.map( algo.range( 1, 8 ), @[t]( d ) { dt.format( "%a", t.set_date( 1, 1, d ) )[:2]; } ), tuple );
}
print_year( year_, cols_ ) {
t = dt.now();
print( "{:^66d}\n".format( year_ ) );
for ( rm : algo.range( 12 / cols_ ) ) {
m = rm * cols_;
print( text.repeat( "{:^22s}", cols_ ).format( _monthNames_[m:m + cols_]... ) + "\n" );
day = [];
daysInMonth = [];
for ( mc : algo.range( cols_ ) ) {
print( " {} {} {} {} {} {} {} ".format( _dayNames_... ) );
t.set_date( year_, m + mc + 1, 1 );
day.push( - t.get_day_of_week() + 1 );
daysInMonth.push( t.get_days_in_month() );
}
print( "\n" );
haveDay = true;
while ( haveDay ) {
haveDay = false;
for ( mc : algo.range( cols_ ) ) {
for ( d : algo.range( 7 ) ) {
if ( ( day[mc] > 0 ) && ( day[mc] <= daysInMonth[mc] ) ) {
print( " {:2d}".format( day[mc] ) );
haveDay = true;
} else {
print( "   " );
}
day[mc] += 1;
}
print( " " );
}
print( "\n" );
}
}
}
}

main( argv_ ) {
cal = Calendar();
cols = size( argv_ ) > 2 ? integer( argv_[2] ) : 3;
if ( 12 % cols != 0 ) {
cols = 3;
}
cal.print_year(
size( argv_ ) > 1
? integer( argv_[1] )
: dt.now().get_year(),
cols
);
}


Output:

                               1969
January               February               March
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5                  1  2                  1  2
6  7  8  9 10 11 12   3  4  5  6  7  8  9   3  4  5  6  7  8  9
13 14 15 16 17 18 19  10 11 12 13 14 15 16  10 11 12 13 14 15 16
20 21 22 23 24 25 26  17 18 19 20 21 22 23  17 18 19 20 21 22 23
27 28 29 30 31        24 25 26 27 28        24 25 26 27 28 29 30
31

April                  May                   June
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5  6            1  2  3  4                     1
7  8  9 10 11 12 13   5  6  7  8  9 10 11   2  3  4  5  6  7  8
14 15 16 17 18 19 20  12 13 14 15 16 17 18   9 10 11 12 13 14 15
21 22 23 24 25 26 27  19 20 21 22 23 24 25  16 17 18 19 20 21 22
28 29 30              26 27 28 29 30 31     23 24 25 26 27 28 29
30

July                 August              September
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5  6               1  2  3   1  2  3  4  5  6  7
7  8  9 10 11 12 13   4  5  6  7  8  9 10   8  9 10 11 12 13 14
14 15 16 17 18 19 20  11 12 13 14 15 16 17  15 16 17 18 19 20 21
21 22 23 24 25 26 27  18 19 20 21 22 23 24  22 23 24 25 26 27 28
28 29 30 31           25 26 27 28 29 30 31  29 30

October               November              December
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5                  1  2   1  2  3  4  5  6  7
6  7  8  9 10 11 12   3  4  5  6  7  8  9   8  9 10 11 12 13 14
13 14 15 16 17 18 19  10 11 12 13 14 15 16  15 16 17 18 19 20 21
20 21 22 23 24 25 26  17 18 19 20 21 22 23  22 23 24 25 26 27 28
27 28 29 30 31        24 25 26 27 28 29 30  29 30 31


=={{header|Icon}} and {{header|Unicon}}== The procedures ''printCalendar'' handles formatting of large components and uses co-expressions to keep the formatting of week elements in each column synchronized. The procedure ''CalendarFormatWeek'' is a generator that returns heading elements, alignment spacing, and individual days.

procedure main(A)
printCalendar(\A[1]|1969)
end

procedure printCalendar(year)          #: Print a 3 column x 80 char calendar
cols := 3                                        # fixed width
mons := []                                       # table of months
"January February March April May June " ||
"July August September October November December " ?
while put(mons, tab(find(" "))) do move(1)

write(center("[Snoopy Picture]",cols * 24 + 4))  # mandatory ..
write(center(year,cols * 24 + 4), "\n")          # ... headers

M := list(cols)                                  # coexpr container
every  mon := 0 to 9 by cols do {                # go through months by cols
writes("    ")
every i := 1 to cols do {
M[i] := create CalendarFormatWeek(year,mon + i)  # formatting coexpr
}
write()
every 1 to 7 do {                             # 1 to max rows
every c := 1 to cols do {                  # for each column
writes("    ")
every 1 to 7 do writes(right(@M[c],3))  # each row day element
}
write()
}
}
return
end

procedure CalendarFormatWeek(year,m)                #: Format Week for Calendar
static D
initial D := [31,28,31,30,31,30,31,31,30,31,30,31]

every 1 to (d := (julian(m,1,year)+1)%7) do suspend ""    # lead day alignment
every suspend 1 to D[m] do d +:= 1                        # days
if m = 2 & IsLeapYear(year) then suspend (d +:= 1, 29)    # LY adjustment
every d to (6*7) do suspend ""                            # trailer alignment
end


{{libheader|Icon Programming Library}} [http://www.cs.arizona.edu/icon/library/src/procs/datetime.icn datetime.icn provides julian and IsLeapYear]

Output:

                              [Snoopy Picture]
1969

January                 February                 March
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4                        1                        1
5  6  7  8  9 10 11      2  3  4  5  6  7  8      2  3  4  5  6  7  8
12 13 14 15 16 17 18      9 10 11 12 13 14 15      9 10 11 12 13 14 15
19 20 21 22 23 24 25     16 17 18 19 20 21 22     16 17 18 19 20 21 22
26 27 28 29 30 31        23 24 25 26 27 28        23 24 25 26 27 28 29
30 31
April                    May                     June
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4  5                  1  2  3      1  2  3  4  5  6  7
6  7  8  9 10 11 12      4  5  6  7  8  9 10      8  9 10 11 12 13 14
13 14 15 16 17 18 19     11 12 13 14 15 16 17     15 16 17 18 19 20 21
20 21 22 23 24 25 26     18 19 20 21 22 23 24     22 23 24 25 26 27 28
27 28 29 30              25 26 27 28 29 30 31     29 30

July                   August                September
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4  5                     1  2         1  2  3  4  5  6
6  7  8  9 10 11 12      3  4  5  6  7  8  9      7  8  9 10 11 12 13
13 14 15 16 17 18 19     10 11 12 13 14 15 16     14 15 16 17 18 19 20
20 21 22 23 24 25 26     17 18 19 20 21 22 23     21 22 23 24 25 26 27
27 28 29 30 31           24 25 26 27 28 29 30     28 29 30
31
October                 November                December
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4                        1         1  2  3  4  5  6
5  6  7  8  9 10 11      2  3  4  5  6  7  8      7  8  9 10 11 12 13
12 13 14 15 16 17 18      9 10 11 12 13 14 15     14 15 16 17 18 19 20
19 20 21 22 23 24 25     16 17 18 19 20 21 22     21 22 23 24 25 26 27
26 27 28 29 30 31        23 24 25 26 27 28 29     28 29 30 31
30


## J

'''Solution:'''

require 'dates format'               NB. J6.x
require 'dates general/misc/format'  NB. J7.x
calBody=: (1 1 }. _1 _1 }. ":)@(-@(<.@%&22)@[ ]\ calendar@])
calTitle=: (<: - 22&|)@[ center '[Insert Snoopy here]' , '' ,:~ ":@]
formatCalendar=: calTitle , calBody


'''Example use:'''

   80 formatCalendar 1969
[Insert Snoopy here]
1969

Jan         │         Feb         │         Mar
Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa
1  2  3  4│                    1│                    1
5  6  7  8  9 10 11│  2  3  4  5  6  7  8│  2  3  4  5  6  7  8
12 13 14 15 16 17 18│  9 10 11 12 13 14 15│  9 10 11 12 13 14 15
19 20 21 22 23 24 25│ 16 17 18 19 20 21 22│ 16 17 18 19 20 21 22
26 27 28 29 30 31   │ 23 24 25 26 27 28   │ 23 24 25 26 27 28 29
│                     │ 30 31
─────────────────────┼─────────────────────┼─────────────────────
Apr         │         May         │         Jun
Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa
1  2  3  4  5│              1  2  3│  1  2  3  4  5  6  7
6  7  8  9 10 11 12│  4  5  6  7  8  9 10│  8  9 10 11 12 13 14
13 14 15 16 17 18 19│ 11 12 13 14 15 16 17│ 15 16 17 18 19 20 21
20 21 22 23 24 25 26│ 18 19 20 21 22 23 24│ 22 23 24 25 26 27 28
27 28 29 30         │ 25 26 27 28 29 30 31│ 29 30
│                     │
─────────────────────┼─────────────────────┼─────────────────────
Jul         │         Aug         │         Sep
Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa
1  2  3  4  5│                 1  2│     1  2  3  4  5  6
6  7  8  9 10 11 12│  3  4  5  6  7  8  9│  7  8  9 10 11 12 13
13 14 15 16 17 18 19│ 10 11 12 13 14 15 16│ 14 15 16 17 18 19 20
20 21 22 23 24 25 26│ 17 18 19 20 21 22 23│ 21 22 23 24 25 26 27
27 28 29 30 31      │ 24 25 26 27 28 29 30│ 28 29 30
│ 31                  │
─────────────────────┼─────────────────────┼─────────────────────
Oct         │         Nov         │         Dec
Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa│ Su Mo Tu We Th Fr Sa
1  2  3  4│                    1│     1  2  3  4  5  6
5  6  7  8  9 10 11│  2  3  4  5  6  7  8│  7  8  9 10 11 12 13
12 13 14 15 16 17 18│  9 10 11 12 13 14 15│ 14 15 16 17 18 19 20
19 20 21 22 23 24 25│ 16 17 18 19 20 21 22│ 21 22 23 24 25 26 27
26 27 28 29 30 31   │ 23 24 25 26 27 28 29│ 28 29 30 31
│ 30                  │


## Java

{{trans|D}}

import java.text.*;
import java.util.*;

public static void main(String[] args) {
printCalendar(1969, 3);
}

static void printCalendar(int year, int nCols) {
if (nCols < 1 || nCols > 12)
throw new IllegalArgumentException("Illegal column width.");

Calendar date = new GregorianCalendar(year, 0, 1);

int nRows = (int) Math.ceil(12.0 / nCols);
int offs = date.get(Calendar.DAY_OF_WEEK) - 1;
int w = nCols * 24;

String[] monthNames = new DateFormatSymbols(Locale.US).getMonths();

String[][] mons = new String[12][8];
for (int m = 0; m < 12; m++) {

String name = monthNames[m];
int len = 11 + name.length() / 2;
String format = MessageFormat.format("%{0}s%{1}s", len, 21 - len);

mons[m][0] = String.format(format, name, "");
mons[m][1] = " Su Mo Tu We Th Fr Sa";
int dim = date.getActualMaximum(Calendar.DAY_OF_MONTH);

for (int d = 1; d < 43; d++) {
boolean isDay = d > offs && d <= offs + dim;
String entry = isDay ? String.format(" %2s", d - offs) : "   ";
if (d % 7 == 1)
mons[m][2 + (d - 1) / 7] = entry;
else
mons[m][2 + (d - 1) / 7] += entry;
}
offs = (offs + dim) % 7;
}

System.out.printf("%" + (w / 2 + 10) + "s%n", "[Snoopy Picture]");
System.out.printf("%" + (w / 2 + 4) + "s%n%n", year);

for (int r = 0; r < nRows; r++) {
for (int i = 0; i < 8; i++) {
for (int c = r * nCols; c < (r + 1) * nCols && c < 12; c++)
System.out.printf("   %s", mons[c][i]);
System.out.println();
}
System.out.println();
}
}
}


{{out}}


[Snoopy Picture]
1969

January                 February                 March
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1                       1
5  6  7  8  9 10 11     2  3  4  5  6  7  8     2  3  4  5  6  7  8
12 13 14 15 16 17 18     9 10 11 12 13 14 15     9 10 11 12 13 14 15
19 20 21 22 23 24 25    16 17 18 19 20 21 22    16 17 18 19 20 21 22
26 27 28 29 30 31       23 24 25 26 27 28       23 24 25 26 27 28 29
30 31

April                    May                     June
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                 1  2  3     1  2  3  4  5  6  7
6  7  8  9 10 11 12     4  5  6  7  8  9 10     8  9 10 11 12 13 14
13 14 15 16 17 18 19    11 12 13 14 15 16 17    15 16 17 18 19 20 21
20 21 22 23 24 25 26    18 19 20 21 22 23 24    22 23 24 25 26 27 28
27 28 29 30             25 26 27 28 29 30 31    29 30

July                   August                September
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                    1  2        1  2  3  4  5  6
6  7  8  9 10 11 12     3  4  5  6  7  8  9     7  8  9 10 11 12 13
13 14 15 16 17 18 19    10 11 12 13 14 15 16    14 15 16 17 18 19 20
20 21 22 23 24 25 26    17 18 19 20 21 22 23    21 22 23 24 25 26 27
27 28 29 30 31          24 25 26 27 28 29 30    28 29 30
31

October                 November                December
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1        1  2  3  4  5  6
5  6  7  8  9 10 11     2  3  4  5  6  7  8     7  8  9 10 11 12 13
12 13 14 15 16 17 18     9 10 11 12 13 14 15    14 15 16 17 18 19 20
19 20 21 22 23 24 25    16 17 18 19 20 21 22    21 22 23 24 25 26 27
26 27 28 29 30 31       23 24 25 26 27 28 29    28 29 30 31
30


## Julia


using Dates

const pagesizes = Dict( "lpr" => [132, 66], "tn3270" => [80, 43])

[div(pagesizes[prn][1], 22), div(pagesizes[prn][2], 12)] : [1, 1]
pagecols(prn) = haskey(pagesizes, prn) ? pagesizes[prn][1] : 20

function centerobject(x, cols)
content = string(x)
end

function ljustlines(x, cols)
arr = Vector{String}()
for s in split(x, "\n")
end
join(arr, "\n")
end

function formatmonth(yr, mo)
dt = Date("$yr-$mo-01")
dayofweekfirst = dayofweek(dt)
numweeklines = 1
str = centerobject(monthname(dt), 20) * "\nMo Tu We Th Fr Sa Su\n"
str *= " " ^ (3 * (dayofweekfirst - 1)) * lpad(string(1), 2)
for i = 2:daysinmonth(dt)
if (i + dayofweekfirst + 5) % 7 == 0
str *= "\n" * lpad(i, 2)
numweeklines += 1
else
end
end
str *= numweeklines < 6 ? "\n\n\n" : "\n\n"
ljustlines(str, 20)
end

function formatyear(displayyear, printertype)
calmonths = [formatmonth(displayyear, mo) for mo in 1:12]
columns = pagecols(printertype)
monthsperline = pagefit(printertype)[1]
joinspaces = max( (monthsperline > 1) ?
div(columns - monthsperline * 20, monthsperline - 1) : 1, 1)
str = "\n" * centerobject(displayyear, columns) * "\n"
monthcal = [split(formatmonth(displayyear, i), "\n") for i in 1:12]
for i in 1:monthsperline:length(calmonths) - 1
for j in 1:length(monthcal[1])
monthlines = map(x->monthcal[x][j], i:i + monthsperline - 1)
str *= rpad(join(monthlines, " " ^ joinspaces), columns) * "\n"
end
str *= "\n"
end
str
end

function lineprintcalendar(years)
for year in years, printer in keys(pagesizes)
println(formatyear(year, printer))
end
end

lineprintcalendar(1969)



## Kotlin

{{trans|D}}

import java.io.PrintStream
import java.text.DateFormatSymbols
import java.text.MessageFormat
import java.util.Calendar
import java.util.GregorianCalendar
import java.util.Locale

internal fun PrintStream.printCalendar(year: Int, nCols: Byte, locale: Locale?) {
if (nCols < 1 || nCols > 12)
throw IllegalArgumentException("Illegal column width.")
val w = nCols * 24
val nRows = Math.ceil(12.0 / nCols).toInt()

val date = GregorianCalendar(year, 0, 1)
var offs = date.get(Calendar.DAY_OF_WEEK) - 1

val days = DateFormatSymbols(locale).shortWeekdays.slice(1..7).map { it.slice(0..1) }.joinToString(" ", " ")
val mons = Array(12) { Array(8) { "" } }
DateFormatSymbols(locale).months.slice(0..11).forEachIndexed { m, name ->
val len = 11 + name.length / 2
val format = MessageFormat.format("%{0}s%{1}s", len, 21 - len)
mons[m][0] = String.format(format, name, "")
mons[m][1] = days
val dim = date.getActualMaximum(Calendar.DAY_OF_MONTH)
for (d in 1..42) {
val isDay = d > offs && d <= offs + dim
val entry = if (isDay) String.format(" %2s", d - offs) else "   "
if (d % 7 == 1)
mons[m][2 + (d - 1) / 7] = entry
else
mons[m][2 + (d - 1) / 7] += entry
}
offs = (offs + dim) % 7
}

printf("%" + (w / 2 + 10) + "s%n", "[Snoopy Picture]")
printf("%" + (w / 2 + 4) + "s%n%n", year)

for (r in 0 until nRows) {
for (i in 0..7) {
var c = r * nCols
while (c < (r + 1) * nCols && c < 12) {
printf("   %s", mons[c][i])
c++
}
println()
}
println()
}
}

fun main(args: Array<String>) {
System.out.printCalendar(1969, 3, Locale.US)
}


{{out}} See D output.

## Lingo

----------------------------------------
-- @desc      Class "Calendar"
-- @file      parent script "Calendar"
----------------------------------------
property _months
property _weekdayStr
property _refDateObj
property _year
property _calStr

on new (me)
me._months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
me._weekdayStr = "Mo Tu We Th Fr Sa Su"
me._refDateObj = date(1905,1,2)
return me
end

on make (me, year)
me._year = year
me._calStr = ""
-- prefill cal string with spaces
repeat with i = 1 to 38
put emptyLine after _calStr
end repeat
me._write (string(year), 32, 1)
repeat with i = 1 to 12
me._writeMonth(i)
end repeat
return me._calStr
end

on _writeMonth (me, monthNum)
xOffset = (monthNum-1) mod 3 * 24
yOffset = (monthNum-1)/3 * 9 + 2
pre = (20 - me._months[monthNum].length)/2
me._write(me._months[monthNum], 1+xOffset+pre, 1+yOffset)
me._write(me._weekdayStr, 1+xOffset, 2+yOffset)
y = 3
x = ((date(me._year, monthNum, 1) - me._refDateObj) mod 7)+1
repeat with i = 1 to 31
if date(me._year, monthNum, i).month<>monthNum then exit repeat
dayStr = string(i)
if i<10 then put " " before dayStr
me._write(dayStr, x*3-2+xOffset, y+yOffset)
if x=7 then
y = y+1
x = 1
else
x = x+1
end if
end repeat
end

on _write (me, str, x, y)
put str into char x to x+str.length-1 of line y of _calStr
end


Usage:

calObj = script("Calendar").new()
calStr = calObj.make(1969)
put calStr


{{out}}


1969

January                 February                 March
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5                    1  2                    1  2
6  7  8  9 10 11 12     3  4  5  6  7  8  9     3  4  5  6  7  8  9
13 14 15 16 17 18 19    10 11 12 13 14 15 16    10 11 12 13 14 15 16
20 21 22 23 24 25 26    17 18 19 20 21 22 23    17 18 19 20 21 22 23
27 28 29 30 31          24 25 26 27 28          24 25 26 27 28 29 30
31

April                    May                     June
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5  6              1  2  3  4                       1
7  8  9 10 11 12 13     5  6  7  8  9 10 11     2  3  4  5  6  7  8
14 15 16 17 18 19 20    12 13 14 15 16 17 18     9 10 11 12 13 14 15
21 22 23 24 25 26 27    19 20 21 22 23 24 25    16 17 18 19 20 21 22
28 29 30                26 27 28 29 30 31       23 24 25 26 27 28 29
30

July                   August                September
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5  6                 1  2  3     1  2  3  4  5  6  7
7  8  9 10 11 12 13     4  5  6  7  8  9 10     8  9 10 11 12 13 14
14 15 16 17 18 19 20    11 12 13 14 15 16 17    15 16 17 18 19 20 21
21 22 23 24 25 26 27    18 19 20 21 22 23 24    22 23 24 25 26 27 28
28 29 30 31             25 26 27 28 29 30 31    29 30

October                 November                December
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5                    1  2     1  2  3  4  5  6  7
6  7  8  9 10 11 12     3  4  5  6  7  8  9     8  9 10 11 12 13 14
13 14 15 16 17 18 19    10 11 12 13 14 15 16    15 16 17 18 19 20 21
20 21 22 23 24 25 26    17 18 19 20 21 22 23    22 23 24 25 26 27 28
27 28 29 30 31          24 25 26 27 28 29 30    29 30 31



## Lua

function print_cal(year)
local months={"JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE",
"JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER"}
local daysTitle="MO TU WE TH FR SA SU"
local daysPerMonth={31,28,31,30,31,30,31,31,30,31,30,31}
local startday=((year-1)*365+math.floor((year-1)/4)-math.floor((year-1)/100)+math.floor((year-1)/400))%7
if year%4==0 and year%100~=0 or year%400==0 then
daysPerMonth[2]=29
end
local sep=5
local monthwidth=daysTitle:len()
local calwidth=3*monthwidth+2*sep

function center(str, width)
local fill1=math.floor((width-str:len())/2)
local fill2=width-str:len()-fill1
return string.rep(" ",fill1)..str..string.rep(" ",fill2)
end

function makeMonth(name, skip,days)
local cal={
center(name,monthwidth),
daysTitle
}
local curday=1-skip
while #cal<9 do
line={}
for i=1,7 do
if curday<1 or curday>days then
line[i]="  "
else
line[i]=string.format("%2d",curday)
end
curday=curday+1
end
cal[#cal+1]=table.concat(line," ")
end
return cal
end

local calendar={}
for i,month in ipairs(months) do
local dpm=daysPerMonth[i]
calendar[i]=makeMonth(month, startday, dpm)
startday=(startday+dpm)%7
end

print(center("[SNOOPY]",calwidth),"\n")
print(center("--- "..year.." ---",calwidth),"\n")

for q=0,3 do
for l=1,9 do
line={}
for m=1,3 do
line[m]=calendar[q*3+m][l]
end
print(table.concat(line,string.rep(" ",sep)))
end
end
end

print_cal(1969)


{{out}}


[SNOOPY]

--- 1969 ---

JANUARY                  FEBRUARY                  MARCH
MO TU WE TH FR SA SU     MO TU WE TH FR SA SU     MO TU WE TH FR SA SU
1  2  3  4  5                     1  2                     1  2
6  7  8  9 10 11 12      3  4  5  6  7  8  9      3  4  5  6  7  8  9
13 14 15 16 17 18 19     10 11 12 13 14 15 16     10 11 12 13 14 15 16
20 21 22 23 24 25 26     17 18 19 20 21 22 23     17 18 19 20 21 22 23
27 28 29 30 31           24 25 26 27 28           24 25 26 27 28 29 30
31

APRIL                     MAY                      JUNE
MO TU WE TH FR SA SU     MO TU WE TH FR SA SU     MO TU WE TH FR SA SU
1  2  3  4  5  6               1  2  3  4                        1
7  8  9 10 11 12 13      5  6  7  8  9 10 11      2  3  4  5  6  7  8
14 15 16 17 18 19 20     12 13 14 15 16 17 18      9 10 11 12 13 14 15
21 22 23 24 25 26 27     19 20 21 22 23 24 25     16 17 18 19 20 21 22
28 29 30                 26 27 28 29 30 31        23 24 25 26 27 28 29
30

JULY                    AUGUST                 SEPTEMBER
MO TU WE TH FR SA SU     MO TU WE TH FR SA SU     MO TU WE TH FR SA SU
1  2  3  4  5  6                  1  2  3      1  2  3  4  5  6  7
7  8  9 10 11 12 13      4  5  6  7  8  9 10      8  9 10 11 12 13 14
14 15 16 17 18 19 20     11 12 13 14 15 16 17     15 16 17 18 19 20 21
21 22 23 24 25 26 27     18 19 20 21 22 23 24     22 23 24 25 26 27 28
28 29 30 31              25 26 27 28 29 30 31     29 30

OCTOBER                  NOVEMBER                 DECEMBER
MO TU WE TH FR SA SU     MO TU WE TH FR SA SU     MO TU WE TH FR SA SU
1  2  3  4  5                     1  2      1  2  3  4  5  6  7
6  7  8  9 10 11 12      3  4  5  6  7  8  9      8  9 10 11 12 13 14
13 14 15 16 17 18 19     10 11 12 13 14 15 16     15 16 17 18 19 20 21
20 21 22 23 24 25 26     17 18 19 20 21 22 23     22 23 24 25 26 27 28
27 28 29 30 31           24 25 26 27 28 29 30     29 30 31



## M2000 Interpreter

Set console to 80 character by 43 lines. Produce calendar line by line, three columns of months.

To simulate printing in paper we print at the bottom line, so every new line scroll up the console screen.

Module Calendar get the Year and the Language Id (1033 for English, 1032 for Greek and any other which support the Window OS).


Module Calendar (Year, LocaleId) {
Function GetMax(Year, Month) {
a=date(str$(Year)+"-"+str$(Month)+"-1")
max=32
do {
max--
m=val(str$(cdate(a,0,0,max), "m")) } until m=Month =max+1 } Function SkipMo(Year, Month) { a=date(str$(Year)+"-"+str$(Month)+"-1") =(val(str$(a, "w"))-8) mod 7 +7
}
Function Title$(a$) {
=Ucase$(left$(a$,1))+Lcase$(Mid$(a$, 2))
}
locale LocaleId
Cursor 0,Height-1  ' last line, so each new line scroll all lines up
Print Over $(2), Year Print For j=0 to 3 { Print For i=1 to 3 { Month=i+j*3 Print Part @((i-1)*29),$(2,22), Title$(Ucase$(locale$(55+Month))) } Print Dim Skip(1 to 3), Count(1 to 3), D(1 to 3)=1 For i=1 to 3 { Month=i+j*3 if i>1 Then Print String$(" ",8);
For k=42 to 48 :Print Title$(Ucase$(Left$(locale$(k),2)));" ";:Next k
Skip(i)=SkipMo(Year, Month)
Count(i)=GetMax(Year, Month)
}
Print
For i=1 to 3 {
if i>1 Then Print String$(" ",8); For k=1 to 7 { skip(i)-- if skip(i)>0 Then Print " "; :continue Count(i)-- Print format$("{0::-2} ", d(i));
d(i)++
}
}
Print
Print @(0)
For m=1 to 5 {
For i=1 to 3 {
if i>1 Then Print String$(" ",8); For k=1 to 7 { Count(i)-- if Count(i)<0 Then Print " "; : Continue Print format$("{0::-2} ", d(i));
d(i)++
}
}
Print
}
}
}
Form 80,43
Calendar 1969, 1033 ' English
k=Key$' wait key Calendar 2018, 1032 ' Greek  ## Mathematica Calendar is set of routines for handling calendars; It is built into Mathematica. We're only going to use it for a two functions, namely, '''DayOfWeek''' and '''DaysBetween'''.  Needs["Calendar"];  Monthly calendar takes a year and a month and returns a simply formatted calendar for that month. It knows about leap years.  monthlyCalendar[y_, m_] := Module[{ days = {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}, months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"}, d1, shortDays, offset, daysInMonth}, d1 = DayOfWeek[{y, m, 1}]; daysInMonth[year_, month_] := DaysBetween[{year, month, 1}, {If[month == 12, year + 1, year], If[month == 12, 1, month + 1], 1}]; shortDays = (StringTake[ToString[#], 3] & /@ days); offset = d1 /. Thread[days -> Range[0, 6]]; Grid[ Prepend[ Prepend[ Partition[ PadRight[PadLeft[Range[daysInMonth[y, m]], daysInMonth[y, m] + offset, ""], 36, "" ], 7], shortDays], {months[[m]], SpanFromLeft}]]]  '''yearlyCalendar''' prints out calendars for each of the 12 months in the year.  yearlyCalendar[y_] := Grid[Partition[Table[monthlyCalendar[y, k], {k, 12}], 3], Spacings -> {4, 2}];  ## OCaml #load "unix.cma" let lang = "en" (* language: English *) let usage () = Printf.printf "Usage:\n%s\n" Sys.argv.(0) let month_pattern = [ [ 0; 4; 8 ]; [ 1; 5; 9 ]; [ 2; 6; 10 ]; [ 3; 7; 11 ]; (* [ 0; 1; 2; 3; 4; 5 ]; [ 6; 7; 8; 9; 10; 11 ]; [ 0; 1; 2; 3 ]; [ 4; 5; 6; 7 ]; [ 8; 9; 10; 11 ]; *) ] let month_langs = [ "en", [| "January"; "February"; "March"; "April"; "May"; "June"; "July"; "August"; "September"; "October"; "November"; "December"; |]; "fr", [| "janvier"; "février"; "mars"; "avril"; "mai"; "juin"; "juillet"; "août"; "septembre"; "octobre"; "novembre"; "décembre"; |]; ] let days_lang = [ "en", [| "Monday"; "Tuesday"; "Wednesday"; "Thursday"; "Friday"; "Saturday"; "Sunday" |]; "fr", [| "lundi"; "mardi"; "mercredi"; "jeudi"; "vendredi"; "samedi"; "dimanche" |]; ] let titles_lang = [ "en", "( Snoopy's best pic )"; "fr", "( Le meilleur profil de Snoopy )"; ] let days = List.assoc lang days_lang let month = List.assoc lang month_langs let title = List.assoc lang titles_lang let monday_first = 6, [| 0; 1; 2; 3; 4; 5; 6 |] let sunday_first = 0, [| 6; 0; 1; 2; 3; 4; 5 |] let off, days_order = sunday_first let off, days_order = monday_first let shorten n s = let len = String.length s in if n >= len then s else let n = if s.[n-1] = '\xC3' then n+1 else n in if n >= len then s else (String.sub s 0 n) let pad size c s = let len = String.length s in let n1 = (size - len) / 2 in let n2 = size - len - n1 in String.make n1 c ^ s ^ String.make n2 c let days = Array.map (shorten 2) days let indices ofs = (ofs / 7, ofs mod 7) let t_same t1 t2 = ( t1.Unix.tm_year = t2.Unix.tm_year && t1.Unix.tm_mon = t2.Unix.tm_mon && t1.Unix.tm_mday = t2.Unix.tm_mday ) let current_year () = let t = Unix.localtime (Unix.time ()) in (t.Unix.tm_year + 1900) let make_month t year month = let empty_day = 0 in let m = Array.make_matrix 6 7 empty_day in let ofs = ref 0 in for day = 1 to 31 do let tm = { t with Unix.tm_year = year - 1900; Unix.tm_mon = month; Unix.tm_mday = day; } in let _, this = Unix.mktime tm in if !ofs = 0 then ofs := (this.Unix.tm_wday + off) mod 7; if t_same this tm then let i, j = indices !ofs in m.(i).(j) <- day; incr ofs; done; (m) let cal ~year = let empty = [| [| |] |] in let months = Array.make 12 empty in let t = Unix.gmtime 0.0 in for mon = 0 to 11 do months.(mon) <- make_month t year mon; done; (months) let print_month_label mp = List.iter (fun i -> let mon = pad 20 ' ' month.(i) in Printf.printf " %s " mon ) mp; print_newline () let print_day_label mp = List.iter (fun _ -> Array.iter (fun i -> Printf.printf " %s" days.(i) ) days_order ; print_string " " ) mp; print_newline () let print_mon m mp = print_month_label mp; print_day_label mp; for w = 0 to pred 6 do print_string begin String.concat " " begin List.map (fun i -> let b = Buffer.create 132 in for d = 0 to pred 7 do match m.(i).(w).(d) with | 0 -> Buffer.add_string b " " | d -> Printf.kprintf (Buffer.add_string b) " %2d" d done; (Buffer.contents b) ) mp end end ; print_string "\n" done let print_cal ~y:m = List.iter (fun mon_row -> print_mon m mon_row ) month_pattern let print_header lbl = let n = List.length (List.hd month_pattern) in let year_lbl = pad (23*n-7) ' ' lbl in Printf.printf " %s\n" year_lbl let print_calendar ~year = print_header title; print_header (string_of_int year); print_cal (cal ~year) let () = let args = List.tl (Array.to_list Sys.argv) in match args with | [] -> let year = current_year () in print_calendar ~year | ["--year"; _year] -> let year = int_of_string _year in print_calendar ~year | _ -> usage ()  {{out}} $ ocaml calendar.ml --year 1969

( Snoopy's best pic )
1969
January                 May                September
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5            1  2  3  4   1  2  3  4  5  6  7
6  7  8  9 10 11 12   5  6  7  8  9 10 11   8  9 10 11 12 13 14
13 14 15 16 17 18 19  12 13 14 15 16 17 18  15 16 17 18 19 20 21
20 21 22 23 24 25 26  19 20 21 22 23 24 25  22 23 24 25 26 27 28
27 28 29 30 31        26 27 28 29 30 31     29 30

February                June                October
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2                     1         1  2  3  4  5
3  4  5  6  7  8  9   2  3  4  5  6  7  8   6  7  8  9 10 11 12
10 11 12 13 14 15 16   9 10 11 12 13 14 15  13 14 15 16 17 18 19
17 18 19 20 21 22 23  16 17 18 19 20 21 22  20 21 22 23 24 25 26
24 25 26 27 28        23 24 25 26 27 28 29  27 28 29 30 31
30
March                  July                November
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2      1  2  3  4  5  6                  1  2
3  4  5  6  7  8  9   7  8  9 10 11 12 13   3  4  5  6  7  8  9
10 11 12 13 14 15 16  14 15 16 17 18 19 20  10 11 12 13 14 15 16
17 18 19 20 21 22 23  21 22 23 24 25 26 27  17 18 19 20 21 22 23
24 25 26 27 28 29 30  28 29 30 31           24 25 26 27 28 29 30
31
April                 August               December
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5  6               1  2  3   1  2  3  4  5  6  7
7  8  9 10 11 12 13   4  5  6  7  8  9 10   8  9 10 11 12 13 14
14 15 16 17 18 19 20  11 12 13 14 15 16 17  15 16 17 18 19 20 21
21 22 23 24 25 26 27  18 19 20 21 22 23 24  22 23 24 25 26 27 28
28 29 30              25 26 27 28 29 30 31  29 30 31



## PowerShell


Param([int]$Year = 1969) Begin {$COL_WIDTH = 21
$COLS = 3$MONTH_COUNT = 12
$MONTH_LINES = 9 Function CenterStr([string]$s, [int]$lineSize) {$padSize = [int](($lineSize -$s.Length) / 2)
($(if ($padSize -gt 0) { ' ' * $padSize } else { '' }) +$s).PadRight($lineSize,' ') } Function MonthLines([int]$month) {
$dt = [System.DateTime]::new($Year, $month, 1)$line = CenterStr $dt.ToString("MMMM")$COL_WIDTH
$line += 'Su Mo Tu We Th Fr Sa'$line += $(' ' *$dt.DayOfWeek.value__)
$line += (-join ($(1..$($dt.AddMonths(1).AddDays(-1).Day)) | %{ $("" +$_).PadLeft(3) }))
$line =$line.PadRight($MONTH_LINES *$COL_WIDTH)
New-Object –TypeName PSObject –Prop(@{
'Lines'=(0..($MONTH_LINES - 1)) | %{$_ * $COL_WIDTH } | %{ -join$line[$_..($_ + $COL_WIDTH - 1)] } 'Dt'=$dt})
}
}
Process {
Write-Output (CenterStr $Year ($COL_WIDTH * $COLS + 4))$(0..($MONTH_COUNT /$COLS - 1)) | %{
$fm =$_ * $COLS$monthNums = $fm..($fm + $COLS - 1) | %{$_ + 1 }
$months =$monthNums | %{ MonthLines $_ }$(0..($MONTH_LINES - 1)) | %{$ml = $_ Write-Output$(-join ($(0..($COLS - 1)) | %{ $(if ($_ -eq 0) { '' } else {'  '}) + $months[$_].Lines[$ml] })) } } }  ## Perl #!/usr/bin/perl use strict; use warnings; use Time::Local; my @names = qw/ JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC/; my$year = shift ||'2007';

for my $month (0..11) { print "$names[$month]$year\n";
print calendar($year,$month), "\n\n";
}

sub calendar {
my ($year,$month) = @_;
my @mon_days = qw/31 28 31 30 31 30 31 31 30 31 30 31/;
++$mon_days[1] if$year % 4 == 0 && ($year % 400 == 0 ||$year % 1
+00 != 0);

my $cal = " Sun Mon Tue Wed Thu Fri Sat\n"; # Months are indexed beginning at 0 my$time = timegm(0,0,0,1,$month,$year);
my $wday = (gmtime$time)[6];

$cal .= " " x$wday;

my $mday = 1; while ($mday <= $mon_days[$month]) {
$cal .= sprintf "%4s",$mday++;
$cal .= "\n" if ($wday + $mday -1) % 7 == 0; } return$cal;
}
# Let's use this as a placeholder until a better solution arrives, OK?


## Perl 6

{{works with|Rakudo|2015.12}}

my $months-per-col = 3; my @week-day-names = <Mo Tu We Th Fr Sa Su>; my @month-names = <Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec>; my Int$year = +(@*ARGS.shift || 1969);

say fmt-year($year); exit; sub fmt-year ($year) {

my $str = (' ' x 30) ~$year ~ "\n";

my Array @month-strs;
@month-strs[$_] = fmt-month($year, $_).lines.Array for 1 .. 12; loop ( my$month = 1; $month <= 12;$month += $months-per-col ) { while @month-strs[$month] {
for ^$months-per-col { next unless @month-strs[$month+$_];$str ~= @month-strs[$month+$_].shift;
$str ~= " " x 3; }$str ~= "\n";
}
$str ~= "\n"; } return$str;
}
sub fmt-month ($year,$month) {
my $str = sprintf "%-20s\n", @month-names[$month-1];
$str ~= @week-day-names~"\n"; my$date = DateTime.new(year => $year, month =>$month);
my $week-day =$date.day-of-week;

$str ~= (" " xx$week-day-1).join(" ");

for $date.day ..$date.days-in-month -> $day {$date = DateTime.new(year => $year, month =>$month, day => $day);$str ~= " " if 1 < $week-day < 8; if$week-day == 8 {
$str ~= "\n";$week-day = 1;
}
$str ~= sprintf "%2d",$day;

$week-day++; }$str ~= " " if $week-day < 8;$str ~= ("  " xx 8-$week-day).join(" ");$str ~= "\n";
return str; }  ## Phix Gregorian calender only. include builtins\timedate.e function centre(string s, integer width) integer pad = width-length(s), left = floor(pad/2), right = pad-left return repeat(' ',left)&s&repeat(' ',right) end function function one_month(integer year, integer month) integer dow = day_of_week(year,month,1) sequence ldm = adjust_timedate(iff(month=12?{year+1,1,1,0,0,0,0,0} :{year,month+1,1,0,0,0,0,0}), timedelta(days:=-1)) sequence res = {centre(format_timedate(ldm,"Mmmm"),20),"Su Mo Tu We Th Fr Sa"} integer lastday = ldm[DT_DAY] string line = repeat(' ',20) integer p = dow*3-2 for d=1 to lastday do line[p..p+1] = sprintf("%2d",d) p += 3 if dow=7 or d=lastday then res = append(res,line) line = repeat(' ',20) dow = 1 p = 1 else dow += 1 end if end for return res end function procedure print_calendar(integer year, integer width) sequence months = repeat(0,12) integer wide = floor((width+2)/22) printf(1,centre("[Spot Reserved For Snoopy]",width)&"\n") printf(1,centre(sprintf("%d",year),width)&"\n") for month=1 to 12 do months[month] = one_month(year,month) end for for month=1 to 12 by wide do for k=1 to 9 do -- (more than enough) integer any = 0 string line = "", this for j=0 to wide-1 do if length(line) then line &= " " end if if k>length(months[month+j]) then line &= repeat(' ',20) else line &= months[month+j][k] any = 1 end if end for if any=0 then exit end if printf(1,centre(line,width)&"\n") end for end for end procedure print_calendar(1969,80) printf(1,join(repeat("1234567890",8),"")&"\n") print_calendar(1969,132) printf(1,join(repeat("1234567890",13),"")&"12\n")  {{out}}  [Spot Reserved For Snoopy] 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30 12345678901234567890123456789012345678901234567890123456789012345678901234567890 [Spot Reserved For Snoopy] 1969 January February March April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31 29 30 30 31 July August September October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 1 2 3 4 1 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 31 30 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012  ## PicoLisp This "calendar" is nicely formatted, and fits into 20 columns ;-) (de cal (Year) (prinl "====== " Year " ======") (for Dat (range (date Year 1 1) (date Year 12 31)) (let D (date Dat) (tab (3 3 4 8) (when (= 1 (caddr D)) (get *Mon (cadr D)) ) (caddr D) (day Dat *Day) (when (=0 (% (inc Dat) 7)) (pack "Week " (week Dat)) ) ) ) ) ) (cal 1969)  Output:  ### === 1969 === Jan 1 Wed 2 Thu 3 Fri 4 Sat 5 Sun 6 Mon Week 2 7 Tue .... 28 Sat 29 Sun 30 Mon Week 27 Jul 1 Tue 2 Wed 3 Thu 4 Fri .... 25 Thu 26 Fri 27 Sat 28 Sun 29 Mon Week 53 30 Tue 31 Wed  ## Pike the Calendar in Pike does not handle the transitions from the Julian to the Gregorian calendar, but it handles those separately. the default calendar is ISO, other options are Gregorian, Julian, Bahai, Coptic, Islamic and Discordian. this script also highlights holidays by region. regions may be chosen by 2-letter country name, as well as some special 'regions': christianity, orthodox, bahai, islamic, among others. #!/bin/env pike int main(int argc, array(string) argv) { object cal = Calendar; object year; string region = "us"; array date = argv[1..]; if (sizeof(date) && objectp(Calendar[date[0]]) && Calendar[date[0]]->Day) { cal = Calendar[date[0]]; date = Array.shift(date)[1]; } if (sizeof(date) && (int)date[0]) { year = cal.Year((int)date[0]); date = Array.shift(date)[1]; } if (sizeof(date)) region = date[0]; if (!year) year = cal.Year(); print_year(year, region); } array make_month(object month, int field_width, void|string region) { array out =({}); mapping holidays = ([]); object today = Calendar.Day(); if (region) holidays = Calendar.Events.find_region(region)->scan_events(month); array weekday_names = sprintf("%*.*s", field_width, field_width, month->week()->days()->week_day_shortname()[*]); out += ({ ({ month->month_name(), month->month_no(), month->year_name() }) }); out += ({ weekday_names }); out += showday(month->weeks()->days()[*][*], month, today, holidays, field_width); out += ({ ({ " "*field_width })*sizeof(weekday_names) }); return out; } string print_month(object _month, void|int field_width, void|string region) { if (!field_width) field_width = 2; array month = make_month(_month, field_width, region); string out = ""; out += sprintf("%|*s\n", (field_width+1)*sizeof(month[1])-1, sprintf("%s", month[0][0])); out += sprintf((month[1..][*]*" ")*"\n"); return out; } string print_year(object year, void|string region) { array output = ({}); int day_width = 2; int columns = Stdio.stdout.tcgetattr()->columns; int month_width = sizeof(make_month(year->month(), day_width)[1]) * (day_width+1) - 1; if (columns < month_width) columns = month_width; // try to find an optimal good looking solution to spread the months // across the terminal width // for the common calendar of 12 months this is easy but we need to // account for caledars that have more than 12 months float max_width = (float)((columns+2)/(month_width+2)); float max_height = ceil(year->number_of_months()/max_width); float w = max_width; while(ceil(year->number_of_months()/(w-1)) == max_height) w--; foreach(print_month(year->months()[*], day_width, region)/w;; array row) { array rows = row[*]/"\n"; int l = max(@sizeof(rows[*])); foreach(rows; int i;) { // the last line of each month is an empty line. // repeat the line as many times as needed to make the months equally long rows[i]+=({ rows[i][-1] })*(l-sizeof(rows[i])); } rows = Array.transpose(rows); output += rows[*]*" "; } write("%*|s\n", sizeof(output[1]), year->format_nice()); write(output * "\n"); write("\n"); } string showday(object day, object month, object today, mapping holidays, int field_width) { string dayname; if (day->month() == month) { dayname = (string)day->month_day(); dayname = " "*(sizeof((string)month->number_of_days())-sizeof(dayname))+dayname; if (day == today) dayname = sprintf("%|*.*s", field_width, field_width, dayname); else dayname = sprintf("%|*.*s", field_width, field_width, dayname); if (holidays[day]) dayname = sprintf("%|s", dayname); } else dayname = " "*field_width; return dayname; }  Output: (holidays lost in copy-paste)  1969 January February March Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 1 2 1 2 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 31 April May June Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 1 2 3 4 1 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 30 July August September Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 October November December Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 1 2 1 2 3 4 5 6 7 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31  ## PL/I  calendar: procedure (year) options (main); declare year character (4) varying; declare (a, b, c) (0:5,0:6) character (3); declare name_month(12) static character (9) varying initial ( 'JANUARY', 'FEBRUARY', 'MARCH', 'APRIL', 'MAY', 'JUNE', 'JULY', 'AUGUST', 'SEPTEMBER', 'OCTOBER', 'NOVEMBER', 'DECEMBER'); declare i fixed; declare (mm, mmp1, mmp2) pic '99'; put edit (center('CALENDAR FOR ' || YEAR, 67)) (a); put skip (2); do mm = 1 to 12 by 3; mmp1 = mm + 1; mmp2 = mm + 2; call prepare_month('01' || mm || YEAR, a); call prepare_month('01' || mmp1 || YEAR, b); call prepare_month('01' || mmp2 || YEAR, c); put skip edit (center(name_month(mm), 23), center(name_month(mmp1), 23), center(name_month(mmp2), 23) ) (a); put skip edit ((3)' M T W T F S S ') (a); do i = 0 to 5; put skip edit (a(i,*), b(i,*), c(i,*)) (7 a, x(2)); end; end; prepare_month: procedure (start, month); declare month(0:5,0:6) character (3); declare start character (8); declare i pic 'ZZ9'; declare offset fixed; declare (j, day) fixed binary (31); declare (this_month, next_month, k) fixed binary; day = days(start, 'DDMMYYYY'); offset = weekday(day) - 1; if offset = 0 then offset = 7; month = ''; do j = day by 1; this_month = substr(daystodate(j, 'DDMMYYYY'), 3, 2); next_month = substr(daystodate(j+1, 'DDMMYYYY'), 3, 2); if this_month^= next_month then leave; end; i = 1; do k = offset-1 to offset+j-day-1; month(k/7, mod(k,7)) = i; i = i + 1; end; end prepare_month; end calendar;  Output:  CALENDAR FOR 1969 JANUARY FEBRUARY MARCH M T W T F S S M T W T F S S M T W T F S S 1 2 3 4 5 1 2 1 2 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 31 APRIL MAY JUNE M T W T F S S M T W T F S S M T W T F S S 1 2 3 4 5 6 1 2 3 4 1 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 30 JULY AUGUST SEPTEMBER M T W T F S S M T W T F S S M T W T F S S 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 OCTOBER NOVEMBER DECEMBER M T W T F S S M T W T F S S M T W T F S S 1 2 3 4 5 1 2 1 2 3 4 5 6 7 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31  Extract for 2013:  CALENDAR FOR 2013 JANUARY FEBRUARY MARCH M T W T F S S M T W T F S S M T W T F S S 1 2 3 4 5 6 1 2 3 1 2 3 7 8 9 10 11 12 13 4 5 6 7 8 9 10 4 5 6 7 8 9 10 14 15 16 17 18 19 20 11 12 13 14 15 16 17 11 12 13 14 15 16 17 21 22 23 24 25 26 27 18 19 20 21 22 23 24 18 19 20 21 22 23 24 28 29 30 31 25 26 27 28 25 26 27 28 29 30 31  ## Prolog Call the write_calendar(Year) predicate to print a calendar for a year. Works with swi-prolog and requires the day_of_the_week library call. % Write out the calender, because format can actually span multiple lines, it is easier % to write out the static parts in place and insert the generated parts into that format. write_calendar(Year) :- month_x3_format(Year, 1, 2, 3, F1_3), month_x3_format(Year, 4, 5, 6, F4_6), month_x3_format(Year, 7, 8, 9, F7_9), month_x3_format(Year, 10, 11, 12, F10_12), format(' ~w January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa ~w April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa ~w July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa ~w October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa ~w ', [Year, F1_3, F4_6, F7_9, F10_12]), !. % Generate the data for a row of months and then create an atom one row at a time % for all of the months. month_x3_format(Year, M1, M2, M3, F) :- calc_month_rows(Year, M1, M1r), calc_month_rows(Year, M2, M2r), calc_month_rows(Year, M3, M3r), month_x3_format(M1r, M2r, M3r, F). month_x3_format(M1, M2, M3, '') :- maplist(=(' '), M1), maplist(=(' '), M2), maplist(=(' '), M3). month_x3_format(M1, M2, M3, F) :- month_format(' ', M1, M1r, F1), month_format(F1, M2, M2r, F2), month_format(F2, M3, M3r, F3), atom_concat(F3, '\n', F4), month_x3_format(M1r, M2r, M3r, Fr), atom_concat(F4, Fr, F). month_format(Orig, [Su,Mo,Tu,We,Th,Fr,Sa|R], R, F) :- maplist(day_format, [Su,Mo,Tu,We,Th,Fr,Sa], Formatted), format(atom(F2), '~w~w~w~w~w~w~w ', Formatted), atom_concat(Orig, F2, F). day_format(' ', ' ') :- !. day_format(D, F) :- D < 10, format(atom(F), '~w ', D). day_format(D, F) :- D >= 10, format(atom(F), '~w ', D). % Calculate the days of a month, this is done by getting the first day of the month, % then offsetting that with spaces from the start and then adding 1-NumDaysinMonth and % finally spaces until the end. The maximum possible size is used and then truncated later. calc_month_rows(Year, Month, Result) :- length(Result, 42), % max 6 rows of 7 days month_days(Month, Year, DaysInMonth), day_of_the_week(date(Year, Month, 1), FirstWeekDay), day_offset(FirstWeekDay, Offset), day_print_map(DaysInMonth, Offset, Result). day_print_map(DaysInMonth, 0, [1|R]) :- day_print_map2(DaysInMonth, 2, R). day_print_map(DaysInMonth, Offset, [' '|R]) :- dif(Offset, 0), succ(NewOffset, Offset), day_print_map(DaysInMonth, NewOffset, R). day_print_map2(D, D, [D|R]) :- day_print_map(R). day_print_map2(D, N, [N|R]) :- dif(D,N), succ(N, N1), day_print_map2(D, N1, R). day_print_map([]). day_print_map([' '|R]) :- day_print_map(R). % Figure out the number of days in a month based on whether it is a leap year or not. month_days(2, Year, Days) :- is_leap_year(Year) -> Days = 29 ; Days = 28. month_days(Month, _, Days) :- dif(Month, 2), nth1(Month, [31, _, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31], Days). % Figure out the space offset based on the day the month starts on. day_offset(D, D) :- dif(D, 7). day_offset(7, 0). % Test for leap years is_leap_year(Year) :- 0 is Year mod 100 -> 0 is Year mod 400 ; 0 is Year mod 4.  ## Python The Python [https://docs.python.org/3/library/calendar.html calendar].prcal function prints calendars with the following formatting options: optional parameters w, l, and c are for date column width, lines per week, and number of spaces between month columns, respectively.  import calendar >>> help(calendar.prcal) Help on method pryear in module calendar: pryear(self, theyear, w=0, l=0, c=6, m=3) method of calendar.TextCalendar instance Print a years calendar. >>> calendar.prcal(1969) 1969 January February March Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 1 2 1 2 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 31 April May June Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 1 2 3 4 1 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 30 July August September Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 October November December Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su 1 2 3 4 5 1 2 1 2 3 4 5 6 7 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31  ## Racket #lang racket (require racket/date net/base64 file/gunzip) (define (calendar yr) (define (nsplit n l) (if (null? l) l (cons (take l n) (nsplit n (drop l n))))) (define months (for/list ([mn (in-naturals 1)] [mname '(January February March April May June July August September October November December)]) (define s (find-seconds 0 0 12 1 mn yr)) (define pfx (date-week-day (seconds->date s))) (define days (let ([? (if (= mn 12) (λ(x y) y) (λ(x y) x))]) (round (/ (- (find-seconds 0 0 12 1 (? (+ 1 mn) 1) (? yr (+ 1 yr))) s) 60 60 24)))) (list* (~a mname #:width 20 #:align 'center) "Su Mo Tu We Th Fr Sa" (map string-join (nsplit 7 (,@(make-list pfx " ") ,@(for/list ([d days]) (~a (+ d 1) #:width 2 #:align 'right)) ,@(make-list (- 42 pfx days) " "))))))) (let ([s #"nZA7CsAgDED3nCLgoAU/3Uvv4SCE3qKD5OyNWvoBhdIHSswjMYp4YR2z80Tk8StOgP sY0EyrMZOE6WsL3u4G5lyV+d8MyVOy8hZBt7RSMca9Ac/KUIs1L/BOysb50XMtMzEj ZqiuRxIVqI+4kSpy7GqpXNsz+bfpfWIGOAA="] [o (open-output-string)]) (inflate (open-input-bytes (base64-decode s)) o) (display (regexp-replace #rx"~a" (get-output-string o) (~a yr)))) (for-each displayln (dropf-right (for*/list ([3ms (nsplit 3 months)] [s (apply map list 3ms)]) (regexp-replace #rx" +" (string-join s "   ") ""))
(λ(s) (equal? "" s)))))

(calendar 1969)


{{out}}

           ,-~~-.___.                                         ----
/ ()=(()   \                                        1969
(   (        0                                       ----
\._\, ,----'
##XXXxxxxxxx
/  ---'~;
/    /~|-
=(   ~~  |
/~~~~~~~~~~~~~~~~~~~~~\
/_______________________\
/_________________________\
/___________________________\
|____________________|
|____________________|
|____________________|
|                    |

January                February                March
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1                      1
5  6  7  8  9 10 11    2  3  4  5  6  7  8    2  3  4  5  6  7  8
12 13 14 15 16 17 18    9 10 11 12 13 14 15    9 10 11 12 13 14 15
19 20 21 22 23 24 25   16 17 18 19 20 21 22   16 17 18 19 20 21 22
26 27 28 29 30 31      23 24 25 26 27 28      23 24 25 26 27 28 29
30 31
April                   May                    June
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                1  2  3    1  2  3  4  5  6  7
6  7  8  9 10 11 12    4  5  6  7  8  9 10    8  9 10 11 12 13 14
13 14 15 16 17 18 19   11 12 13 14 15 16 17   15 16 17 18 19 20 21
20 21 22 23 24 25 26   18 19 20 21 22 23 24   22 23 24 25 26 27 28
27 28 29 30            25 26 27 28 29 30 31   29 30

July                  August               September
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                   1  2       1  2  3  4  5  6
6  7  8  9 10 11 12    3  4  5  6  7  8  9    7  8  9 10 11 12 13
13 14 15 16 17 18 19   10 11 12 13 14 15 16   14 15 16 17 18 19 20
20 21 22 23 24 25 26   17 18 19 20 21 22 23   21 22 23 24 25 26 27
27 28 29 30 31         24 25 26 27 28 29 30   28 29 30
31
October                November               December
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1       1  2  3  4  5  6
5  6  7  8  9 10 11    2  3  4  5  6  7  8    7  8  9 10 11 12 13
12 13 14 15 16 17 18    9 10 11 12 13 14 15   14 15 16 17 18 19 20
19 20 21 22 23 24 25   16 17 18 19 20 21 22   21 22 23 24 25 26 27
26 27 28 29 30 31      23 24 25 26 27 28 29   28 29 30 31
30


## Rebol


do [if "" = y: ask "Year (ENTER for current):^/^/" [prin y: now/year]
foreach m system/locale/months [
prin rejoin ["^/^/     " m "^/^/ "]
foreach day system/locale/days [prin join copy/part day 2 " "]
print ""  f: to-date rejoin ["1-"m"-"y]  loop f/weekday - 1 [prin "   "]
repeat i 31 [
if attempt [c: to-date rejoin [i"-"m"-"y]][
prin join either 1 = length? form i ["  "][" "] i
if c/weekday = 7 [print ""]
]
]
] ask "^/^/Press [ENTER] to Continue..."]



## REXX

Rather than build a program from scratch, I took my generalized REXX program that generated (as an

option) any calendar for any month, and by extension, any number of months (so that an entire

year could be displayed/written). To make the program much smaller, a LOT of code was removed

(but it's still a sledgehammer doing the work of a small hammer).

Some of the code removed: ::* almost all error checking and the issuing of error messages. ::* the option of using "simple" characters as opposed to a true grid (of ASCII extended characters). ::* the option of highlighting of today's date. ::* the option of using colors. ::* the specifying of what lang:uage to use (over 90 languages, default is English). ::* the option of using indentation. ::* the option of using different date formats (to specify the date). ::* the option of using a time addition/subtraction for the date (* -4score-7years). ::* the option of showing the phases of the moon. ::* the option of showing the day-of-the-year (as on financial calendars and others). ::* the option of specifying a calendar fill character (those empty cells in a monthly calender). ::* the option of drawing Snoopy (three versions) and also many other animals/ASCII art. ::* the specifing of alternate outputs (a file/printer/XEDIT/stack/GLOBALVs/etc). ::* the option of displaying the year in blocked form (at the top of the calendar):


11          9999999       6666666       9999999
111         999999999     666666666     999999999
1111        99      99    66      66    99      99
11        99      99    66            99      99
11        99     999    66            99     999
11         999999999    66 666666      999999999
11          99999 99    6666666666      99999 99
11                99    666     66            99
11                99    66      66            99
11        99      99    66      66    99      99
111111       99999999      66666666      99999999
111111        999999        666666        999999



Most of the code is dealing with drawing a cell (grid) for each day-of-the-month, so the program

is a bit more complex than it has to be for this task. Also, it was designed for any year, any

month(s), and any size screen/device to show (display) it. Accommodations were made in the program

to allow the choice of what type of cells would be generated: small/smaller/smallest for height, and

narrow/narrower/narrowest for the width. The size (width/depth) of the output device/terminal can be

specified. The choice could've been performed programmatically, but I never believe that a program

could best choose over what the user wants, as it depends on esthetics and looks (fashion).

/*REXX program to show any year's (monthly) calendar (with/without grid)*/

@abc='abcdefghijklmnopqrstuvwxyz'; @abcU=@abc; upper @abcU
calfill=' '; mc=12; _='1 3 1234567890' "fb"x
parse var _ grid calspaces # chk . cv_ days.1 days.2 days.3 daysn sd sw
_=0; parse var _ cols 1 jd 1 lowerCase 1 maxKalPuts 1 narrow 1,
narrower 1 narrowest 1 short 1 shorter 1 shortest 1,
small 1 smaller 1 smallest 1 upperCase
parse arg mm '/' dd "/" yyyy _ '(' ops;  uops=ops
if _\=='' | \is#(mm) | \is#(dd) | \is#(yyyy) then call erx 86

do while ops\==''; ops=strip(ops,'L'); parse var ops _1 2 1 _ . 1 _o ops
upper _
select
when  abb('CALSPaces')  then calspaces=nai()
when  abb('DEPth')      then        sd=nai()
when abbn('GRIDs')      then      grid=no()
when abbn('LOWercase')  then lowerCase=no()
when  abb('CALMONths')  then        mc=nai()
when abbn('NARrow')     then    narrow=no()
when abbn('NARROWER')   then  narrower=no()
when abbn('NARROWESt')  then narrowest=no()
when abbn('SHORt')      then     short=no()
when abbn('SHORTER')    then   shorter=no()
when abbn('SHORTESt')   then  shortest=no()
when abbn('SMALl')      then     small=no()
when abbn('SMALLER')    then   smaller=no()
when abbn('SMALLESt')   then  smallest=no()
when abbn('UPPercase')  then upperCase=no()
when  abb('WIDth')      then        sw=nai()
otherwise nop
end    /*select*/
end         /*do while opts\== ...*/

mc=int(mc,'monthscalender'); if mc>0 then cal=1
days='Sunday Monday Tuesday Wednesday Thursday Friday Saturday'
months='January February March April May June July August September October November December'
days=' 'days;  months=' 'months
cyyyy=right(date(),4);  hyy=left(cyyyy,2);  lyy=right(cyyyy,2)
dy.=31; _=30; parse var _ dy.4 1 dy.6 1 dy.9 1 dy.11; dy.2=28+ly(yyyy)
yy=right(yyyy,2); sd=p(sd 43); sw=p(sw 80); cw=10; cindent=1; calwidth=76
if small    then do; narrow=1   ; short=1   ; end
if smaller  then do; narrower=1 ; shorter=1 ; end
if smallest then do; narrowest=1; shortest=1; end
if shortest then shorter=1
if shorter  then short  =1
if narrow    then do; cw=9; cindent=3; calwidth=69; end
if narrower  then do; cw=4; cindent=1; calwidth=34; end
if narrowest then do; cw=2; cindent=1; calwidth=20; end
cv_=calwidth+calspaces+2
calfill=left(copies(calfill,cw),cw)
do j=1 for 7;         _=word(days,j)
do jw=1 for 3;  _d=strip(substr(_,cw*jw-cw+1,cw))
if jw=1 then _d=centre(_d,cw+1)
else _d=left(_d,cw+1)
days.jw=days.jw||_d
end   /*jw*/
__=daysn
if narrower  then daysn=__||centre(left(_,3),5)
if narrowest then daysn=__||center(left(_,2),3)
end   /*j*/
_yyyy=yyyy; calPuts=0; cv=1; _mm=mm+0; month=word(months,mm)
dy.2=28+ly(_yyyy); dim=dy._mm; _dd=01; dow=dow(_mm,_dd,_yyyy); $dd=dd+0 /*─────────────────────────────now: the business of the building the cal*/ call calGen do _j=2 to mc if cv_\=='' then do cv=cv+cv_ if cv+cv_>=sw then do; cv=1; call calPut call fcalPuts;call calPb end else calPuts=0 end else do;call calPb;call calPut;call fcalPuts;end _mm=_mm+1; if _mm==13 then do; _mm=1; _yyyy=_yyyy+1; end month=word(months,_mm); dy.2=28+ly(_yyyy); dim=dy._mm dow=dow(_mm,_dd,_yyyy);$dd=0; call calGen
end   /*_j*/
call fcalPuts
return _

/*─────────────────────────────calGen subroutine────────────────────────*/
calGen: cellX=;cellJ=;cellM=;calCells=0;calline=0
call calPut
call calPutl copies('─',calwidth),"┌┐"; call calHd
call calPutl month ' ' _yyyy          ; call calHd
if narrowest | narrower then call calPutl daysn
else do jw=1 for 3
if space(days.jw)\=='' then call calPutl days.jw
end
calft=1; calfb=0
do jf=1 for dow-1; call cellDraw calFill,calFill; end
do jy=1 for dim; call cellDraw jy; end
calfb=1
do 7; call cellDraw calFill,calFill; end
if sd>32 & \shorter then call calPut
return

/*─────────────────────────────cellDraw subroutine──────────────────────*/
cellDraw: parse arg zz,cdDOY;zz=right(zz,2);calCells=calCells+1
if calCells>7 then do
calLine=calLine+1
cellX=substr(cellX,2)
cellJ=substr(cellJ,2)
cellM=substr(cellM,2)
cellB=translate(cellX,,")(─-"#)
if calLine==1 then call cx
call calCsm; call calPutl cellX; call calCsj; call cx
cellX=; cellJ=; cellM=; calCells=1
end
cdDOY=right(cdDOY,cw); cellM=cellM'│'center('',cw)
cellX=cellX'│'centre(zz,cw); cellJ=cellJ'│'center('',cw)
return

/*═════════════════════════════general 1-line subs══════════════════════*/
abb:arg abbu;parse arg abb;return abbrev(abbu,_,abbl(abb))
abbl:return verify(arg(1)'a',@abc,'M')-1
abbn:parse arg abbn;return abb(abbn)|abb('NO'abbn)
calCsj:if sd>49&\shorter then call calPutl cellB;if sd>24&\short then call calPutl cellJ; return
calCsm:if sd>24&\short then call calPutl cellM;if sd>49&\shorter then call calPutl cellB;return
calHd:if sd>24&\shorter then call calPutl;if sd>32&\shortest then call calPutl;return
calPb:if \grid&shortest then call put chk;return
calPut:calPuts=calPuts+1;maxKalPuts=max(maxKalPuts,calPuts);if symbol('CT.'calPuts)\=='VAR' then ct.calPuts=;ct.calPuts=overlay(arg(1),ct.calPuts,cv);return
calPutl:call calPut copies(' ',cindent)left(arg(2)"│",1)center(arg(1),calwidth)||right('│'arg(2),1);return
cx:cx_='├┤';cx=copies(copies('─',cw)'┼',7);if calft then do;cx=translate(cx,'┬',"┼");calft=0;end;if calfb then do;cx=translate(cx,'┴',"┼");cx_='└┘';calfb=0;end;call calPutl cx,cx_;return
dow:procedure;arg m,d,y;if m<3 then do;m=m+12;y=y-1;end;yl=left(y,2);yr=right(y,2);w=(d+(m+1)*26%10+yr+yr%4+yl%4+5*yl)//7;if w==0 then w=7;return w
er:parse arg _1,_2;call '$ERR' "14"p(_1) p(word(_1,2) !fid(1)) _2;if _1<0 then return _1;exit result err:call er '-'arg(1),arg(2);return '' erx:call er '-'arg(1),arg(2);exit '' fcalPuts: do j=1 for maxKalPuts;call put ct.j;end;ct.=;maxKalPuts=0;calPuts=0;return int:int=numx(arg(1),arg(2));if \isint(int) then call erx 92,arg(1) arg(2);return int/1 is#:return verify(arg(1),#)==0 isint:return datatype(arg(1),'W') lower:return translate(arg(1),@abc,@abcU) ly:arg _;if length(_)==2 then _=hyy||_;ly=_//4==0;if ly==0 then return 0;ly=((_//100\==0)|_//400==0);return ly na:if arg(1)\=='' then call erx 01,arg(2);parse var ops na ops;if na=='' then call erx 35,_o;return na nai:return int(na(),_o) nan:return numx(na(),_o) no:if arg(1)\=='' then call erx 01,arg(2);return left(_,2)\=='NO' num:procedure;parse arg x .,f,q;if x=='' then return x;if datatype(x,'N') then return x/1;x=space(translate(x,,','),0);if datatype(x,'N') then return x/1;return numnot() numnot:if q==1 then return x;if q=='' then call er 53,x f;call erx 53,x f numx:return num(arg(1),arg(2),1) p:return word(arg(1),1) put:_=arg(1);_=translate(_,,'_'chk);if \grid then _=ungrid(_);if lowerCase then _=lower(_);if upperCase then upper _;if shortest&_=' ' then return;call tell _;return tell:say arg(1);return ungrid:return translate(arg(1),,"│║─═┤┐└┴┬├┼┘┌╔╗╚╝╟╢╞╡╫╪╤╧╥╨╠╣")  '''output''' when using the input of: 1/1/1969 (noGrid smallest narrowest)  «Snoopy "picture" here» January 1969 February 1969 March 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April 1969 May 1969 June 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July 1969 August 1969 September 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October 1969 November 1969 December 1969 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  Output when using the input of: 1/1/1969 (smallest narrowest width 156 calSpaces 5) A width of 156 was used to illustrate showing a grid, otherwise it would fit in 132 columns.  ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ │ January 1969 │ │ February 1969 │ │ March 1969 │ │ April 1969 │ │ May 1969 │ │ June 1969 │ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ │ │ │ │ 1│ 2│ 3│ 4│ │ │ │ │ │ │ │ 1│ │ │ │ │ │ │ │ 1│ │ │ │ 1│ 2│ 3│ 4│ 5│ │ │ │ │ │ 1│ 2│ 3│ │ 1│ 2│ 3│ 4│ 5│ 6│ 7│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │ 5│ 6│ 7│ 8│ 9│10│11│ │ 2│ 3│ 4│ 5│ 6│ 7│ 8│ │ 2│ 3│ 4│ 5│ 6│ 7│ 8│ │ 6│ 7│ 8│ 9│10│11│12│ │ 4│ 5│ 6│ 7│ 8│ 9│10│ │ 8│ 9│10│11│12│13│14│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │12│13│14│15│16│17│18│ │ 9│10│11│12│13│14│15│ │ 9│10│11│12│13│14│15│ │13│14│15│16│17│18│19│ │11│12│13│14│15│16│17│ │15│16│17│18│19│20│21│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │19│20│21│22│23│24│25│ │16│17│18│19│20│21│22│ │16│17│18│19│20│21│22│ │20│21│22│23│24│25│26│ │18│19│20│21│22│23│24│ │22│23│24│25│26│27│28│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │26│27│28│29│30│31│ │ │23│24│25│26│27│28│ │ │23│24│25│26│27│28│29│ │27│28│29│30│ │ │ │ │25│26│27│28│29│30│31│ │29│30│ │ │ │ │ │ └──┴──┴──┴──┴──┴──┴──┘ └──┴──┴──┴──┴──┴──┴──┘ ├──┼──┼──┼──┼──┼──┼──┤ └──┴──┴──┴──┴──┴──┴──┘ └──┴──┴──┴──┴──┴──┴──┘ └──┴──┴──┴──┴──┴──┴──┘ │30│31│ │ │ │ │ │ └──┴──┴──┴──┴──┴──┴──┘ ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ ┌────────────────────┐ │ July 1969 │ │ August 1969 │ │ September 1969 │ │ October 1969 │ │ November 1969 │ │ December 1969 │ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ │Su Mo Tu We Th Fr Sa│ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ ├──┬──┬──┬──┬──┬──┬──┤ │ │ │ 1│ 2│ 3│ 4│ 5│ │ │ │ │ │ │ 1│ 2│ │ │ 1│ 2│ 3│ 4│ 5│ 6│ │ │ │ │ 1│ 2│ 3│ 4│ │ │ │ │ │ │ │ 1│ │ │ 1│ 2│ 3│ 4│ 5│ 6│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │ 6│ 7│ 8│ 9│10│11│12│ │ 3│ 4│ 5│ 6│ 7│ 8│ 9│ │ 7│ 8│ 9│10│11│12│13│ │ 5│ 6│ 7│ 8│ 9│10│11│ │ 2│ 3│ 4│ 5│ 6│ 7│ 8│ │ 7│ 8│ 9│10│11│12│13│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │13│14│15│16│17│18│19│ │10│11│12│13│14│15│16│ │14│15│16│17│18│19│20│ │12│13│14│15│16│17│18│ │ 9│10│11│12│13│14│15│ │14│15│16│17│18│19│20│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │20│21│22│23│24│25│26│ │17│18│19│20│21│22│23│ │21│22│23│24│25│26│27│ │19│20│21│22│23│24│25│ │16│17│18│19│20│21│22│ │21│22│23│24│25│26│27│ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ ├──┼──┼──┼──┼──┼──┼──┤ │27│28│29│30│31│ │ │ │24│25│26│27│28│29│30│ │28│29│30│ │ │ │ │ │26│27│28│29│30│31│ │ │23│24│25│26│27│28│29│ │28│29│30│31│ │ │ │ └──┴──┴──┴──┴──┴──┴──┘ ├──┼──┼──┼──┼──┼──┼──┤ └──┴──┴──┴──┴──┴──┴──┘ └──┴──┴──┴──┴──┴──┴──┘ ├──┼──┼──┼──┼──┼──┼──┤ └──┴──┴──┴──┴──┴──┴──┘ │31│ │ │ │ │ │ │ │30│ │ │ │ │ │ │ └──┴──┴──┴──┴──┴──┴──┘ └──┴──┴──┴──┴──┴──┴──┘ ,-~~-.___. / ()=(() \ ( ( 0 \._\, ,----' ##XXXxxxxxxx / ---'~; / /~|- _____=( ~~ |______ /_____________________\ /_______________________\ /_________________________\ /___________________________\ |____________________| |____________________| |____________________| | |  ## Ring  # Project : Calendar load "guilib.ring" load "stdlib.ring" new qapp { win1 = new qwidget() { day = list(12) pos = newlist(12,37) month = list(12) week = list(7) weekday = list(7) button = newlist(7,6) monthsnames = list(12) week = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"] months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"] daysnew = [[5,1], [6,2], [7,3], [1,4], [2,5], [3,6], [4,7]] mo = [4,0,0,3,5,1,3,6,2,4,0,2] mon = [31,28,31,30,31,30,31,31,30,31,30,31] m2 = (((1969-1900)%7) + floor((1969 - 1900)/4) % 7) % 7 for n = 1 to 12 month[n] = (mo[n] + m2) % 7 x = (month[n] + 1) % 7 + 1 for m = 1 to len(daysnew) if daysnew[m][1] = x nr = m ok next day[n] = daysnew[nr][2] next for m = 1 to 12 for n = 1 to day[m] - 1 pos[m][n] = " " next next for m = 1 to 12 for n = day[m] to 37 if n < (mon[m] + day[m]) pos[m][n] = n - day[m] + 1 else pos[m][n] = " " ok next next setwindowtitle("Calendar") setgeometry(100,100,650,800) label1 = new qlabel(win1) { setgeometry(10,10,800,600) settext("") } year = new qpushbutton(win1) { setgeometry(280,20,60,20) year.settext("1969") } for n = 1 to 4 nr = (n-1)*3+1 showmonths(nr) next for n = 1 to 12 showweeks(n) next for n = 1 to 12 showdays(n) next show() } exec() } func showmonths(m) for n = m to m + 2 monthsnames[n] = new qpushbutton(win1) { if n%3 = 1 col = 120 rownr = floor(n/3) if rownr = 0 rownr = n/3 ok if n = 1 row = 40 else row = 40+rownr*180 ok else colnr = n%3 if colnr = 0 colnr = 3 ok rownr = floor(n/3) if n%3 = 0 rownr = floor(n/3)-1 ok col = 120 + (colnr-1)*160 row = 40 + rownr*180 ok setgeometry(col,row,60,20) monthsnames[n].settext(months[n]) } next func showweeks(n) for m = 1 to 7 col = m%7 if col = 0 col = 7 ok weekday[m] = new qpushbutton(win1) { colnr = n % 3 if colnr = 0 colnr = 3 ok rownr = floor(n/3) if n%3 = 0 rownr = floor(n/3)-1 ok colbegin = 60 + (colnr-1)*160 rowbegin = 60 + (rownr)*180 setgeometry(colbegin+col*20,rowbegin,20,20) weekday[m].settext(week[m]) } next func showdays(ind) rownr = floor(ind/3) if ind%3 = 0 rownr = floor(ind/3)-1 ok rowbegin = 60+rownr*180 for m = 1 to 6 for n = 1 to 7 col = n%7 if col = 0 col = 7 ok row = m button[n][m] = new qpushbutton(win1) { if ind%3 = 1 colbegin = 60 elseif ind%3 = 2 colbegin = 220 else colbegin = 380 ok setgeometry(colbegin+col*20,rowbegin+row*20,20,20) nr = (m-1)*7+n if nr <= 37 if pos[ind][nr] != " " button[n][m].settext(string(pos[ind][nr])) ok ok } next next  Output image: [https://www.dropbox.com/s/sj37yypiq45o5cd/CalmoSoftCalendar.jpg?dl=0 Calendar] ## Ruby Date class, from the standard library, knows how many days in a month, and which day is Sunday, for both Julian and Gregorian calendars. This program uses Date class, plus its own assumptions, to create the calendar. This program assumes that every year has 12 months and starts with January 1, and every month fits in 6 weeks starting with Sunday. require 'date' # Creates a calendar of _year_. Returns this calendar as a multi-line # string fit to _columns_. def cal(year, columns) # Start at January 1. # # Date::ENGLAND marks the switch from Julian calendar to Gregorian # calendar at 1752 September 14. This removes September 3 to 13 from # year 1752. (By fortune, it keeps January 1.) # date = Date.new(year, 1, 1, Date::ENGLAND) # Collect calendars of all 12 months. months = (1..12).collect do |month| rows = [Date::MONTHNAMES[month].center(20), "Su Mo Tu We Th Fr Sa"] # Make array of 42 days, starting with Sunday. days = [] date.wday.times { days.push " " } while date.month == month days.push("%2d" % date.mday) date += 1 end (42 - days.length).times { days.push " " } days.each_slice(7) { |week| rows.push(week.join " ") } next rows end # Calculate months per row (mpr). # 1. Divide columns by 22 columns per month, rounded down. (Pretend # to have 2 extra columns; last month uses only 20 columns.) # 2. Decrease mpr if 12 months would fit in the same months per # column (mpc). For example, if we can fit 5 mpr and 3 mpc, then # we use 4 mpr and 3 mpc. mpr = (columns + 2).div 22 mpr = 12.div((12 + mpr - 1).div mpr) # Use 20 columns per month + 2 spaces between months. width = mpr * 22 - 2 # Join months into calendar. rows = ["[Snoopy]".center(width), "#{year}".center(width)] months.each_slice(mpr) do |slice| slice[0].each_index do |i| rows.push(slice.map {|a| a[i]}.join " ") end end return rows.join("\n") end ARGV.length == 1 or abort "usage: #{$0} year"

# Guess width of terminal.
#  1. Obey environment variable COLUMNS.
#  2. Try to require 'io/console' from Ruby 1.9.3.
#  3. Try to run tput co.
#  4. Assume 80 columns.
columns = begin Integer(ENV["COLUMNS"] || "")
rescue
begin require 'io/console'; IO.console.winsize[1]
begin Integer(tput cols)
rescue
80; end; end; end

puts cal(Integer(ARGV[0]), columns)


Here is 1969 in 132 columns.

$ruby cal.rb 1969 [Snoopy] 1969 January February March April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31 29 30 30 31 July August September October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 1 2 3 4 1 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 31 30  The output in 80 columns for the Gregorian reform year (note missing days in september):  [Snoopy] 1752 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 7 5 6 7 8 9 10 11 2 3 4 5 6 7 8 8 9 10 11 12 13 14 12 13 14 15 16 17 18 9 10 11 12 13 14 15 15 16 17 18 19 20 21 19 20 21 22 23 24 25 16 17 18 19 20 21 22 22 23 24 25 26 27 28 26 27 28 29 30 31 23 24 25 26 27 28 29 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 2 1 2 3 4 5 6 5 6 7 8 9 10 11 3 4 5 6 7 8 9 7 8 9 10 11 12 13 12 13 14 15 16 17 18 10 11 12 13 14 15 16 14 15 16 17 18 19 20 19 20 21 22 23 24 25 17 18 19 20 21 22 23 21 22 23 24 25 26 27 26 27 28 29 30 24 25 26 27 28 29 30 28 29 30 31 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 14 15 16 5 6 7 8 9 10 11 2 3 4 5 6 7 8 17 18 19 20 21 22 23 12 13 14 15 16 17 18 9 10 11 12 13 14 15 24 25 26 27 28 29 30 19 20 21 22 23 24 25 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 1 2 3 4 1 2 8 9 10 11 12 13 14 5 6 7 8 9 10 11 3 4 5 6 7 8 9 15 16 17 18 19 20 21 12 13 14 15 16 17 18 10 11 12 13 14 15 16 22 23 24 25 26 27 28 19 20 21 22 23 24 25 17 18 19 20 21 22 23 29 30 31 26 27 28 29 30 24 25 26 27 28 29 30 31  ## Rust // Assume your binary name is 'calendar'. // Command line: // >>$ calendar 2019 150
// First argument: year number.
// Second argument (optional): text area width (in characters).

extern crate chrono;

use std::{env, cmp};
use chrono::{NaiveDate, Datelike};

const MONTH_WIDTH: usize = 22;

const DAYS_OF_WEEK: &str = "SU MO TU WE TH FR SA  ";
println!();
for m in months {
print!("{:^20}  ", m);
}
println!("\n{}", DAYS_OF_WEEK.repeat(months.len()));
}

fn get_week_str(days: i32, week_num: i32, start_day_of_week: i32) -> Option<String> {
let start = week_num * 7 - start_day_of_week + 1;
let end = (week_num + 1) * 7 - start_day_of_week;
let mut ret = String::with_capacity(MONTH_WIDTH);
if start > days {
None
} else {
for i in start..(end + 1) {
if i <= 0 || i > days {
ret.push_str("  ");
} else {
if i < 10 {
ret.push_str(" ");
}
ret.push_str(&i.to_string());
}
ret.push_str(" ");
}
ret.push_str(" ");
Some(ret)
}
}

fn main() {
const MONTH_NAMES: [&str; 12] = ["JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY",
"AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER"];
const DEFAULT_TEXT_WIDTH: usize = 100;

let args: Vec<String> = env::args().collect();
let year: i32 = args[1].parse().expect("The first argument must be a year");
let width: usize = if args.len() > 2 {
cmp::max(MONTH_WIDTH, args[2].parse().expect("The second argument should be text width"))
} else {
DEFAULT_TEXT_WIDTH
};
let months_in_row = width / MONTH_WIDTH;
let month_rows = if MONTH_NAMES.len() % months_in_row == 0 {
MONTH_NAMES.len() / months_in_row
} else {
MONTH_NAMES.len() / months_in_row + 1
};

let start_days_of_week: Vec<i32> =
(1..13).map(|x| NaiveDate::from_ymd(year, x, 1).weekday().num_days_from_sunday() as i32).collect();

let month_days: [i32; 12] = if NaiveDate::from_ymd_opt(year, 2, 29).is_some() {
[31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
} else {
[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
};

println!("{year:^w$}", w=width, year=year.to_string()); for i in 0..month_rows { let start = i * months_in_row; let end = cmp::min((i + 1) * months_in_row, MONTH_NAMES.len()); print_header(&MONTH_NAMES[start..end]); let mut count = 0; let mut row_num = 0; while count < months_in_row { let mut row_str = String::with_capacity(width); for j in start..end { match get_week_str(month_days[j], row_num, start_days_of_week[j]) { None => { count += 1; row_str.push_str(&" ".repeat(MONTH_WIDTH)); }, Some(week_str) => row_str.push_str(&week_str) } } if count < months_in_row { println!("{}", row_str); } row_num += 1; } } }  ## Scala {{libheader|Scala}} ### Scala Version 1 [[Category:Scala examples needing attention]] import java.util.{ Calendar, GregorianCalendar } import language.postfixOps import collection.mutable.ListBuffer object CalendarPrint extends App { val locd = java.util.Locale.getDefault() val cal = new GregorianCalendar val monthsMax = cal.getMaximum(Calendar.MONTH) def JDKweekDaysToISO(dn: Int) = { val nday = dn - Calendar.MONDAY if (nday < 0) (dn + Calendar.THURSDAY) else nday } def daysInMonth(year: Int, monthMinusOne: Int): Int = { cal.set(year, monthMinusOne, 1) cal.getActualMaximum(Calendar.DAY_OF_MONTH) } def namesOfMonths() = { def f1(i: Int): String = { cal.set(2013, i, 1) cal.getDisplayName(Calendar.MONTH, Calendar.LONG, locd) } (0 to monthsMax) map f1 } def offsets(year: Int): List[Int] = { val months = cal.getMaximum(Calendar.MONTH) def get1stDayOfWeek(i: Int) = { cal.set(year, i, 1) cal.get(Calendar.DAY_OF_WEEK) } (0 to monthsMax).toList map get1stDayOfWeek map { i => JDKweekDaysToISO(i) } } def headerNameOfDays() = { val mdow = cal.getDisplayNames(Calendar.DAY_OF_WEEK, Calendar.SHORT, locd) // map days of week val it = mdow.keySet.iterator val keySet = new ListBuffer[String] while (it.hasNext) keySet += it.next (keySet.map { key => (JDKweekDaysToISO(mdow.get(key)), key.take(2)) }.sortWith(_._1 < _._1) map (_._2)).mkString(" ") } def getGregCal(year: Int) = { { def dayOfMonth(month: Int) = new Iterator[(Int, Int)] { cal.set(year, month, 1) var ldom = 0 def next() = { val res = (cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH)) ldom = res._2 cal.roll(Calendar.DAY_OF_MONTH, true) res } def hasNext() = (cal.get(Calendar.DAY_OF_MONTH) > ldom) } var ret: List[(Int, Int)] = Nil for (i <- 0 to monthsMax) ret = ret ++ (dayOfMonth(i).toSeq) (ret, offsets(year)) } } def printCalendar(calendar: (List[(Int, Int)], List[Int]), headerList: List[String] = Nil, printerWidth: Int = 80) = { val mw = 20 // month width val gwf = 2 // gap width fixed val gwm = 2 // gap width minimum val fgw = true val arr = Array.ofDim[String](6, 7) def limits(printerWidth: Int): (Int, Int, Int, Int, Int) = { val pw = if (printerWidth < 20) 20 else if (printerWidth > 300) 300 else printerWidth // months side by side, gaps sum minimum val (msbs, gsm) = { val x1 = { val c = if (pw / mw > 12) 12 else pw / mw val a = (c - 1) if (c * mw + a * gwm <= pw) c else a } match { case 5 => 4 case a if (a > 6 && a < 12) => 6 case other => other } (x1, (x1 - 1) * gwm) } def getFGW(msbs: Int, gsm: Int) = { val r = (pw - msbs * mw - gsm) / 2; (r, gwf, r) } // fixed gap width def getVGW(msbs: Int, gsm: Int) = pw - msbs * mw - gsm match { // variable gap width case a if (a < 2 * gwm) => (a / 2, gwm, a / 2) case b => { val x = (b + gsm) / (msbs + 1); (x, x, x) } } // left margin, gap width, right margin val (lm, gw, rm) = if (fgw) getFGW(msbs, gsm) else getVGW(msbs, gsm) (pw, msbs, lm, gw, rm) } // def limits( val (pw, msbs, lm, gw, rm) = limits(printerWidth) val monthsList = (0 to monthsMax).map { m => calendar._1.filter { _._1 == m } } val nom = namesOfMonths() val hnod = headerNameOfDays def fsplit(list: List[(Int, Int)]): List[String] = { def fap(p: Int) = (p / 7, p % 7) for (i <- 0 until 6) for (j <- 0 until 7) arr(i)(j) = " " for (i <- 0 until list.size) arr(fap(i + calendar._2(list(i)._1))._1)(fap(i + calendar._2(list(i)._1))._2) = f"${(list(i)._2)}%2d"
arr.toList.map(_.foldRight("")(_ + " " + _))
}
val monthsRows = monthsList.map(fsplit)

def center(s: String, l: Int): String = {
(if (s.size >= l) s
else " " * ((l - s.size) / 2) + s + " " * ((l - s.size) / 2) + " ").substring(0, l)
}

val maxMonths = monthsMax + 1

val rowblocks = (1 to maxMonths / msbs).map { i =>
(0 to 5).map { j =>
val lb = new ListBuffer[String]
val k = (i - 1) * msbs
(k to k + msbs - 1).map { l => lb += monthsRows(l)(j) }
lb
}
}

val mheaders = (1 to maxMonths / msbs).
map { i => (0 to msbs - 1).map { j => center(nom(j + (i - 1) * msbs), 20) } }
val dowheaders = (1 to maxMonths / msbs).
map { i => (0 to msbs - 1).map { j => center(hnod, 20) } }

headerList.foreach(xs => println(center(xs + '\n', pw)))
(1 to 12 / msbs).foreach { i =>
println(" " * lm + mheaders(i - 1).foldRight("")(_ + " " * gw + _))
println(" " * lm + dowheaders(i - 1).foldRight("")(_ + " " * gw + _))
rowblocks(i - 1).foreach { xs => println(" " * lm + xs.foldRight("")(_ + " " * (gw - 1) + _)) }
println
}
} //  def printCal(

printCalendar(getGregCal(1969), List("[Snoopy Picture]", "1969"))
printCalendar(getGregCal(1582), List("[Snoopy Picture]", "1582"), printerWidth = 132)
}


{{out}}

                               [Snoopy Picture]

1969

January               February               March
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5                  1  2                  1  2
6  7  8  9 10 11 12   3  4  5  6  7  8  9   3  4  5  6  7  8  9
13 14 15 16 17 18 19  10 11 12 13 14 15 16  10 11 12 13 14 15 16
20 21 22 23 24 25 26  17 18 19 20 21 22 23  17 18 19 20 21 22 23
27 28 29 30 31        24 25 26 27 28        24 25 26 27 28 29 30
31

April                  May                   June
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5  6            1  2  3  4                     1
7  8  9 10 11 12 13   5  6  7  8  9 10 11   2  3  4  5  6  7  8
14 15 16 17 18 19 20  12 13 14 15 16 17 18   9 10 11 12 13 14 15
21 22 23 24 25 26 27  19 20 21 22 23 24 25  16 17 18 19 20 21 22
28 29 30              26 27 28 29 30 31     23 24 25 26 27 28 29
30

July                 August              September
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5  6               1  2  3   1  2  3  4  5  6  7
7  8  9 10 11 12 13   4  5  6  7  8  9 10   8  9 10 11 12 13 14
14 15 16 17 18 19 20  11 12 13 14 15 16 17  15 16 17 18 19 20 21
21 22 23 24 25 26 27  18 19 20 21 22 23 24  22 23 24 25 26 27 28
28 29 30 31           25 26 27 28 29 30 31  29 30

October               November              December
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5                  1  2   1  2  3  4  5  6  7
6  7  8  9 10 11 12   3  4  5  6  7  8  9   8  9 10 11 12 13 14
13 14 15 16 17 18 19  10 11 12 13 14 15 16  15 16 17 18 19 20 21
20 21 22 23 24 25 26  17 18 19 20 21 22 23  22 23 24 25 26 27 28
27 28 29 30 31        24 25 26 27 28 29 30  29 30 31

[Snoopy Picture]

1582

January               February               March                 April                  May                   June
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1  2  3  4  5  6  7            1  2  3  4            1  2  3  4                     1      1  2  3  4  5  6               1  2  3
8  9 10 11 12 13 14   5  6  7  8  9 10 11   5  6  7  8  9 10 11   2  3  4  5  6  7  8   7  8  9 10 11 12 13   4  5  6  7  8  9 10
15 16 17 18 19 20 21  12 13 14 15 16 17 18  12 13 14 15 16 17 18   9 10 11 12 13 14 15  14 15 16 17 18 19 20  11 12 13 14 15 16 17
22 23 24 25 26 27 28  19 20 21 22 23 24 25  19 20 21 22 23 24 25  16 17 18 19 20 21 22  21 22 23 24 25 26 27  18 19 20 21 22 23 24
29 30 31              26 27 28              26 27 28 29 30 31     23 24 25 26 27 28 29  28 29 30 31           25 26 27 28 29 30
30

July                 August              September              October               November              December
Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su  Mo Tu We Th Fr Sa Su
1         1  2  3  4  5                  1  2   1  2  3  4 15 16 17   1  2  3  4  5  6  7         1  2  3  4  5
2  3  4  5  6  7  8   6  7  8  9 10 11 12   3  4  5  6  7  8  9  18 19 20 21 22 23 24   8  9 10 11 12 13 14   6  7  8  9 10 11 12
9 10 11 12 13 14 15  13 14 15 16 17 18 19  10 11 12 13 14 15 16  25 26 27 28 29 30 31  15 16 17 18 19 20 21  13 14 15 16 17 18 19
16 17 18 19 20 21 22  20 21 22 23 24 25 26  17 18 19 20 21 22 23                        22 23 24 25 26 27 28  20 21 22 23 24 25 26
23 24 25 26 27 28 29  27 28 29 30 31        24 25 26 27 28 29 30                        29 30                 27 28 29 30 31
30 31



###  Scala Version 2

{{works with|Scala|2.10.1}}

Scala
/**
* Loosely based on the Ruby implementation.
*
* Focuses on immutability and Scala idioms,
* while trying to remain readable and clean.
*/
object YearCalendarApp extends App with Extras {

val defaultYear = 1752
val columns = 86

yearCalendarLines(year, columns).foreach(println)

def yearCalendarLines(year: Int, columns: Int): Seq[String] = {
// At least one. Divide rest columns by width + 2 spaces (separator)
val calendarsPerRow = 1 + (columns - 20) / (20 + 2)

// Use 20 columns per month + 2 spaces between months
val width = calendarsPerRow * 22 - 2

List(
"[Snoopy]".center(width),
s"${year}".center(width)) ++ // Get, group, transpose and join calendar lines allMonthCalendarLines(year).grouped(calendarsPerRow).flatMap { calGroup => calGroup.transpose.map(stringsInRow => stringsInRow.mkString(" ")) } } def allMonthCalendarLines(year: Int): Seq[Seq[String]] = { (1 to 12).map { monthNr => val date = MonthCalendar(monthInYear = monthNr, year) // Make array of 42 days (7 * 6 weeks max.) starting with Sunday (which is 0) val daySlotsInMonth = { (Seq().padTo(date.dayOfWeek, " ") ++ date.daysInMonth.map { dayNr => "%2d".format(dayNr) }). padTo(42, " ") } List( date.monthName.center(20), "Su Mo Tu We Th Fr Sa") ++ daySlotsInMonth.grouped(7).map { weekSlots => weekSlots.mkString(" ") } } } }  Scala /** * This provides extra classes needed for the main * algorithm. */ trait Extras { import java.util.Calendar import java.util.GregorianCalendar import java.text.SimpleDateFormat import java.util.Locale import scala.collection.mutable.Buffer implicit class MyString(str: String) { def center(width: Int): String = { val leftSpaces = (width / 2) - (str.length() / 2) val rightSpaces = width - (leftSpaces + str.length) (" " * leftSpaces) + str + (" " * rightSpaces) } } case class MonthCalendar(monthInYear: Int, year: Int) { private val javaCalendar = makeJavaCalendar(year, monthInYear) private def makeJavaCalendar(year: Int, monthInYear: Int): Calendar = { val calendar = new GregorianCalendar() // Actually, other countries changed already in 1582, // which is the JDK's default implementation. val gregorianDateChangeInEngland = { val d = Calendar.getInstance() d.set(1752, Calendar.SEPTEMBER, 14) d.getTime() } // For England we need to set this explicitly. calendar.setGregorianChange(gregorianDateChangeInEngland) calendar.set(Calendar.DAY_OF_MONTH, 1) calendar.set(Calendar.YEAR, year) calendar.set(Calendar.MONTH, monthInYear - 1) calendar } val monthName = javaCalendar.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.ENGLISH) val dayOfWeek = javaCalendar.get(Calendar.DAY_OF_WEEK) - 1 val daysInMonth = { val tempCal = makeJavaCalendar(year, monthInYear) val dayNumbers = Buffer[Int]() while (tempCal.get(Calendar.MONTH) == monthInYear - 1) { dayNumbers += tempCal.get(Calendar.DAY_OF_MONTH) tempCal.add(Calendar.DATE, 1) } dayNumbers } } }  Sample output for 1792: txt [Snoopy] 1752 January February March April Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 10 11 2 3 4 5 6 7 8 8 9 10 11 12 13 14 5 6 7 8 9 10 11 12 13 14 15 16 17 18 9 10 11 12 13 14 15 15 16 17 18 19 20 21 12 13 14 15 16 17 18 19 20 21 22 23 24 25 16 17 18 19 20 21 22 22 23 24 25 26 27 28 19 20 21 22 23 24 25 26 27 28 29 30 31 23 24 25 26 27 28 29 29 30 31 26 27 28 29 30 May June July August Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 1 2 3 4 5 6 1 2 3 4 1 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 31 30 31 September October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 14 15 16 1 2 3 4 5 6 7 1 2 3 4 1 2 17 18 19 20 21 22 23 8 9 10 11 12 13 14 5 6 7 8 9 10 11 3 4 5 6 7 8 9 24 25 26 27 28 29 30 15 16 17 18 19 20 21 12 13 14 15 16 17 18 10 11 12 13 14 15 16 22 23 24 25 26 27 28 19 20 21 22 23 24 25 17 18 19 20 21 22 23 29 30 31 26 27 28 29 30 24 25 26 27 28 29 30 31  ## Seed7 seed7$ include "seed7_05.s7i";
include "time.s7i";

const func string: center (in string: stri, in integer: length) is
return ("" lpad (length - length(stri)) div 2 <& stri) rpad length;

const proc: printCalendar (in integer: year, in integer: cols) is func
local
var time: date is time.value;
var integer: dayOfWeek is 0;
const array string: monthNames is [] ("January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December");
var array array string: monthTable is 12 times 9 times "";
var string: str is "";
var integer: month is 0;
var integer: position is 0;
var integer: row is 0;
var integer: column is 0;
var integer: line is 0;
begin
for month range 1 to 12 do
monthTable[month][1] := " " & center(monthNames[month], 20);
monthTable[month][2] := " Mo Tu We Th Fr Sa Su";
date := date(year, month, 1);
dayOfWeek := dayOfWeek(date);
for position range 1 to 43 do
if position >= dayOfWeek and position - dayOfWeek < daysInMonth(date.year, date.month) then
str := succ(position - dayOfWeek) lpad 3;
else
end if;
monthTable[month][3 + pred(position) div 7] &:= str;
end for;
end for;
writeln(center("[Snoopy Picture]", cols * 24 + 4));
writeln(center(str(year),cols * 24 + 4));
writeln;
for row range 1 to succ(11 div cols) do
for line range 1 to 9 do
for column range 1 to cols do
if pred(row) * cols + column <= 12 then
write("   " & monthTable[pred(row) * cols + column][line]);
end if;
end for;
writeln;
end for;
end for;
end func;

const proc: main is func
begin
printCalendar(1969, 3);
end func;


Original source: [http://seed7.sourceforge.net/algorith/date.htm#calendar]

The output of this program is:

txt

[Snoopy Picture]
1969

January                 February                 March
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5                    1  2                    1  2
6  7  8  9 10 11 12     3  4  5  6  7  8  9     3  4  5  6  7  8  9
13 14 15 16 17 18 19    10 11 12 13 14 15 16    10 11 12 13 14 15 16
20 21 22 23 24 25 26    17 18 19 20 21 22 23    17 18 19 20 21 22 23
27 28 29 30 31          24 25 26 27 28          24 25 26 27 28 29 30
31

April                    May                     June
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5  6              1  2  3  4                       1
7  8  9 10 11 12 13     5  6  7  8  9 10 11     2  3  4  5  6  7  8
14 15 16 17 18 19 20    12 13 14 15 16 17 18     9 10 11 12 13 14 15
21 22 23 24 25 26 27    19 20 21 22 23 24 25    16 17 18 19 20 21 22
28 29 30                26 27 28 29 30 31       23 24 25 26 27 28 29
30

July                   August                September
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5  6                 1  2  3     1  2  3  4  5  6  7
7  8  9 10 11 12 13     4  5  6  7  8  9 10     8  9 10 11 12 13 14
14 15 16 17 18 19 20    11 12 13 14 15 16 17    15 16 17 18 19 20 21
21 22 23 24 25 26 27    18 19 20 21 22 23 24    22 23 24 25 26 27 28
28 29 30 31             25 26 27 28 29 30 31    29 30

October                 November                December
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5                    1  2     1  2  3  4  5  6  7
6  7  8  9 10 11 12     3  4  5  6  7  8  9     8  9 10 11 12 13 14
13 14 15 16 17 18 19    10 11 12 13 14 15 16    15 16 17 18 19 20 21
20 21 22 23 24 25 26    17 18 19 20 21 22 23    22 23 24 25 26 27 28
27 28 29 30 31          24 25 26 27 28 29 30    29 30 31



## Sidef

{{trans|Perl 6}}

ruby
require('DateTime')

define months_per_col = 3
define week_day_names =
define month_names =

func fmt_month (year, month) {
var str = sprintf("%-20s\n", month_names[month-1])
str += week_day_names.join(' ')+"\n"

var dt = %s
var date = dt.new(year => year, month => month)
var week_day = date.day_of_week
str += (week_day-1 of "  " -> join(" "))

var last_day = dt.last_day_of_month(year => year, month => month).day
for day (date.day .. last_day) {
date = dt.new(year => year, month => month, day => day)
str += " " if (week_day ~~ (2..7))
if (week_day == 8) {
str += "\n"
week_day = 1
}
str += sprintf("%2d", day)
++week_day
}
str += " " if (week_day < 8)
str += (8-week_day of "  " -> join(" "))
str += "\n"
}

func fmt_year (year) {
var month_strs = 12.of {|i| fmt_month(year, i+1).lines }

var str = (' '*30 + year + "\n")
for month (0..11 by months_per_col) {
while (month_strs[month]) {
for i (1..months_per_col) {
month_strs[month + i - 1] || next
str += month_strs[month + i - 1].shift
str += ' '*3
}
str += "\n"
}
str += "\n"
}

return str
}

print fmt_year(ARGV ? Number(ARGV[0]) : 1969)


{{out}}

txt

1969
Jan                    Feb                    Mar
Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su
1  2  3  4  5                   1  2                   1  2
6  7  8  9 10 11 12    3  4  5  6  7  8  9    3  4  5  6  7  8  9
13 14 15 16 17 18 19   10 11 12 13 14 15 16   10 11 12 13 14 15 16
20 21 22 23 24 25 26   17 18 19 20 21 22 23   17 18 19 20 21 22 23
27 28 29 30 31         24 25 26 27 28         24 25 26 27 28 29 30

Apr                    May                    Jun
Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su
1  2  3  4  5  6             1  2  3  4                      1
7  8  9 10 11 12 13    5  6  7  8  9 10 11    2  3  4  5  6  7  8
14 15 16 17 18 19 20   12 13 14 15 16 17 18    9 10 11 12 13 14 15
21 22 23 24 25 26 27   19 20 21 22 23 24 25   16 17 18 19 20 21 22
28 29 30               26 27 28 29 30 31      23 24 25 26 27 28 29

Jul                    Aug                    Sep
Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su
1  2  3  4  5  6                1  2  3    1  2  3  4  5  6  7
7  8  9 10 11 12 13    4  5  6  7  8  9 10    8  9 10 11 12 13 14
14 15 16 17 18 19 20   11 12 13 14 15 16 17   15 16 17 18 19 20 21
21 22 23 24 25 26 27   18 19 20 21 22 23 24   22 23 24 25 26 27 28
28 29 30 31            25 26 27 28 29 30 31   29 30

Oct                    Nov                    Dec
Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su
1  2  3  4  5                   1  2    1  2  3  4  5  6  7
6  7  8  9 10 11 12    3  4  5  6  7  8  9    8  9 10 11 12 13 14
13 14 15 16 17 18 19   10 11 12 13 14 15 16   15 16 17 18 19 20 21
20 21 22 23 24 25 26   17 18 19 20 21 22 23   22 23 24 25 26 27 28
27 28 29 30 31         24 25 26 27 28 29 30   29 30 31



## Simula

{{trans|C}}
The subtleties of the post-increment logic which is used in the c program took me some time to detect.
For symmetry I also implemented the pre-increment.

simula
BEGIN
INTEGER WIDTH, YEAR;
TEXT ARRAY WDAYS(0:6);
CLASS MONTH(MNAME); TEXT MNAME;
BEGIN INTEGER DAYS, START_WDAY, AT_POS;
END MONTH;
REF(MONTH) ARRAY MONTHS(0:11);
WIDTH := 80; YEAR := 1969;

BEGIN
TEXT T;
INTEGER I, M;
FOR T :- "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa" DO BEGIN
WDAYS(I) :- T; I := I+1;
END;
I := 0;
FOR T :- "January", "February", "March",
"April", "May", "June",
"July", "August", "September",
"October", "November", "December" DO BEGIN
MONTHS(I) :- NEW MONTH(T); I := I+1;
END;
I := 0;
FOR M := 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 DO BEGIN
MONTHS(I).DAYS := M; I := I+1;
END;
END;

BEGIN

PROCEDURE SPACE(N); INTEGER N;
BEGIN
WHILE N > 0 DO BEGIN
OUTCHAR(' '); N := N-1;
END;
END SPACE;

PROCEDURE INIT_MONTHS;
BEGIN
INTEGER I;

IF MOD(YEAR,4) = 0 AND MOD(YEAR,100) <> 0 OR MOD(YEAR,400) = 0 THEN
MONTHS(1).DAYS := 29;

YEAR := YEAR-1;
MONTHS(0).START_WDAY
:= MOD(YEAR * 365 + YEAR//4 - YEAR//100 + YEAR//400 + 1, 7);

FOR I := 1 STEP 1 UNTIL 12-1 DO
MONTHS(I).START_WDAY :=
MOD(MONTHS(I-1).START_WDAY + MONTHS(I-1).DAYS, 7);

COLS := (WIDTH + 2) // 22;
WHILE MOD(12,COLS) <> 0 DO
COLS := COLS-1;
GAP := IF COLS - 1 <> 0 THEN (WIDTH - 20 * COLS) // (COLS - 1) ELSE 0;
IF GAP > 4 THEN
GAP := 4;
LEAD := (WIDTH - (20 + GAP) * COLS + GAP + 1) // 2;
YEAR := YEAR+1;
END INIT_MONTHS;

PROCEDURE PRINT_ROW(ROW); INTEGER ROW;
BEGIN
INTEGER C, I, FROM, UP_TO;
INTEGER PROCEDURE PREINCREMENT(I); NAME I; INTEGER I;
BEGIN I := I+1; PREINCREMENT := I;
END PREINCREMENT;
INTEGER PROCEDURE POSTINCREMENT(I); NAME I; INTEGER I;
BEGIN POSTINCREMENT := I; I := I+1;
END POSTINCREMENT;
FROM := ROW * COLS;
UP_TO := FROM + COLS;
FOR C := FROM STEP 1 UNTIL UP_TO-1 DO BEGIN
I := MONTHS(C).MNAME.LENGTH;
SPACE((20 - I)//2);
OUTTEXT(MONTHS(C).MNAME);
SPACE(20 - I - (20 - I)//2 + (IF C = UP_TO - 1 THEN 0 ELSE GAP));
END;
OUTIMAGE;

FOR C := FROM STEP 1 UNTIL UP_TO-1 DO BEGIN
FOR I := 0 STEP 1 UNTIL 7-1 DO BEGIN
OUTTEXT(WDAYS(I)); OUTTEXT(IF I = 6 THEN "" ELSE " ");
END;
IF C < UP_TO - 1 THEN
SPACE(GAP)
ELSE
OUTIMAGE;
END;

WHILE TRUE DO BEGIN
FOR C := FROM STEP 1 UNTIL UP_TO-1 DO
IF MONTHS(C).AT_POS < MONTHS(C).DAYS THEN
GO TO IBREAK;
IBREAK:
IF C = UP_TO THEN
GO TO OBREAK;

FOR C := FROM STEP 1 UNTIL UP_TO-1 DO BEGIN
FOR I := 0 STEP 1 UNTIL MONTHS(C).START_WDAY-1 DO
SPACE(3);
WHILE POSTINCREMENT(I) < 7 AND MONTHS(C).AT_POS < MONTHS(C).DAYS DO BEGIN
OUTINT(PREINCREMENT(MONTHS(C).AT_POS),2);
IF I < 7 OR C < UP_TO - 1 THEN
SPACE(1);
END;
WHILE POSTINCREMENT(I) <= 7 AND C < UP_TO-1 DO
SPACE(3);
IF C < UP_TO - 1 THEN
SPACE(GAP - 1);
MONTHS(C).START_WDAY := 0;
END;
OUTIMAGE;
END;
OBREAK:
OUTIMAGE;
END PRINT_ROW;

PROCEDURE PRINT_YEAR;
BEGIN
INTEGER ROW;
TEXT BUF;
INTEGER STRLEN;
BUF :- BLANKS(32); BUF.PUTINT(YEAR); BUF.SETPOS(1);
WHILE BUF.MORE AND THEN BUF.GETCHAR = ' ' DO
STRLEN := STRLEN+1;
BUF :- BUF.SUB(STRLEN+1, 32-STRLEN);
SPACE((WIDTH - BUF.LENGTH) // 2);
OUTTEXT(BUF); OUTIMAGE; OUTIMAGE;
WHILE ROW * COLS < 12 DO BEGIN
PRINT_ROW(ROW);
ROW := ROW+1;
END;
END PRINT_YEAR;

INIT_MONTHS;
PRINT_YEAR;
END;
END;


{{out}}

txt

1969

January                 February                 March
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1                       1
5  6  7  8  9 10 11     2  3  4  5  6  7  8     2  3  4  5  6  7  8
12 13 14 15 16 17 18     9 10 11 12 13 14 15     9 10 11 12 13 14 15
19 20 21 22 23 24 25    16 17 18 19 20 21 22    16 17 18 19 20 21 22
26 27 28 29 30 31       23 24 25 26 27 28       23 24 25 26 27 28 29
30 31

April                    May                     June
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                 1  2  3     1  2  3  4  5  6  7
6  7  8  9 10 11 12     4  5  6  7  8  9 10     8  9 10 11 12 13 14
13 14 15 16 17 18 19    11 12 13 14 15 16 17    15 16 17 18 19 20 21
20 21 22 23 24 25 26    18 19 20 21 22 23 24    22 23 24 25 26 27 28
27 28 29 30             25 26 27 28 29 30 31    29 30

July                   August                September
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4  5                    1  2        1  2  3  4  5  6
6  7  8  9 10 11 12     3  4  5  6  7  8  9     7  8  9 10 11 12 13
13 14 15 16 17 18 19    10 11 12 13 14 15 16    14 15 16 17 18 19 20
20 21 22 23 24 25 26    17 18 19 20 21 22 23    21 22 23 24 25 26 27
27 28 29 30 31          24 25 26 27 28 29 30    28 29 30
31

October                 November                December
Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa    Su Mo Tu We Th Fr Sa
1  2  3  4                       1        1  2  3  4  5  6
5  6  7  8  9 10 11     2  3  4  5  6  7  8     7  8  9 10 11 12 13
12 13 14 15 16 17 18     9 10 11 12 13 14 15    14 15 16 17 18 19 20
19 20 21 22 23 24 25    16 17 18 19 20 21 22    21 22 23 24 25 26 27
26 27 28 29 30 31       23 24 25 26 27 28 29    28 29 30 31
30



## Smalltalk

This implementation has been developed using '''Cuis Smalltalk''' [https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev] with '''Aconcagua''' loaded.
To run it, evaluate:
smalltalk>CalendarPrinter printOnTranscriptForYearNumber: 1969>printOnTranscriptForYearNumber: aYearNumber
(self for: (GregorianYear number: aYearNumber) on: Transcript) value

CalendarPrinter class>>for: aYear on: aStream
^self new initializeFor: aYear on: aStream

initializeFor: aYear on: aStream
yearToPrint := aYear.
stream := aStream.
monthsOfYear := yearToPrint months.
monthOfYearCurrentDate := monthsOfYear collect: [ :aMonthOfYear | aMonthOfYear firstDate ].

value
"Prints the year number (header) and then its months"
self
printMonths.

"Prints the year number centered"
self center: yearToPrint number printString in: self numberOfCharactersPerLine.
stream newLine; newLine.

printMonths
"Prints each group of 3 months, for example from January to March, then April to June and so on"
(January to: December by: 3*month) do: [ :aMonth | self printMonthsStartingOn: aMonth ].

printMonthsStartingOn: aMonth
"For each group of 3 months starting in aMonth, prints the name of the month (header),
the name of the days of the week (Mo Tu ...), and then the day numbers"
currentMonths := aMonth to: aMonth next next.
self
printDayNumbers.

"Prints the current group of 3 months names, centered"
currentMonths
do: [ :currentMonth | self center: currentMonth printString in: self numberOfCharactersPerMonth ]
separatedBy: [ stream space: 3 ].
stream newLine.

"Prints the names of the days of week for each month of the current group of 3 months"
currentMonths
do: [ :currentMonth | self printOneMonthDaysOfWeekHeader ]
separatedBy: [ stream space: 3 ].
stream newLine.

"Prints the name of the days of week"
(Sunday to: Saturday)
separatedBy: [ stream space ]

printDayNumbers
"While there are day numbers to print, prints them in a row"
[self hasDayNumbersToPrint] whileTrue: [ self printDayNumbersRow ].

hasDayNumbersToPrint
"If any of the group of 3 months currently printing has day numbers to print returns true, otherwise false"
^currentMonths anySatisfy: [ :currentMonth | self isCurrentDateAtSameMonthOfYearAs: currentMonth ]

isCurrentDateAtSameMonthOfYearAs: currentMonth
"Returns true if the date to print for currentMonth is actually for the currentMonth"
^(self currentDateOf: currentMonth) month = currentMonth

printDayNumbersRow
"For each month of the group of 3, prints a row of day numbers"
currentMonths
do: [ :currentMonth | self printDayNumbersRowOf: currentMonth ]
separatedBy: [ stream space: 3 ].
stream newLine

printDayNumbersRowOf: currentMonth
"Prints the day numbers of the current week"
(Sunday to: Saturday)
separatedBy: [ stream space ]

"If the current date of the current month corresponds to aDayOfWeeks, prints its day number,
if not, leaves a space
This is important to leave the spaces in the first row and last row for those day of week
that do not have a day number related"
| currentDate |
currentDate := self currentDateOf: currentMonth.
(self hasToPrint: currentDate of: currentMonth for: aDayOfWeek)
ifTrue: [
currentDate dayNumber printOn: stream length: 2 zeroPadded: false.
self calculateNextCurrentDateOf: currentMonth ]
ifFalse: [ stream space: 2 ]! !

"Returns whether aDate is part of aCurrentMonth and its day of week is aDayOfWeek.
It is used to decide whether to print the date day number or leave an space"

currentDateOf: currentMonth
"Returns the date to print for currentMonth"
^monthOfYearCurrentDate at: currentMonth number

calculateNextCurrentDateOf: currentMonth
"Changes the date to print of the currentMonth to the next date"
monthOfYearCurrentDate at: currentMonth number put: (self currentDateOf: currentMonth) next

center: stringToCenter in: aNumberOfCharacters
"Prints stringToCenter centered in a line of aNumberOfCharacters total"
| centerStart |
centerStart := aNumberOfCharacters - stringToCenter size // 2.
stream
space: centerStart;
nextPutAll: stringToCenter;
space: aNumberOfCharacters - centerStart - stringToCenter size

numberOfCharactersPerLine
"Returns the number of characters per line"
^66

numberOfCharactersPerMonth
"Returns the number of character per month"
^20



{{out}}

txt

1969
January                February                March
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1                      1
5  6  7  8  9 10 11    2  3  4  5  6  7  8    2  3  4  5  6  7  8
12 13 14 15 16 17 18    9 10 11 12 13 14 15    9 10 11 12 13 14 15
19 20 21 22 23 24 25   16 17 18 19 20 21 22   16 17 18 19 20 21 22
26 27 28 29 30 31      23 24 25 26 27 28      23 24 25 26 27 28 29
30 31
April                   May                    June
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                1  2  3    1  2  3  4  5  6  7
6  7  8  9 10 11 12    4  5  6  7  8  9 10    8  9 10 11 12 13 14
13 14 15 16 17 18 19   11 12 13 14 15 16 17   15 16 17 18 19 20 21
20 21 22 23 24 25 26   18 19 20 21 22 23 24   22 23 24 25 26 27 28
27 28 29 30            25 26 27 28 29 30 31   29 30
July                  August               September
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                   1  2       1  2  3  4  5  6
6  7  8  9 10 11 12    3  4  5  6  7  8  9    7  8  9 10 11 12 13
13 14 15 16 17 18 19   10 11 12 13 14 15 16   14 15 16 17 18 19 20
20 21 22 23 24 25 26   17 18 19 20 21 22 23   21 22 23 24 25 26 27
27 28 29 30 31         24 25 26 27 28 29 30   28 29 30
31
October                November               December
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4                      1       1  2  3  4  5  6
5  6  7  8  9 10 11    2  3  4  5  6  7  8    7  8  9 10 11 12 13
12 13 14 15 16 17 18    9 10 11 12 13 14 15   14 15 16 17 18 19 20
19 20 21 22 23 24 25   16 17 18 19 20 21 22   21 22 23 24 25 26 27
26 27 28 29 30 31      23 24 25 26 27 28 29   28 29 30 31
30



## SPL

spl
year = 1969
#.output(#.str(year,">68<"))
> row, 0..3
> col, 1..3
cal[col] = mcal(row*3+col,year)
size = #.size(cal[col],1)
<
> i, 1..8
str = ""
> col, 1..3
? col>1, str += "    "
line = ""
? #.size(cal[col],1)!20<")
lines[2] = "Mo Tu We Th Fr Sa Su"
n = 3
> i, 1..#.weekday(1,m,y)-1
lines[n] += "   "
<
> d, 1..days[m]
wd = #.weekday(d,m,y)
lines[n] += #.str(d,">2>")
? wd<7, lines[n] += " "
? wd=7, n += 1
<
<= lines
.


{{out}}

txt

1969
January                 February                 March
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5                    1  2                    1  2
6  7  8  9 10 11 12     3  4  5  6  7  8  9     3  4  5  6  7  8  9
13 14 15 16 17 18 19    10 11 12 13 14 15 16    10 11 12 13 14 15 16
20 21 22 23 24 25 26    17 18 19 20 21 22 23    17 18 19 20 21 22 23
27 28 29 30 31          24 25 26 27 28          24 25 26 27 28 29 30
31
April                    May                     June
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5  6              1  2  3  4                       1
7  8  9 10 11 12 13     5  6  7  8  9 10 11     2  3  4  5  6  7  8
14 15 16 17 18 19 20    12 13 14 15 16 17 18     9 10 11 12 13 14 15
21 22 23 24 25 26 27    19 20 21 22 23 24 25    16 17 18 19 20 21 22
28 29 30                26 27 28 29 30 31       23 24 25 26 27 28 29
30
July                   August                September
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5  6                 1  2  3     1  2  3  4  5  6  7
7  8  9 10 11 12 13     4  5  6  7  8  9 10     8  9 10 11 12 13 14
14 15 16 17 18 19 20    11 12 13 14 15 16 17    15 16 17 18 19 20 21
21 22 23 24 25 26 27    18 19 20 21 22 23 24    22 23 24 25 26 27 28
28 29 30 31             25 26 27 28 29 30 31    29 30

October                 November                December
Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su    Mo Tu We Th Fr Sa Su
1  2  3  4  5                    1  2     1  2  3  4  5  6  7
6  7  8  9 10 11 12     3  4  5  6  7  8  9     8  9 10 11 12 13 14
13 14 15 16 17 18 19    10 11 12 13 14 15 16    15 16 17 18 19 20 21
20 21 22 23 24 25 26    17 18 19 20 21 22 23    22 23 24 25 26 27 28
27 28 29 30 31          24 25 26 27 28 29 30    29 30 31



## Tcl

Due to the prevalence of 80 column devices instead of 132 column ones, this code produces 3 months at a time instead of 4.

tcl
package require Tcl 8.5

# Produce information about the days in a month, without any assumptions about
# what those days actually are.
proc calMonthDays {timezone locale year month} {
set days {}
set moment [clock scan [format "%04d-%02d-00 12:00" $year$month] \
-timezone $timezone -locale$locale -format "%Y-%m-%d %H:%M"]
while 1 {
set moment [clock add $moment 1 day] lassign [clock format$moment -timezone $timezone -locale$locale \
-format "%m %d %u"] m d dow
if {[scan $m %d] !=$month} {
return $days } lappend days$moment [scan $d %d]$dow
}
}

proc calMonth {year month timezone locale} {
set dow 0
set line ""
set lines {}
foreach {t day dayofweek} [calMonthDays $timezone$locale $year$month] {
if {![llength $lines]} {lappend lines$t}
if {$dow >$dayofweek} {
lappend lines [string trimright $line] set line "" set dow 0 } while {$dow < $dayofweek-1} { append line " " incr dow } append line [format "%2d "$day]
set dow $dayofweek } lappend lines [string trimright$line]
}

proc cal3Month {year month timezone locale} {
# Extract the month data
set d1 [lassign [calMonth $year$month $timezone$locale] t1]; incr month
set d2 [lassign [calMonth $year$month $timezone$locale] t2]; incr month
set d3 [lassign [calMonth $year$month $timezone$locale] t3]
# Print the header line of month names
foreach t [list $t1$t2 $t3] { set m [clock format$t -timezone $timezone -locale$locale -format "%B"]
set l [expr {10 + [string length $m]/2}] puts -nonewline [format "%-25s" [format "%*s"$l $m]] } puts "" # Print the month days foreach l1$d1 l2 $d2 l3$d3 {
puts [format "%-25s%-25s%s" $l1$l2 $l3] } } proc cal {{year ""} {timezone :localtime} {locale en}} { if {$year eq ""} {
set year [clock format [clock seconds] -format %Y]
}
puts [format "%40s" "-- $year --"] foreach m {1 4 7 10} { puts "" cal3Month$year $m$timezone $locale } } proc snoopy {} { puts [format "%43s\n" {[Snoopy Picture]}] } snoopy cal  Which produces this output: txt [Snoopy Picture] -- 2011 -- January February March 1 2 1 2 3 4 5 6 1 2 3 4 5 6 3 4 5 6 7 8 9 7 8 9 10 11 12 13 7 8 9 10 11 12 13 10 11 12 13 14 15 16 14 15 16 17 18 19 20 14 15 16 17 18 19 20 17 18 19 20 21 22 23 21 22 23 24 25 26 27 21 22 23 24 25 26 27 24 25 26 27 28 29 30 28 28 29 30 31 31 April May June 1 2 3 1 1 2 3 4 5 4 5 6 7 8 9 10 2 3 4 5 6 7 8 6 7 8 9 10 11 12 11 12 13 14 15 16 17 9 10 11 12 13 14 15 13 14 15 16 17 18 19 18 19 20 21 22 23 24 16 17 18 19 20 21 22 20 21 22 23 24 25 26 25 26 27 28 29 30 23 24 25 26 27 28 29 27 28 29 30 30 31 July August September 1 2 3 1 2 3 4 5 6 7 1 2 3 4 4 5 6 7 8 9 10 8 9 10 11 12 13 14 5 6 7 8 9 10 11 11 12 13 14 15 16 17 15 16 17 18 19 20 21 12 13 14 15 16 17 18 18 19 20 21 22 23 24 22 23 24 25 26 27 28 19 20 21 22 23 24 25 25 26 27 28 29 30 31 29 30 31 26 27 28 29 30 October November December 1 2 1 2 3 4 5 6 1 2 3 4 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 31  If a different year is chosen, it's printed… tcl snoopy cal 1969  txt [Snoopy Picture] -- 1969 -- January February March 1 2 3 4 5 1 2 1 2 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 31 April May June 1 2 3 4 5 6 1 2 3 4 1 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 30 July August September 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 October November December 1 2 3 4 5 1 2 1 2 3 4 5 6 7 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31  The code also handles Julian/Gregorian switch dates correctly, but ''must'' be told what locale to format the switch as and for what timezone in that case. For example, Spain was one of the first countries to make the change: tcl snoopy cal 1582 :Europe/Madrid es_ES  txt [Snoopy Picture] -- 1582 -- enero febrero marzo 1 2 3 4 5 6 7 1 2 3 4 1 2 3 4 8 9 10 11 12 13 14 5 6 7 8 9 10 11 5 6 7 8 9 10 11 15 16 17 18 19 20 21 12 13 14 15 16 17 18 12 13 14 15 16 17 18 22 23 24 25 26 27 28 19 20 21 22 23 24 25 19 20 21 22 23 24 25 29 30 31 26 27 28 26 27 28 29 30 31 abril mayo junio 1 1 2 3 4 5 6 1 2 3 2 3 4 5 6 7 8 7 8 9 10 11 12 13 4 5 6 7 8 9 10 9 10 11 12 13 14 15 14 15 16 17 18 19 20 11 12 13 14 15 16 17 16 17 18 19 20 21 22 21 22 23 24 25 26 27 18 19 20 21 22 23 24 23 24 25 26 27 28 29 28 29 30 31 25 26 27 28 29 30 30 julio agosto septiembre 1 1 2 3 4 5 1 2 2 3 4 5 6 7 8 6 7 8 9 10 11 12 3 4 5 6 7 8 9 9 10 11 12 13 14 15 13 14 15 16 17 18 19 10 11 12 13 14 15 16 16 17 18 19 20 21 22 20 21 22 23 24 25 26 17 18 19 20 21 22 23 23 24 25 26 27 28 29 27 28 29 30 31 24 25 26 27 28 29 30 30 31 octubre noviembre diciembre 1 2 3 4 15 16 17 1 2 3 4 5 6 7 1 2 3 4 5 18 19 20 21 22 23 24 8 9 10 11 12 13 14 6 7 8 9 10 11 12 25 26 27 28 29 30 31 15 16 17 18 19 20 21 13 14 15 16 17 18 19 22 23 24 25 26 27 28 20 21 22 23 24 25 26 29 30 27 28 29 30 31  As can be seen, a Real Programmer has many intricacies to deal with! ## uBasic/4tH The required "Snoopy" code is here. Use it when you feel like it. Print " XXXX" Print " X XX" Print " X *** X XXXXX" Print " X ***** X XXX XX" Print " XXXX ******* XXX XXXX XX" Print " XX X ****** XXXXXXXXX XX XXX" Print " XX X **** X X** X" Print " X XX XX X X***X" Print " X //XXXX X XXXX" Print " X // X XX" Print " X // X XXXXXXXXXXXXXXXXXX/" Print " X XXX// X X" Print " X X X X X" Print " X X X X X" Print " X X X X X XX" Print " X X X X X XXX XX" Print " X XXX X X X X X X" Print " X X X XX X XXXX" Print " X X XXXXXXXX\\ XX XX X" Print " XX XX X X X XX" Print " XX XXXX XXXXXX/ X XXXX" Print " XXX XX*** X X" Print " XXXXXXXXXXXXX * * X X" Print " *---* X X X" Print " *-* * XXX X X" Print " *- * XXX X" Print " *- *X XXX" Print " *- *X X XXX" Print " *- *X X XX" Print " *- *XX X X" Print " * *X* X X X" Print " * *X * X X X" Print " * * X** X XXXX X" Print " * * X** XX X X" Print " * ** X** X XX X" Print " * ** X* XXX X X" Print " * ** XX XXXX XXX" Print " * * * XXXX X X" Print " * * * X X X" Print " ### = ******* * * X X XXXXXXXX\\" Print " * * * /XXXXX XXXXXXXX\\ )" Print " =====********** * X ) \\ )" Print " ====* * X \\ \\ )XXXXX" Print " ### === ********** XXXXXXXXXXXXXXXXXXXXXX"  This is the code that generates the calendar: Input "Year to print: "; Y ' input required year Push 63 : Gosub _Space ' center year Print Y For M = 1 To 7 Step 6 ' two rows of six months Print For C = 0 To 5 ' print months Push 1, M + C, Y : Gosub _FnMjd : @(C+6) = Pop() Push 5 : Gosub _Space ' print month name Gosub (M + C) If C = 5 Then ' is it the last month? Print ' if so, terminate line Else ' if not, print eight spaces Push 8 : Gosub _Space EndIf Next For C = 0 To 5 ' print days header Print "Su Mo Tu We Th Fr Sa"; If C = 5 Then ' is it the last month? Print ' if so, terminate line Else ' if not, print two spaces Push 2 : Gosub _Space EndIf ' get days/month Push M + C, Y : Gosub _FnDim : @(C+12) = Pop() @(C) = 1 ' initialize array while we're at it Next C = 0 ' no columns printed yet Q = 0 ' keep track of position Do ' get day of the week Push @(C+6) : Gosub _FnDow : Z = Pop () If @(C) - 1 < @(C + 12) Then ' if a position requested BEFORE If (Z*3 + C*22) < Q Then ' the current position Print ' then terminate the line Q = 0 ' and reset the counter Endif ' goto required position on screen Push (Z*3 + C*22) - Q : Gosub _Space Q = Z*3 + C*22 ' set counter to that position If @(C) < 10 Then ' if only one digit date Print " "; ' then compensate Endif Print @(C); ' print the date Q = Q + 2 ' and update the position @(C) = @(C) + 1 @(C+6) = @(C+6) + 1 Endif ' increment columns, If (Z = 6) + (@(C)>@(C+12)) Then ' wrap around if required C = (C + 1) % 6 EndIf ' loop until all dates are printed Until (@(0)>@(0+12))*(@(1)>@(1+12))*(@(2)>@(2+12))*(@(3)>@(3+12))*(@(4)>@(4+12))*(@(5)>@(5+12)) Loop Print ' terminate row with LF Next End ' convert D/M/Y to Julian date _FnMjd ' (day month year -- julian date) R = Pop() ' pop year S = Pop() - 3 ' pop month T = Pop() ' pop day If S < 0 Then ' if month negative S = S + 12 ' add 12 months R = R - 1 ' and subtract a year Endif Push T + (153*S+2)/5 + R*365 + R/4 - R/100 + R/400 - 678882 Return ' calculate day of the week _FnDow ' (julian -- day-of-week) Push (Pop()+2400002)%7 ' convert julian date to day of week Return ' calculate days in month _FnDim ' (month year -- #days) R = Pop() ' pop year S = Pop() ' pop month If S = 2 Then ' if February, get no. days Push 28 + ((R%4)=0) - ((R%100)=0) + ((R%400)=0) Else ' otherwise, either 30 or 31 If (S = 4) + (S = 6) + (S = 9) + (S = 11) Then Push 30 Else Push 31 Endif Endif Return ' print a number of spaces _Space ' (#spaces --) For X = 1 To Pop() ' print n spaces Print " "; Next Return ' month name subroutines 001 Print " January "; : Return ' all have a fixed length 002 Print " February"; : Return ' which simplifies things 003 Print " March "; : Return 004 Print " April "; : Return 005 Print " May "; : Return 006 Print " June "; : Return 007 Print " July "; : Return 008 Print " August "; : Return 009 Print "September"; : Return 010 Print " October "; : Return 011 Print " November"; : Return 012 Print " December"; : Return  Output (missing Snoopy): txt Year to print: 1969 1969 January February March April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31 29 30 30 31 July August September October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 1 2 3 4 1 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 31 30 0 OK, 0:2753  ## UNIX Shell All Unix variations come with the cal command which makes the task very easy. bash #!/bin/sh echo "Snoopy goes here" cal 1969  Output produced: txt Snoopy goes here 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Vedit macro language This implementation uses the '''calendar.vdm''' macro that comes with Vedit. (So it serves as an example of how to call other macros from a macro.) See [[Calendar - for "real" programmers|CALENDAR]] task for a stand-alone version. Calendar.vdm draws one month calendar. That is then copied as columnar block and pasted to the 1969 calendar. vedit Buf_Switch(Buf_Free) Config_Tab(5,30,55) #9 = 1 // first day of week: 0=Su, 1=Mo #3 = 3 // number of months per line #2 = 1969 // year #1 = 1 // starting month Repeat(12/#3) { Repeat (#3) { Buf_Switch(Buf_Free) Call_File(122, "calendar.vdm", "DRAW_CALENDAR") Reg_Copy_Block(10, 1, EOB_Pos, COLSET, 1, 21) Buf_Quit(OK) EOL Ins_Char(9) #5 = Cur_Pos Reg_Ins(10) Goto_Pos(#5) #1++ } EOF Ins_Newline(2) }  The code above creates calendar for 80x43 display. For 132 column display, change #3 (number of months per line) to 4 or 6, and adjust the tab positions if required. The following would work with all widhts, but the left/right margin would not be balanced. vedit Config_Tab(22)  Output: txt January 1969 February 1969 March 1969 Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su -------------------- -------------------- -------------------- 1 2 3 4 5 1 2 1 2 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 31 April 1969 May 1969 June 1969 Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su -------------------- -------------------- -------------------- 1 2 3 4 5 6 1 2 3 4 1 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 30 July 1969 August 1969 September 1969 Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su -------------------- -------------------- -------------------- 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 October 1969 November 1969 December 1969 Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su -------------------- -------------------- -------------------- 1 2 3 4 5 1 2 1 2 3 4 5 6 7 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31  ## Visual Basic .NET '''Compiler:''' Roslyn Visual Basic (language version >= 15.8) {{works with|.NET Core|2.1}} Inspired by C#. Uses iterators to generate months row-by-row and interleave them to print multiple months beside each other. Attempts to scale to specified row/column count. Minimal validation of numeric arguments is performed, so crashes may occur for certain too-small row and column counts. Does not handle 1752. Options and imports statements (all parts must be in one file): vbnet Option Compare Binary Option Explicit On Option Infer On Option Strict On Imports System.Globalization Imports System.Text Imports System.Runtime.InteropServices Imports System.Runtime.CompilerServices  Helper to parse command-line arguments. vbnet Module ArgHelper ReadOnly _ArgDict As New Dictionary(Of String, String)() Delegate Function TryParse(Of T, TResult)(value As T, ByRef result As TResult) As Boolean Sub InitializeArguments(args As String()) For Each item In args item = item.ToUpperInvariant() If item.Length > 0 AndAlso item(0) <> """"c Then Dim colonPos = item.IndexOf(":"c, StringComparison.Ordinal) If colonPos <> -1 Then ' Split arguments with colons into key(part before colon) / value(part after colon) pairs. _ArgDict.Add(item.Substring(0, colonPos), item.Substring(colonPos + 1, item.Length - colonPos - 1)) End If End If Next End Sub Sub FromArgument(Of T)( key As String, ByRef var As T, getDefault As Func(Of T), tryParse As TryParse(Of String, T), Optional validate As Predicate(Of T) = Nothing) Dim value As String = Nothing If _ArgDict.TryGetValue(key.ToUpperInvariant(), value) Then If Not (tryParse(value, var) AndAlso (validate Is Nothing OrElse validate(var))) Then Console.WriteLine($"Invalid value for {key}: {value}")
Environment.Exit(-1)
End If
Else
var = getDefault()
End If
End Sub
End Module


Program:

vbnet
Module Program
Sub Main(args As String())
Dim dt As Date
Dim columns, rows, monthsPerRow As Integer
Dim vertStretch, horizStretch, resizeWindow As Boolean

InitializeArguments(args)
FromArgument("date", dt, Function() New Date(1969, 1, 1), AddressOf Date.TryParse)
FromArgument("cols", columns, Function() 80, AddressOf Integer.TryParse, Function(v) v >= 20)
FromArgument("rows", rows, Function() 43, AddressOf Integer.TryParse, Function(v) v >= 0)
FromArgument("ms/row", monthsPerRow, Function() 0, AddressOf Integer.TryParse, Function(v) v <= 12 AndAlso v <= columns \ 20)
FromArgument("vstretch", vertStretch, Function() True, AddressOf Boolean.TryParse)
FromArgument("hstretch", horizStretch, Function() True, AddressOf Boolean.TryParse)
FromArgument("wsize", resizeWindow, Function() True, AddressOf Boolean.TryParse)

' The scroll bar in command prompt seems to take up part of the last column.
If resizeWindow Then
Console.WindowWidth = columns + 1
Console.WindowHeight = rows
End If

If monthsPerRow < 1 Then monthsPerRow = Math.Max(columns \ 22, 1)

For Each row In GetCalendarRows(dt:=dt, width:=columns, height:=rows, monthsPerRow:=monthsPerRow, vertStretch:=vertStretch, horizStretch:=horizStretch)
Console.Write(row)
Next
End Sub

Iterator Function GetCalendarRows(
dt As Date,
width As Integer,
height As Integer,
monthsPerRow As Integer,
vertStretch As Boolean,
horizStretch As Boolean) As IEnumerable(Of String)

Dim year = dt.Year
Dim calendarRowCount As Integer = CInt(Math.Ceiling(12 / monthsPerRow))
' Make room for the three empty lines on top.
Dim monthGridHeight As Integer = height - 3

Yield Environment.NewLine

Dim month = 0
Do While month < 12
Dim rowHighestMonth = Math.Min(month + monthsPerRow, 12)

Dim cellWidth = width \ monthsPerRow

' Special case when displaying only one calendar cell in a row to make 20-wide work. Adds padding between cells otherwise.
Dim cellContentWidth = If(monthsPerRow = 1, cellWidth, (cellWidth * 19) \ 20)

Dim cellHeight = monthGridHeight \ calendarRowCount
Dim cellContentHeight = (cellHeight * 19) \ 20

' Creates a month cell for the specified month (1-12).
Dim getMonthFrom =
Function(m As Integer) BuildMonth(
dt:=New Date(dt.Year, m, 1),
width:=cellContentWidth,
height:=cellContentHeight,
vertStretch:=vertStretch,

' The months in this row of the calendar.
Dim monthsThisRow As IEnumerable(Of IEnumerable(Of String)) =
Enumerable.Select(Enumerable.Range(month + 1, rowHighestMonth - month), getMonthFrom)

Dim calendarRow As IEnumerable(Of String) =
Interleaved(
monthsThisRow,
useInnerSeparator:=False,
useOuterSeparator:=True,
outerSeparator:=Environment.NewLine)

Dim en = calendarRow.GetEnumerator()
Dim hasNext = en.MoveNext()
Do While hasNext

Dim current As String = en.Current

' To maintain the (not strictly needed) contract of yielding complete rows, keep the newline after
' the calendar row with the last terminal row of the row.
hasNext = en.MoveNext()
Yield If(hasNext, current, current & Environment.NewLine)
Loop

month += monthsPerRow
Loop
End Function

'''
''' Interleaves the elements of the specified sub-sources by making successive passes through the source
''' enumerable, yielding a single element from each sub-source in sequence in each pass, optionally inserting a
''' separator between elements of adjacent sub-sources and optionally a different separator at the end of each
''' pass through all the sources. (i.e., between elements of the last and first source)
'''
''' The type of the elements of the sub-sources.
''' A sequence of the sequences whose elements are to be interleaved.
''' Whether to insert  between the elements ofadjacent sub-sources.
''' The separator between elements of adjacent sub-sources.
''' Whether to insert  between the elements of the last and first sub-sources.
''' The separator between elements of the last and first sub-source.
''' If , the enumeration continues until every given subsource is empty;
''' if , the enumeration stops as soon as any enumerable no longer has an element to supply for the next pass.
Iterator Function Interleaved(Of T)(
sources As IEnumerable(Of IEnumerable(Of T)),
Optional useInnerSeparator As Boolean = False,
Optional innerSeparator As T = Nothing,
Optional useOuterSeparator As Boolean = False,
Optional outerSeparator As T = Nothing,
Optional whileAny As Boolean = True) As IEnumerable(Of T)
Dim sourceEnumerators As IEnumerator(Of T)() = Nothing

Try
sourceEnumerators = sources.Select(Function(x) x.GetEnumerator()).ToArray()
Dim numSources = sourceEnumerators.Length
Dim enumeratorStates(numSources - 1) As Boolean

Dim anyPrevIters As Boolean = False
Do
' Indices of first and last sub-sources that have elements.
Dim firstActive = -1, lastActive = -1

' Determine whether each sub-source that still have elements.
For i = 0 To numSources - 1
enumeratorStates(i) = sourceEnumerators(i).MoveNext()
If enumeratorStates(i) Then
If firstActive = -1 Then firstActive = i
lastActive = i
End If
Next

' Determine whether to yield anything in this iteration based on whether whileAny is true.
' Not yielding anything this iteration implies that the enumeration has ended.
Dim thisIterHasResults As Boolean = If(whileAny, firstActive <> -1, firstActive = 0 AndAlso lastActive = numSources - 1)
If Not thisIterHasResults Then Exit Do

' Don't insert a separator on the first pass.
If anyPrevIters Then
If useOuterSeparator Then Yield outerSeparator
Else
anyPrevIters = True
End If

' Go through and yield from the sub-sources that still have elements.
For i = 0 To numSources - 1
If enumeratorStates(i) Then
' Don't insert a separator before the first element.
If i > firstActive AndAlso useInnerSeparator Then Yield innerSeparator
Yield sourceEnumerators(i).Current
End If
Next
Loop

Finally
If sourceEnumerators IsNot Nothing Then
For Each en In sourceEnumerators
en.Dispose()
Next
End If
End Try
End Function

'''
''' Returns the rows representing one month cell without trailing newlines. Appropriate leading and trailing
''' whitespace is added so that every row has the length of width.
'''
''' A date within the month to represent.
''' The width of the cell.
''' The height.
''' If , blank rows are inserted to fit the available height.
''' Otherwise, the cell has a constant height of
''' If , the spacing between individual days is increased to
''' fit the available width. Otherwise, the cell has a constant width of 20 characters and is padded to be in
''' the center of the expected width.
Iterator Function BuildMonth(dt As Date, width As Integer, height As Integer, vertStretch As Boolean, horizStretch As Boolean) As IEnumerable(Of String)
Const DAY_WDT = 2 ' Width of a day.
Const ALLDAYS_WDT = DAY_WDT * 7 ' Width of al ldays combined.

' Normalize the date to January 1.
dt = New Date(dt.Year, dt.Month, 1)

' Horizontal whitespace between days of the week. Constant of 6 represents 6 separators per line.
Dim daySep As New String(" "c, Math.Min((width - ALLDAYS_WDT) \ 6, If(horizStretch, Integer.MaxValue, 1)))
' Number of blank lines between rows.
Dim vertblankCount = If(Not vertStretch, 0, (height - 8) \ 7)

' Width of each day * 7 days in one row + day separator length * 6 separators per line.
Dim blockWidth = ALLDAYS_WDT + daySep.Length * 6

' The whitespace at the beginning of each line.
Dim leftPad As New String(" "c, (width - blockWidth) \ 2)
' The whitespace for blank lines.
Dim fullPad As New String(" "c, width)

' Lines are "staged" in the stringbuilder.
Dim numLines = 0

' Get the current line so far form the stringbuilder and begin a new line.
' Returns the current line and trailing blank lines used for vertical padding (if any).
' Returns empty enumerable if the height requirement has been reached.
Dim EndLine =
Function() As IEnumerable(Of String)
Dim finishedLine As String = sb.ToString().PadRight(width)
sb.Clear()

' Use an inner iterator to prevent lazy execution of side effects of outer function.
Return If(numLines >= height,
Enumerable.Empty(Of String)(),
Iterator Function() As IEnumerable(Of String)
Yield finishedLine
numLines += 1

For i = 1 To vertblankCount
If numLines >= height Then Return
numLines += 1
Next
End Function())
End Function

' Yield the month name.
For Each l In EndLine()
Yield l
Next

' Yield the header of weekday names.
Dim weekNmAbbrevs = [Enum].GetNames(GetType(DayOfWeek)).Select(Function(x) x.Substring(0, 2))
sb.Append(String.Join(daySep, weekNmAbbrevs))
For Each l In EndLine()
Yield l
Next

' Day of week of first day of month.
Dim startWkDy = CInt(dt.DayOfWeek)

' Initialize with empty space for the first line.
Dim firstPad As New String(" "c, (DAY_WDT + daySep.Length) * startWkDy)

Dim d = dt
Do While d.Month = dt.Month
sb.AppendFormat(CultureInfo.InvariantCulture, "{{0,{DAY_WDT}}}", d.Day) ' Each row ends on saturday. If d.DayOfWeek = DayOfWeek.Saturday Then For Each l In EndLine() Yield l Next Else sb.Append(daySep) End If d = d.AddDays(1) Loop ' Keep adding empty lines until the height quota is met. Dim nextLines As IEnumerable(Of String) Do nextLines = EndLine() For Each l In nextLines Yield l Next Loop While nextLines.Any() End Function ''' ''' Returns a new string that center-aligns the characters in this string by padding to the left and right with ''' the specified character to a specified total length. ''' ''' The string to center-align. ''' The number of characters in the resulting string. ''' The padding character. Private Function PadCenter(s As String, totalWidth As Integer, Optional paddingChar As Char = " "c) As String Return s.PadLeft(((totalWidth - s.Length) \ 2) + s.Length, paddingChar).PadRight(totalWidth, paddingChar) End Function End Module  ====Command-line arguments:==== Syntax: :, space-separated and optionally enclosed in quotes. * date: Date within year to display. Accepts whatever the .NET DateTime parser is able to parse. Default: 1969-01-01. * cols: Number of columns to display. Default: 80. Min: 20. * rows: Number of rows to display. Default: 43. Min: 0. * ms/row: Number of months per row (or as many as possible for values < 1). Default: 0. Max: 12 or cols*20. * vstretch: Whether individual months are expanded with whitespace to fill vertical space. Default: true. * hstretch: Whether individual months are expanded with whitespace to fill horizontal space. Default: true. * wsize: Whether to resize the command window to the value given by ''cols'' and ''rows''. Set to false if the program is crashing with an error about the console buffer. Default: true. {{out|note=80x43 [default with no args]}} txt [Snoopy] 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  {{out|input=cols:132 rows:60 ms/row:4|note=132-column demonstrating stretching}} txt [Snoopy] 1969 January February March April Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 1 2 3 4 5 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 6 7 8 9 10 11 12 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 13 14 15 16 17 18 19 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 20 21 22 23 24 25 26 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 27 28 29 30 30 31 May June July August Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 1 2 3 4 5 6 7 1 2 3 4 5 1 2 4 5 6 7 8 9 10 8 9 10 11 12 13 14 6 7 8 9 10 11 12 3 4 5 6 7 8 9 11 12 13 14 15 16 17 15 16 17 18 19 20 21 13 14 15 16 17 18 19 10 11 12 13 14 15 16 18 19 20 21 22 23 24 22 23 24 25 26 27 28 20 21 22 23 24 25 26 17 18 19 20 21 22 23 25 26 27 28 29 30 31 29 30 27 28 29 30 31 24 25 26 27 28 29 30 31 September October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 1 2 3 4 1 1 2 3 4 5 6 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  {{out|input=cols:132 rows:30 ms/row:6|note=132-column unstretched}} txt [Snoopy] 1969 January February March April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31 29 30 30 31 July August September October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 1 2 3 4 1 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 31 30  {{out|input=cols:20 rows:120 wsize:false|note=20-column}} txt [Snoopy] 1969 January Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 February Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 March Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 April Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 May Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 June Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 July Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 August Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 September Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 October Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 November Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 December Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31  ## XLISP Targets the 132-column imaginary line printer. The day of the week on 1 January of a given year is found using Gauss's algorithm; LEAP-YEARP is taken from the Rosetta Code task on leap years. lisp (defun calendar (year) (define months-list '(("JANUARY" 31) ("FEBRUARY" 28) ("MARCH" 31) ("APRIL" 30) ("MAY" 31) ("JUNE" 30) ("JULY" 31) ("AUGUST" 31) ("SEPTEMBER" 30) ("OCTOBER" 31) ("NOVEMBER" 30) ("DECEMBER" 31))) (define days #(" Sunday " "Monday " "Tuesday " "Wednesday " "Thursday " "Friday " "Saturday")) (defun gauss-algorithm (a) (rem (+ 1 (+ (* 5 (rem (- a 1) 4)) (* 4 (rem (- a 1) 100)) (* 6 (rem (- a 1) 400)))) 7)) (defun range (start end) (if (<= start end) (cons start (range (+ start 1) end)))) (defun string-repeat (s n) (if (= n 0) "" (string-append s (string-repeat s (- n 1))))) (defun print-month (number-of-days start-day) (defun print-days (day day-of-week end-day) (if (= day-of-week 7) (begin (newline) (define day-of-week 0))) (display (string-repeat " " 8)) (if (= day-of-week 0) (display (string-repeat " " 6))) (if (< day 10) (display " ")) (display day) (display (string-repeat " " 8)) (if (= day end-day) (begin (fresh-line) (+ day-of-week 1)) (print-days (+ day 1) (+ day-of-week 1) end-day))) (mapcar (lambda (n) (display (vector-ref days n))) (range 0 6)) (newline) (display (string-repeat (string-repeat " " 18) start-day)) (print-days 1 start-day number-of-days)) (defun leap-yearp (y) (and (= (mod year 4) 0) (or (/= (mod year 100) 0) (= (mod year 400) 0)))) (define months (make-table)) (mapcar (lambda (month) (table-set! months (car month) (cadr month))) months-list) (if (leap-yearp year) (table-set! months "FEBRUARY" 29)) (defun print-calendar (calendar-months weekday) (newline) (newline) (display (string-repeat " " 60)) (display (caar calendar-months)) (newline) (define next-month-starts (print-month (table-ref months (caar calendar-months)) weekday)) (if (cdr calendar-months) (print-calendar (cdr calendar-months) next-month-starts))) (display (string-repeat " " 60)) (display "******** SNOOPY CALENDAR ") (display year) (display " ********") (newline) (newline) (print-calendar months-list (gauss-algorithm year))) (calendar 1969)  {{out}} txt ******** SNOOPY CALENDAR 1969 ******** JANUARY Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 FEBRUARY Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 MARCH Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 APRIL Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 MAY Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 JUNE Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 JULY Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 AUGUST Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 SEPTEMBER Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 OCTOBER Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 NOVEMBER Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 DECEMBER Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31  ## XPL0 XPL0 include c:\cxpl\codes; \intrinsic 'code' declarations func WeekDay(Year, Month, Day); \Return day of week (0=Sun 1=Mon..6=Sat) int Year, Month, Day; \Works for years from 1583 onward [if Month<=2 then [Month:= Month+12; Year:= Year-1]; return rem((Day-1 + (Month+1)*26/10 + Year + Year/4 + Year/100*6 + Year/400)/7); ]; proc Space(N); \Display N space characters int N; while N do [ChOut(0, ^ ); N:= N-1]; proc Calendar(Year); \Display calendar for specified year int Year; int Month, Col, C, Line, MoName, Days, DayMax, Day(3); [MoName:= [ " January ", " February", " March ", " April ", " May ", " June ", " July ", " August ", "September", " October", " November", " December"]; Space(35); Text(0, "[Snoopy]"); CrLf(0); Space(37); IntOut(0, Year); CrLf(0); CrLf(0); for Month:= 1 to 12 do [for Col:= 0 to 3-1 do [Space(5); Text(0, MoName(Month+Col-1)); Space(7); if Col<2 then Space(8); ]; CrLf(0); for Col:= 0 to 3-1 do [Text(0, "Su Mo Tu We Th Fr Sa"); if Col<2 then Space(9); ]; CrLf(0); for Col:= 0 to 3-1 do \day of first Sunday of month (can be negative) Day(Col):= 1 - WeekDay(Year, Month+Col, 1); for Line:= 0 to 6-1 do [for Col:= 0 to 3-1 do [Days:= [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]; DayMax:= Days(Month+Col); if Month+Col=2 & (rem(Year/4)=0 & rem(Year/100)#0 ! rem(Year/400)=0) then DayMax:= DayMax+1; \if February and leap year then add a day for C:= 0 to 7-1 do [if Day(Col)>=1 & Day(Col)<=DayMax then [IntOut(0, Day(Col)); if Day(Col)<10 then Space(1); \left justify ] else Space(2); \suppress out of range days Space(1); Day(Col):= Day(Col)+1; ]; if Col<2 then Space(8); ]; CrLf(0); ]; CrLf(0); Month:= Month+2; \2+1 months per Col(umn) ]; ]; Calendar(1969)  {{out}} txt [Snoopy] 1969 January February March Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 April May June Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 July August September Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 October November December Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 1 1 2 3 4 5 6 5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13 12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 20 19 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 27 26 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31 30  ## Yabasic {{trans|Lua}} Yabasic clear screen sub snoopy() local n, a

n = open("snoopy.txt", "r")

while(not eof(#n))
line input #n a$print " "; : print color("black", "white") a$
wend

close #n
end sub

sub floor(n)
return int(n + 0.5)
end sub

sub string.rep$(s$, n)
local i, r$for i = 1 to n r$ = r$+ s$
next i

return r$end sub sub center$(s$, width) local fill1 fill1 = floor(width - len(s$)) / 2

return string.rep$(" ",fill1) + s$ + string.rep$(" ",fill1) end sub sub makeMonth(name, skip, days, cal$(), j)
local cal, curday, line$, i curday = 1 - skip cal = 3 cal$(j, 2) = " " + daysTitle$+ " " //cal$(j, 1) = center$(months$(name),len(cal$(j, 2))) cal$(j, 1) = left$(months$(name) + string.rep$(" ", 80), len(cal$(j, 2)))

while(cal < 9)
line$= "" for i = 1 to 7 if curday < 1 or curday > days then line$ = line$+ " " else line$ = line$+ str$(curday, "###")
end if
curday = curday + 1
next
cal = cal + 1
cal$(j, cal) = line$ + " "
wend
end sub

dim months$(12) n = token("JANUARY,FEBRUARY,MARCH,APRIL,MAY,JUNE,JULY,AUGUST,SEPTEMBER,OCTOBER,NOVEMBER,DECEMBER", months$(), ",")
daysTitle$= "MO TU WE TH FR SA SU" dim daysPerMonth(12) for n = 1 to 12 read daysPerMonth(n) next data 31,28,31,30,31,30,31,31,30,31,30,31 sub print_cal(year) local i, q, l, m, startday, sep, monthwidth, calwidth, dpm, calendar$(12, 9), line$(3) startday=mod(((year-1)*365+floor((year-1)/4)-floor((year-1)/100)+floor((year-1)/400)),7) if not mod(year,4) and mod(year,100) or not mod(year,400) then daysPerMonth(2)=29 end if sep = 5 monthwidth = len(daysTitle$)
calwidth = 3 * monthwidth + 2 * sep

for i = 1 to 12
dpm = daysPerMonth(i)
makeMonth(i, startday, dpm, calendar$(), i) startday = mod(startday + dpm, 7) next snoopy() print center$("--- " + str$(year) + " ---", calwidth), "\n" print string.rep$(" ", sep + 1);
for q = 0 to 3
for l = 1 to 9
for m = 1 to 3
print calendar$(q * 3 + m, l); next print print string.rep$(" ", sep);
next
print
print string.rep\$(" ", sep + 1);
next
end sub

print_cal(2018)



## zkl

Gregorian calender only. Hard coded to a fit on a 80x43 terminal (somewhat half assed).

zkl
var [const] D=Time.Date, days="Su Mo Tu We Th Fr Sa";

fcn center(text,m) { String(" "*((m-text.len())/2),text) }

fcn oneMonth(year,month){
day1:=D.zeller(year,month,1);    //1969-1-1 -->3 (Wed, ISO 8601)
dayz:=D.daysInMonth(year,month); //1969-1   -->31
List(center(D.monthNames[month],days.len()),days).extend(
(1).pump(dayz,(0).pump(day1,List,T(Void,""))).apply("%2s ".fmt)
}

const M=70;	// mystery number
fcn oneYear(y=1969,title="3 Days of Peace & Music"){
println(center(title,M),"\n",center(y.toString(),M),"\n");
[1..12,3].pump(String,'wrap(m){  // 3 months per line
mmm:=(m).pump(3,List,oneMonth.fp(y)); //L(L(7-8 lines), L(...), L(...))
if(mmm.apply("len").sum() % 3)  // months have diff # of lines, pad
mmm=mmm.apply("append","");
Utils.zipWith("%-25s%-25s%-25s\n".fmt,
mmm.xplode()).concat() + (if (m
3 Days of Peace & Music
1969

January                  February                  March
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4                        1                        1
5  6  7  8  9 10 11      2  3  4  5  6  7  8      2  3  4  5  6  7  8
12 13 14 15 16 17 18      9 10 11 12 13 14 15      9 10 11 12 13 14 15
19 20 21 22 23 24 25     16 17 18 19 20 21 22     16 17 18 19 20 21 22
26 27 28 29 30 31        23 24 25 26 27 28        23 24 25 26 27 28 29
30 31

April                     May                      June
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4  5                  1  2  3      1  2  3  4  5  6  7
6  7  8  9 10 11 12      4  5  6  7  8  9 10      8  9 10 11 12 13 14
13 14 15 16 17 18 19     11 12 13 14 15 16 17     15 16 17 18 19 20 21
20 21 22 23 24 25 26     18 19 20 21 22 23 24     22 23 24 25 26 27 28
27 28 29 30              25 26 27 28 29 30 31     29 30

July                    August                 September
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4  5                     1  2         1  2  3  4  5  6
6  7  8  9 10 11 12      3  4  5  6  7  8  9      7  8  9 10 11 12 13
13 14 15 16 17 18 19     10 11 12 13 14 15 16     14 15 16 17 18 19 20
20 21 22 23 24 25 26     17 18 19 20 21 22 23     21 22 23 24 25 26 27
27 28 29 30 31           24 25 26 27 28 29 30     28 29 30
31

October                  November                 December
Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
1  2  3  4                        1         1  2  3  4  5  6
5  6  7  8  9 10 11      2  3  4  5  6  7  8      7  8  9 10 11 12 13
12 13 14 15 16 17 18      9 10 11 12 13 14 15     14 15 16 17 18 19 20
19 20 21 22 23 24 25     16 17 18 19 20 21 22     21 22 23 24 25 26 27
26 27 28 29 30 31        23 24 25 26 27 28 29     28 29 30 31
30