# Discordian date

Discordian date
You are encouraged to solve this task according to the task description, using any language you may know.

Convert a given date from the   Gregorian calendar   to the   Discordian calendar.

## 8080 Assembly

This program is written to run under CP/M, and it takes a Gregorian date as an argument on the command line, in `DDMMYYYY` format.

```		;; On the 44th day of Discord in the YOLD 3186, ddate
;; has finally come to CP/M.
bdos:		equ	5	; CP/M syscalls
puts:		equ	9
putch:		equ	2
fcb:		equ	5ch
month:		equ	fcb + 1		; use the FCB as the date argument
day:		equ	month + 2
year:		equ	day + 2
org	100h
;; CP/M will try to parse the command line arguments as if
;; they are filenames. As luck would have it, MMDDYYYY is
;; 8 characters. It would be a shame not to use this.
lxi	h,month		; check that the 'filename' is
lxi	b,0800h		; all digits (and zero out C)
argcheck:	mov	a,m
call	isdigit
jnc	argerror	; if not, give an error and exit
inx	h
dcr	b
jnz	argcheck
;; Fix the year (add 1166 to it, digit by digit)
lxi	d,year + 3
lxi	h,yearoffset + 3
mvi	b,4
ana	a		; Clear carry
yeardgt:	ldax	d		; Get digit
cpi	'9' + 1		; Did we overshoot?
cmc			; Carry is opposite of what we need
jnc	yearnextdgt	; No carry = no adjustment
sui	10		; Compensate
stc			; Carry the one
yearnextdgt:	stax	d		; Save digit
dcx	d		; Look at more significant digit
dcx	h
dcr	b		; Until we're out of digits
jnz	yeardgt
lxi	h,year + 4	; Terminate the year with a \$
mvi	m,'\$'		; for easy output.
;; Is it St. Tib's Day?
lxi	d,month		; Check month and day
lxi	h,leap		; Against '0229'
mvi	b,4
tibcheck:	ldax	d		; Get date byte
cmp	m		; Match against leap day
jnz	notibs		; No match = not Tibs
inx	h
inx	d
dcr 	b
jnz	tibcheck	; if they all match it _is_ Tibs
;; Print "St. Tib's Day in the YOLD NNNN."
lxi	d,tibsday
call	outs		; fall through into printyear
;; Print " in the YOLD NNNN."
printyear:	lxi	d,yold
call	outs
lxi	d,year
jmp	outs		; if Tibs, this ends the program
;; It isn't St. Tib's Day. We'll need to do real work :(
notibs:		lxi	h,month		; Find days at beginning of month
call	parsenum	; (not counting Tibs)
dcr	a		; subtract one (table is 0-indexed)
cpi	12		; check that month < 12
jnc	argerror	; otherwise, argument error
ana	a		; multiply month by 2
ral			; (entries are 2 bytes wide)
lxi	h,monthdays	; get days table
mov	d,c		; look up the entry (C is zero here)
mov	e,a
mov	e,m		; load the 16-bit entry into DE
inx	h
mov	d,m
lxi	h,day		; Find day number
call	parsenum
mov	l,a		; Add it to the start of the month
mov	h,c		; (C is still zero) - to get the day
dad	d		; number (still not counting Tibs)
dcx	h		; One less (so we have day numbering at 0)
push	h		; Keep day number
lxi	d,-365		; Make sure it isn't >365
jc	argerror	; Give an error otherwise
pop	h		; Restore day number
push	h 		; Keep it around
;; Calculate Erisian weekday
lxi	d,-5		; It's not worth it being clever here
jc	weekcalc
lxi	d,5
mov	b,l
lxi	h,weekdays	; Print the day of the week
call	strselect
lxi	d,commaday	; Print ", day "
call	outs
;; Calculate season and season day number
pop	h		; Restore day number
mvi	b,-1		; B will be season
lxi	d,-73		; L will be day
seasoncalc:	inr	b		; One season further on
dad	d		; Is 73 days less
jc 	seasoncalc
lxi	d,73		; Correct overshoot
mov	h,b		; H:L = season:day
inr	l		; One based for output
push	h		; Push season and day
mov	a,l		; Print day of season
mvi	c,'0'-1		; Tens digit in C
seasondgts:	inr	c
sui	10
jnc	seasondgts
adi	'0' + 10 	; Ones digit in A
mov	e,c		; Tens digit
call	oute
mov	e,a		; Ones digit
call	oute
lxi	d,of		; Print " of "
call	outs
pop	b		; Retrieve season:day
push	b
lxi	h,seasons	; Print the season name
call	strselect
call	printyear	; "... in the YOLD NNNN ..."
;; Is there any reason to celebrate? (day=5 or day=50)
pop 	b		; Retrieve season:day
mov	a,c		; Day.
cpi	5		; is it 5?
jz	party		; Then we party
cpi	50 		; otherwise, is it 50?
rnz			; If not, we're done
party:		push	b		; Keep day
lxi	d,celebrate	; "... Celebrate ..."
call	outs
pop	b		; Retrieve day
push	b
lxi	h,holydays5	; Get holyday from 5 or 50 table
mov	a,c
cpi	50
jnz	dayname
lxi	h,holydays50
dayname:	call	strselect	; the season is still in B
lxi	d,xday
pop	b		; Retrieve day once more
mov	a,c
cpi	50
jnz	outs		; Print 'day' or 'flux' depending
lxi	d,xflux
jmp	outs
;; Parse the 2-digit number in HL. Return in B (and A)
parsenum:	mvi	b,0		; zero accumulator
call	parsedigit	; this runs it twice
parsedigit:	mov	a,b		; B *= 10
mov	b,a
sui	'0'		; Subtract '0'
mov	b,a
inx	h
ret
;; Print the B'th string from HL
strselect:	mvi	a,'\$'
strsearcho:	dcr	b
jm	strfound
strsearchi:	cmp	m
inx	h
jnz	strsearchi
jmp	strsearcho
strfound:	xchg
jmp	outs
;; Print the argument error, and exit
argerror:	lxi	d,argfmt
;; Print the string in DE and exit
error:		call	outs
rst	0
;; Returns with carry flag set if A is a digit ('0'-'9').
isdigit:	cpi	'0'
cmc
rnc
cpi	'9' + 1
ret
;; Print the string in D.
outs:		mvi	c,puts
jmp	bdos
;; Print character in E, keeping registers.
oute:		push	psw
push	b
push 	d
push	h
mvi	c,putch
call	bdos
pop	h
pop	d
pop	b
pop	psw
ret
;; Accumulated days at start of Gregorian months
;; (in a non-leap year)
monthdays:	dw	0,31,59,90,120,151,181,212,243,273,304,334
;; Difference between Gregorian and Erisian year count
;; (we don't need to bother with the year otherwise)
yearoffset:	db	1,1,6,6
;; This is matched to MMDD to handle St. Tib's Day
leap:		db	'0229'
;; Strings
argfmt:		db	'DDATE MMDDYYYY\$'
weekdays:	db	'Sweetmorn\$Boomtime\$Pungenday\$Prickle-Prickle\$'
db	'Setting Orange\$'
of:		db	' of \$'
seasons:	db	'Chaos\$Discord\$Confusion\$Bureaucracy\$The Aftermath\$'
celebrate:	db	': celebrate \$'
holydays5:	db	'Mung\$Mojo\$Sya\$Zara\$Mala\$'
xday:		db	'day!\$'
holydays50:	db	'Chao\$Disco\$Confu\$Bure\$Af\$'
xflux:		db	'flux!\$'
tibsday:	db	'Saint Tib',39,'s Day\$'
yold:		db	' in the YOLD \$'```
Output:
```A>ddate 04272020
Boomtime, day 44 of Discord in the YOLD 3186
A>ddate 09261995
Prickle-Prickle, day 50 of Bureaucracy in the YOLD 3161: celebrate Bureflux!
A>ddate 02291996
Saint Tib's Day in the YOLD 3162
A>ddate 07222011
Pungenday, day 57 of Confusion in the YOLD 3177
A>ddate 01052005
Setting Orange, day 05 of Chaos in the YOLD 3171: celebrate Mungday!
```

## 8086 Assembly

Translation of: 8080 Assembly

This program runs under DOS. It can take a date on the command line in the form `MM/DD/YYYY`, and if a date is not given, it asks DOS for the system date and uses that instead. It is mostly a port of the 8080 (CP/M) version, but it does use the 8086's new capabilities where possible, e.g. multiplication and division, and the string lookups are done using an 8086 string instruction.

This code is written to compile to a `.COM` file using `nasm`.

```		;; DDATE for MS-DOS (assembles using nasm)
bits	16
cpu	8086
tlength:	equ	80h
cmdtail:	equ	81h
putch:		equ	2
puts:		equ	9
getdate:	equ	2Ah
org	100h
section		.text
;; Check if a date was given
mov	bl,[tlength]	; Length of command line
and	bl,bl		; Is it zero?
jz	gettoday	; Then get today's date
;; Parse the date given on the command line
cmp	bl,10+1		; MM/DD/YYYY is ten characters long
jne	printusage	; If it doesn't match, print usage.
xor	bh,bh
mov	byte [bx],0	; Zero terminate the date
mov	si,cmdtail+1	; Get month,
call	atoi
mov	dh,al		; store in DH,
inc	si		; get day,
call	atoi
mov 	dl,al		; store in DL,
inc	si		; get year,
call	atoi
mov	cx,ax		; and store in CX.
jmp	convertdate
;; Ask MS-DOS for the date
gettoday:	mov	ah,puts		; Prefix output with 'Today is '
mov	dx,todayis
int	21h
mov	ah,getdate	; And get the current date.
int	21h
;; Convert the date to the Discordian calendar
;; (DL=day, DH=month, CX=year)
convertdate:	add	cx,1166		; Erisian year is 1166 years onwards.
cmp 	dx,21dh		; Is it St. Tib's Day?
jne	notibs
mov	dx,tibsday 	; If yes, print "St. Tib's Day"
mov	ah,puts
int	21h
;; Print "in the YOLD NNNN" and then end.
intheyold:	mov	dx,yold		; In the YOLD
mov	ah,puts
int	21h
mov	ax,cx		; print the year
call	printn
ret			; If Tibs, this ends the program.
;; It isn't St. Tib's Day.
notibs:		cmp	dh,1		; Month < 1 = error
jb	printinval
cmp	dl,1		; Day < 1 = error
jb	printinval
cmp	dh,12		; Month > 12 = error
ja	printinval
mov	bx,monthlengths-1
xor	ah,ah		; Day higher than it should be
mov	al,dh		; (according to month table)
cmp	dl,[bx]
ja	printinval
mov	bx,monthdays-2	; Calculate day of year
mov	al,dh		; Cumulative months
sal	al,1		; Multiply by 2 (2 bits per entry)
mov	ax,[bx]		; Days since start of month
xor	dh,dh
dec	dx		; Start at 0 (For array lookup)
mov	ax,dx		; Get weekday
mov	bl,5		; Divide by 5
div	bl		; AH = weekday (modulo)
mov	bl,ah
mov	di,weekdays
call	strselect	; Print the weekday
mov	bx,dx		; Keep day of year in bx for now
mov	dx,commaday	; ... ', day '
call	printstr
mov	dl,73		; Each season is 73 days long
mov	ax,bx		; Divide day of year by 73
div	dl		; DH=AH=day of season (modulo)
mov	dx,ax		; DL=AL=season number
xor	ah,ah		; Print day of season
mov	al,dh
inc	al		; One more (days do start at 1)
call	printn
mov	bx,dx		; Store day and season in bx
mov	dx,of		; Print ... ' of '
call	printstr
mov	dx,bx		; Day and season in dx again
mov	di,seasons	; Print season
call	strselect	; BL is still season number
mov	bx,dx		; Day and season in BX again.
call	intheyold	; Print the year
cmp	bh,5-1		; Something to celebrate?
je	party		; (Day 5 or 50?
cmp	bh,50-1
je	party
ret			; If not, stop.
party:		mov	al,bh		; Day in AL.
mov	bx,holydays5	; Day 5 holydays.
mov	cx,xday
cmp	al,50-1		; Unless it's 50
jne	holyday
mov	bx,holydays50	; Then we need day 50 holydays.
mov	cx,xflux
holyday:	mov	dx,celebrate	; Print ... ', celebrate: '
call	printstr
mov	dx,bx
call	printstr
mov	dx,cx
jmp	printstr
;; Print "invalid date".
printinval:	mov	dx,inval
jmp	printstr
;; Print usage.
printusage:	mov	dx,usage
;; Print DX.
printstr:	mov	ah,puts
int	21h
ret
;; Subroutine: print the BL'th string from DI
strselect:	inc	bl		; Counter the 'dec bl' later
mov	al,'\$'		; String end
push	cx		; Keep registers
push	dx
.search		dec	bl		; Are we there yet?
jz	.found
mov	cx,-1
repne	scasb 		; Scan to end of string
jmp	.search
.found		mov	dx,di		; Found the string, print it
mov	ah,puts
int	21h
pop	dx		; Restore registers
pop	cx
ret
;; Subroutine: print number in AX.
printn:		push	cx		; Don't trample registers
push	dx
mov	si,numend 	; End of number string.
mov	cx,10 		; Divisor, ten.
.loop		xor	dx,dx		; Zero DX.
dec	si		; Back up one digit.
div	cx		; Divide AX by ten.
add	dl,'0'		; Remainder is now in DX; make ASCII
mov	[si],dl		; and store.
and	ax,ax		; Quotient is in AX, check if zero
jnz	.loop 		; loop for next digit if there is one.
mov	dx,si		; Print SI - move it to DX,
mov	ah,puts		; and then call the DOS print function
int	21h
pop	dx		; Restore the registers
pop	cx
ret
;; Subroutine: parse number at [SI], store in AX.
atoi:		push	bx		; Don't trample registers
push	cx
push	dx
xor	ax,ax		; Zero AX.
xor	bh,bh		; BH as well.
mov	cx,10		; Multiplier, ten.
.loop		mov	bl,[si]		; Current number.
sub	bl,'0'		; Subtract '0'.
jc	.done		; If <0, then done.
cmp	bl,9		; If it's higher than 9,
jnbe	.done		; also done.
mul	cx		; Multiply accumulator by 10
inc	si		; Next digit
jmp	.loop
.done		pop	dx		; Restore registers
pop	cx
pop	bx
ret
section		.data
;; Accumulated days at start of Gregorian months
monthdays:	dw	0,31,59,90,120,151,181,212,243,273,304,334
;; Days per month
monthlengths:	db	31,28,31,30,31,30,31,31,30,31,30,31
;; Strings
inval:		db	'Invalid date.\$'
usage:		db	`DDATE [MM/DD/YYYY]\r\n`
db	`\r\n\tPrint today's date or the given date in the`
db	` Discordian calendar.\$`
number:		db	'00000'
numend:		db	'\$'
todayis:	db	'Today is \$'
weekdays:	db	'Sweetmorn\$Boomtime\$Pungenday\$Prickle-Prickle\$'
db	'Setting Orange\$'
of:		db	' of \$'
seasons:	db	'Chaos\$Discord\$Confusion\$Bureaucracy\$The Aftermath\$'
celebrate:	db	': celebrate \$'
holydays5:	db	'Mung\$Mojo\$Sya\$Zara\$Mala\$'
xday:		db	'day!\$'
holydays50:	db	'Chao\$Disco\$Confu\$Bure\$Af\$'
xflux:		db	'flux!\$'
tibsday:	db	"Saint Tib's Day\$"
yold:		db	' in the YOLD \$'
```
Output:
```C:\>ddate
Today is Pungenday, day 50 of Discord in the YOLD 3186: celebrate Chaoflux!
C:\>ddate 09/26/1995
Prickle-Pricke, day 50 of Bureaucracy in the YOLD 3161: celebrate Chaoflux!
C:\>ddate 02/29/1996
Saint Tib's Day in the YOLD 3162
C:\>ddate 07/22/2011
Pungenday, day 57 of Confusion in the YOLD 3177
C:\>ddate 01/05/2005
Setting Orange, day 5 of Chaos in the YOLD 3171: celebrate Mungday!
```

## Action!

...via PL/M

```;;; Discordian date calculation - translation of MAD (via PL/M)

;;; returns the next number from line, the terminator is ignored
;;;         pos holds the position in line and is updated to the
;;;             position of the character following the trailing
;;;             delimiter - if there is one
;;;             pos should be set to 1 on rhe first call
INT FUNC getNumber( CHAR ARRAY line, CARD POINTER pos )
CARD value, linePos

linePos = pos^
value   = 0
; skip spaces
WHILE linePos <= line(0) AND line(linePos) = '  DO linePos ==+ 1 OD
; get the number
WHILE linePos <= line(0) AND line(linePos) >= '0 AND line(linePos) <= '9
DO
value   ==* 10
value   ==+ (line(linePos) - '0)
linePos ==+ 1
OD
pos^ = linePos + 1
RETURN(value)

;;; get a Gregorian date and output it as a Discordian date
PROC Main()

DEFINE STRING_POINTER = "CARD"

CARD gMonth, gDay, gYear, gPos
CARD yrDay, season, day, wkDay
CHAR ARRAY gLine(256)
STRING_POINTER ARRAY holy5(5), holy50(5), disday(5), disssn(5)
INT ARRAY mlengt(13) = [   0   0  31  59  90 120
151 181 212 243 273 304 334
]
holy5 (0) = "MUNG"           holy5 (1) = "MOJO"  holy5 (2) = "SYA"
holy5 (3) = "ZARA"           holy5 (4) = "MALA"
holy50(0) = "CHAO"           holy50(1) = "DISCO" holy50(2) = "CONFU"
holy50(3) = "BURE"           holy50(4) = "AF"
disday(0) = "SWEETMORN"      disday(1) = "BOOMTIME"
disday(2) = "PUNGENDAY"      disday(3) = "PRICKLE-PRICKLE"
disday(4) = "SETTING ORANGE"
disssn(0) = "CHAOS"          disssn(1) = "DISCORD" disssn(2) = "CONFUSION"
disssn(3) = "BUREAUCRACY"    disssn(4) = "THE AFTERMATH"

; get the Gregorian date from the keyboard, NB: no validation
Print("Gregorian date (MM/DD/YYYY)> ")
InputS(gLine)
gPos   = 1
gMonth = getNumber(gLine, @gPos)
gDay   = getNumber(gLine, @gPos)
gYear  = getNumber(gLine, @gPos)

; convert to Discordian
IF gMonth = 2 AND gDay = 29 THEN
Print("SAINT TIB'S DAY IN THE Y.O.L.D. ")PrintC(gYear+1166)
ELSE
yrDay  = mlengt(gMonth)+gDay
season = yrDay/73
day    = yrDay-season*73
wkDay  = (yrDay-1) MOD 5
Print(disday(wkDay) )Print(", DAY ")PrintC(day)Print(" OF ")
Print(disssn(season))Print(" IN THE Y.O.L.D ")PrintC(gYear+1166)
IF     day =  5 THEN
PutE()
Print("CELEBRATE ")Print(holy5(season))Print("DAY")
ELSEIF day = 50 THEN
PutE()
Print("CELEBRATE ")Print(holy50(season))Print("FLUX")
FI
FI
PutE()

RETURN```
Output:
```Gregorian date (MM/DD/YYYY)> 4/1/2023
SWEETMORN, DAY 18 OF DISCORD IN THE Y.O.L.D 3189
```

```with Ada.Calendar.Arithmetic;

procedure Discordian is

subtype Year_Number is Integer range 3067 .. 3565;
type Seasons is (Chaos, Discord, Confusion, Bureaucracy, The_Aftermath);
type Days_Of_Week is (Sweetmorn, Boomtime, Pungenday,
Prickle_Prickle, Setting_Orange);
subtype Day_Number is Integer range 1 .. 73;

type Discordian_Date is record
Year        : Year_Number;
Season      : Seasons;
Day         : Day_Number;
Week_Day    : Days_Of_Week;
Is_Tibs_Day : Boolean := False;
end record;

function Week_Day_To_Str(Day : Days_Of_Week) return Unbounded_String is
s : Unbounded_String;
begin
case Day is
when Sweetmorn       => s := To_Unbounded_String("Sweetmorn");
when Boomtime        => s := To_Unbounded_String("Boomtime");
when Pungenday       => s := To_Unbounded_String("Pungenday");
when Prickle_Prickle => s := To_Unbounded_String("Prickle-Prickle");
when Setting_Orange  => s := To_Unbounded_String("Setting Orange");
end case;
return s;
end Week_Day_To_Str;

function Holiday(Season: Seasons) return Unbounded_String is
s : Unbounded_String;
begin
case Season is
when Chaos         => s := To_Unbounded_String("Chaoflux");
when Discord       => s := To_Unbounded_String("Discoflux");
when Confusion     => s := To_Unbounded_String("Confuflux");
when Bureaucracy   => s := To_Unbounded_String("Bureflux");
when The_Aftermath => s := To_Unbounded_String("Afflux");
end case;
return s;
end Holiday;

function Apostle(Season: Seasons) return Unbounded_String is
s : Unbounded_String;
begin
case Season is
when Chaos         => s := To_Unbounded_String("Mungday");
when Discord       => s := To_Unbounded_String("Mojoday");
when Confusion     => s := To_Unbounded_String("Syaday");
when Bureaucracy   => s := To_Unbounded_String("Zaraday");
when The_Aftermath => s := To_Unbounded_String("Maladay");
end case;
return s;
end Apostle;

function Season_To_Str(Season: Seasons) return Unbounded_String is
s : Unbounded_String;
begin
case Season is
when Chaos         => s := To_Unbounded_String("Chaos");
when Discord       => s := To_Unbounded_String("Discord");
when Confusion     => s := To_Unbounded_String("Confusion");
when Bureaucracy   => s := To_Unbounded_String("Bureaucracy");
when The_Aftermath => s := To_Unbounded_String("The Aftermath");
end case;
return s;
end Season_To_Str;

procedure Convert (From : Time; To : out Discordian_Date) is
First_Day   : Time;
Number_Days : Day_Count;
Leap_Year   : boolean;
begin
First_Day   := Time_Of (Year => Year (From), Month => 1, Day => 1);
Number_Days := From - First_Day;

To.Year        := Year (Date => From) + 1166;
To.Is_Tibs_Day := False;
Leap_Year := False;
if Year (Date => From) mod 4 = 0 then
if Year (Date => From) mod 100 = 0 then
if Year (Date => From) mod 400 = 0 then
Leap_Year := True;
end if;
else
Leap_Year := True;
end if;
end if;
if Leap_Year then
if Number_Days > 59 then
Number_Days := Number_Days - 1;
elsif Number_Days = 59 then
To.Is_Tibs_Day := True;
end if;
end if;
To.Day := Day_Number (Number_Days mod 73 + 1);
case Number_Days / 73 is
when 0 => To.Season := Chaos;
when 1 => To.Season := Discord;
when 2 => To.Season := Confusion;
when 3 => To.Season := Bureaucracy;
when 4 => To.Season := The_Aftermath;
when others => raise Constraint_Error;
end case;
case Number_Days mod 5 is
when 0 => To.Week_Day := Sweetmorn;
when 1 => To.Week_Day := Boomtime;
when 2 => To.Week_Day := Pungenday;
when 3 => To.Week_Day := Prickle_Prickle;
when 4 => To.Week_Day := Setting_Orange;
when others => raise Constraint_Error;
end case;
end Convert;

procedure Put (Item : Discordian_Date) is
begin
if Item.Is_Tibs_Day then
else
UStr_IO.Put (Week_Day_To_Str(Item.Week_Day));
Ada.Text_IO.Put (", day" & Integer'Image (Item.Day));
UStr_IO.Put (Season_To_Str (Item.Season));
if Item.Day = 5 then
UStr_IO.Put (Apostle(Item.Season));
elsif Item.Day = 50 then
UStr_IO.Put (Holiday(Item.Season));
end if;
end if;
Ada.Text_IO.Put (" in the YOLD" & Integer'Image (Item.Year));
end Put;

Test_Day  : Time;
Test_DDay : Discordian_Date;
Year : Integer;
Month : Integer;
Day : Integer;
YYYYMMDD : Integer;
begin

if Argument_Count = 0 then
Test_Day := Clock;
Convert (From => Test_Day, To => Test_DDay);
Put (Test_DDay);
end if;

for Arg in 1..Argument_Count loop

if Argument(Arg)'Length < 8 then
Ada.Text_IO.Put("ERROR: Invalid Argument : '" & Argument(Arg) & "'");
raise Constraint_Error;
end if;

begin
YYYYMMDD := Integer'Value(Argument(Arg));
exception
when Constraint_Error =>
Ada.Text_IO.Put("ERROR: Invalid Argument : '" & Argument(Arg) & "'");
raise;
end;

Day := YYYYMMDD mod 100;
if Day < Day_Number'First or Day > Day_Number'Last then
raise Constraint_Error;
end if;

Month := ((YYYYMMDD - Day) / 100) mod 100;
if Month < Month_Number'First or Month > Month_Number'Last then
raise Constraint_Error;
end if;

Year := ((YYYYMMDD - Day - Month * 100) / 10000);
if Year < 1901 or Year > 2399 then
raise Constraint_Error;
end if;

Test_Day := Time_Of (Year => Year, Month => Month, Day => Day);

Convert (From => Test_Day, To => Test_DDay);
Put (Test_DDay);

end loop;

end Discordian;
```
Output:
```\$ ./discordian 21001231 20120228 20120229 20120301 20100722 20120902 20121231
Setting Orange, day 73 of The Aftermath in the YOLD 3266
Prickle-Prickle, day 59 of Chaos in the YOLD 3178
St. Tib's Day in the YOLD 3178
Setting Orange, day 60 of Chaos in the YOLD 3178
Pungenday, day 57 of Confusion in the YOLD 3176
Setting Orange, day 26 of Bureaucracy in the YOLD 3178
Setting Orange, day 73 of The Aftermath in the YOLD 3178```

## ALGOL 68

Translation of: ALGOL W

which was itself,

Algol 68 has variable length strings which simplifies this a lot relative to the Algol W version.

```BEGIN #   DISCORDIAN DATE CALCULATION - TRANSLATION OF MAD VIA ALGOL W    #
INT      greg, gmonth, gday, gyear;
[]STRING holys  = []STRING( "MUNG", "MOJO",  "SYA",   "ZARA", "MALA" )[ AT 0 ];
[]STRING holys0 = []STRING( "CHAO", "DISCO", "CONFU", "BURE", "AF"   )[ AT 0 ];
[]STRING disday = []STRING( "SWEETMORN", "BOOMTIME", "PUNGENday", "PRICKLE-PRICKLE", "SETTING ORANGE" )[ AT 0 ];
[]STRING disssn = []STRING( "CHAOS",     "DISCORD",  "CONFUSION", "BUREAUCRACY",     "THE AFTERMATH"  )[ AT 0 ];
[]INT    mlengt = []INT( 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 )[ AT 0 ];
CHAR     slash1, slash2;

# input date should contain MM/DD/YYYY in the gregorian calendar      #
read( ( gmonth, slash1, gday, slash2, gyear ) );
IF slash1 /= "/" OR slash2 /= "/" THEN print( ( "Invalid date format", newline ) ); stop FI;

IF gmonth = 2 AND gday = 29
THEN print( ( "SAINT TIB'S DAY IN THE Y.O.L.D. ", whole( gyear + 1166, -4 ), newline ) )
ELSE
INT yrday  := mlengt[ gmonth ] + gday;
INT season := yrday OVER 73;
INT day    := yrday - ( season * 73 );
INT wkday  := ( yrday - 1 ) MOD 5;
print( ( disday[ wkday ], ", DAY ", whole( day, -2 ), " OF ", disssn[ season ]
, " IN THE Y.O.L.D ", whole( gyear + 1166, 0 ), newline
)
);
IF   day = 5  THEN print( ( "CELEBRATE ", holys[  season ], "DAY"  ) )
ELIF day = 50 THEN print( ( "CELEBRATE ", holys0[ season ], "FLUX" ) )
FI
FI
END```
Output:
```11/04/1167
PUNGENday, day 16 OF THE AFTERMATH IN THE Y.O.L.D 2333

08/15/2017
BOOMTIME, DAY  8 OF BUREAUCRACY IN THE Y.O.L.D 3183

12/06/2020
SETTING ORANGE, DAY 48 OF THE AFTERMATH IN THE Y.O.L.D 3186

07/12/1969
PUNGENday, DAY 47 OF CONFUSION IN THE Y.O.L.D 3135

07/05/2005
SWEETMORN, DAY 40 OF CONFUSION IN THE Y.O.L.D 3171

09/26/1995
PRICKLE-PRICKLE, DAY 50 OF BUREAUCRACY IN THE Y.O.L.D 3161
CELEBRATE BUREFLUX

11/30/2021
PRICKLE-PRICKLE, DAY 42 OF THE AFTERMATH IN THE Y.O.L.D 3187
```

## ALGOL W

Algol W doesn't have the array initialisation equivalent of MAD's VECTOR VALUES and also does not allow implicit declarations. Algol W does not have I/O formsts or variable length strings in output, which makes this version somewhat longer.

```BEGIN %   DISCORDIAN DATE CALCULATION - TRANSLATION OF MAD                %
INTEGER          GREG, GMONTH, GDAY, GYEAR;
STRING(16) ARRAY HOLY5  ( 0 ::  4 );
STRING(16) ARRAY HOLY50 ( 0 ::  4 );
STRING(16) ARRAY DISDAY ( 0 ::  4 );
STRING(16) ARRAY DISSSN ( 0 ::  4 );
INTEGER    ARRAY MLENGT ( 0 :: 12 );
INTEGER          APOS;
STRING(1)        SLASH1, SLASH2;

% WRITES A "\$" TERMINATED STRING                                      %
PROCEDURE WRITEONTEXT( STRING(16) VALUE TEXT ) ;
BEGIN
INTEGER TPOS;
TPOS := 0;
WHILE TPOS < 16 DO BEGIN
IF TEXT( TPOS // 1 ) = "\$"
THEN TPOS := 32
ELSE WRITEON( TEXT( TPOS // 1 ) );
;
TPOS := TPOS + 1
END WHILE_TPOS_LT_16
END WRITEONTEXT;

APOS := 0;
FOR M := 0,0,31,59,90,120,151,181,212,243,273,304,334 DO BEGIN MLENGT(APOS) := M; APOS := APOS + 1 END;
HOLY5 (0) := "MUNG\$";HOLY5 (1) := "MOJO\$"; HOLY5 (2) := "SYA\$";  HOLY5 (3) := "ZARA\$"; HOLY5 (4) := "MALA\$";
HOLY50(0) := "CHAO\$";HOLY50(1) := "DISCO\$";HOLY50(2) := "CONFU\$";HOLY50(3) := "BURE\$"; HOLY50(4) := "AF\$";
DISDAY(0) := "SWEETMORN\$";       DISDAY(1) := "BOOMTIME\$";      DISDAY(2) := "PUNGENDAY\$";
DISDAY(3) := "PRICKLE-PRICKLE\$"; DISDAY(4) := "SETTING ORANGE\$";
DISSSN(0) := "CHAOS\$"; DISSSN(1) := "DISCORD\$"; DISSSN(2) := "CONFUSION\$";
DISSSN(3) := "BUREAUCRACY\$"; DISSSN(4) := "THE AFTERMATH\$";

% INPUT DATE SHOULD CONTAIN MM/DD/YYYY IN GREGORIAN CALENDAR          %
READ( GMONTH, SLASH1, GDAY, SLASH2, GYEAR );

IF GMONTH = 2 AND GDAY = 29
THEN WRITE( I_W := 4, S_W := 0, "SAINT TIB'S DAY IN THE Y.O.L.D. ", GYEAR + 1166 )
ELSE BEGIN
INTEGER YRDAY, SEASON, DAY, WKDAY;
YRDAY  := MLENGT(GMONTH)+GDAY;
SEASON := YRDAY DIV 73;
DAY    := YRDAY-SEASON*73;
WKDAY  := (YRDAY-1) REM 5;
WRITEONTEXT( DISDAY(WKDAY) );
WRITEON( S_W := 0, ", DAY ", I_W := 2, DAY, " OF " );
WRITEONTEXT( DISSSN(SEASON) );
WRITEON( S_W := 0, " IN THE Y.O.L.D ", I_W := 4, GYEAR + 1166 );
IF      DAY = 5  THEN BEGIN
WRITE( "CELEBRATE " );WRITEONTEXT( HOLY5(SEASON) );  WRITEON( "DAY"  )
END
ELSE IF DAY = 50 THEN BEGIN
WRITE( "CELEBRATE " );WRITEONTEXT( HOLY50(SEASON) ); WRITEON( "FLUX" )
END IF_FAY_EQ_5__DAY_EQ_50
END
END.```
Output:
```08/15/2017
BOOMTIME, DAY  8 OF BUREAUCRACY IN THE Y.O.L.D 3183

12/06/2020
SETTING ORANGE, DAY 48 OF THE AFTERMATH IN THE Y.O.L.D 3186

07/12/1969
PUNGENDAY, DAY 47 OF CONFUSION IN THE Y.O.L.D 3135

01/05/2005
SETTING ORANGE, DAY  5 OF CHAOS IN THE Y.O.L.D 3171
CELEBRATE MUNGDAY

09/26/1995
PRICKLE-PRICKLE, DAY 50 OF BUREAUCRACY IN THE Y.O.L.D 3161
CELEBRATE BUREFLUX

```

## AppleScript

```on gregorianToDiscordian(inputDate) -- Input: AppleScript date object.
(*
Discordian years are aligned with, and the same length as, Gregorian years.
Each has 73 5-day weeks and 5 73-day seasons. (73 * 5 = 365.)
The first day of a Discordian year is also that of its first week and first season.
In leap years, an extra day called "St. Tib's Day", is inserted between days 59 and 60.
It's considered to be outside the calendar, so the day after it is Setting Orange, Chaos 60,
not Sweetmorn, Chaos 61. Year 1 YOLD is 1166 BC, but this handler takes an AS date object
as its input and is only good for AD Gregorian dates. Since the Discordian calendar's an
American invention, the output here's in the US style: "Weekday, Season day, year".
*)
-- Calculate the input date's day-of-year number.
copy inputDate to startOfYear
tell startOfYear to set {its day, its month} to {1, January}
set dayOfYear to (inputDate - startOfYear) div days + 1

-- If it's a leap year, special-case St. Tib's Day, or adjust the day-of-year number if the day comes after that.
set y to inputDate's year
if ((y mod 4 is 0) and ((y mod 100 > 0) or (y mod 400 is 0))) then
if (dayOfYear is 60) then
set dayOfYear to "St. Tib's Day"
else if (dayOfYear > 60) then
set dayOfYear to dayOfYear - 1
end if
end if

-- Start the output text with either "St. Tib's Day" or the weekday, season, and day-of-season number.
if (dayOfYear is "St. Tib's Day") then
set outputText to dayOfYear
else
tell dayOfYear - 1
set dayOfWeek to it mod 5 + 1
set seasonNumber to it div 73 + 1
set dayOfSeason to it mod 73 + 1
end tell
set theWeekdays to {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"}
set theSeasons to {"Chaos ", "Discord ", "Confusion ", "Bureaucracy ", "The Aftermath "}
set outputText to (item dayOfWeek of theWeekdays) & ", " & (item seasonNumber of theSeasons) & dayOfSeason
end if

-- Append the Discordian year number and return the result.
return outputText & ", " & (y + 1166)
end gregorianToDiscordian

set ASDate to (current date)
set gregorianDate to ASDate's date string
set discordianDate to gregorianToDiscordian(ASDate)
return {Gregorian:gregorianDate, Discordian:discordianDate}
```
Output:
```{Gregorian:"Saturday 5 December 2020", Discordian:"Prickle-Prickle, The Aftermath 47, 3186"}
```

## AWK

```# DDATE.AWK - Gregorian to Discordian date contributed by Dan Nielsen
# syntax: GAWK -f DDATE.AWK [YYYYMMDD | YYYY-MM-DD | MM-DD-YYYY | DDMMMYYYY | YYYY] ...
# examples:
#   GAWK -f DDATE.AWK                    today
#   GAWK -f DDATE.AWK 20110722           one date
#   GAWK -f DDATE.AWK 20110722 20120229  two dates
#   GAWK -f DDATE.AWK 2012               yearly calendar
BEGIN {
split("Chaos,Discord,Confusion,Bureaucracy,The Aftermath",season_arr,",")
split("Sweetmorn,Boomtime,Pungenday,Prickle-Prickle,Setting Orange",weekday_arr,",")
split("Chaoflux,Discoflux,Confuflux,Bureflux,Afflux",season_holyday_arr,",")
split("31,28,31,30,31,30,31,31,30,31,30,31",days_in_month,",") # days per month in non leap year
split("0   31  59  90  120 151 181 212 243 273 304 334",rdt," ") # relative day table
mmm = "JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC"
#          1   2   3   4   5   6   7   8   9   10  11  12
if (ARGV[1] == "") { # use current date
ARGV[ARGC++] = strftime("%Y%m%d") # GAWK only
# ARGV[ARGC++] = dos_date() # any AWK
# timetab(arr); ARGV[ARGC++] = sprintf("%04d%02d%02d",arr["YEAR"],arr["MONTH"],arr["DAY"]) # TAWK only
}
for (argno=1; argno<=ARGC-1; argno++) { # validate command line arguments
print("")
x = toupper(ARGV[argno])
if (x ~ /^[0-9][0-9][0-9][0-9][01][0-9][0-3][0-9]\$/) { # YYYYMMDD
main(x)
}
else if (x ~ /^[0-9][0-9][0-9][0-9]-[01][0-9]-[0-3][0-9]\$/) { # YYYY-MM-DD
gsub(/-/,"",x)
main(x)
}
else if (x ~ /^[01][0-9]-[0-3][0-9]-[0-9][0-9][0-9][0-9]\$/) { # MM-DD-YYYY
main(substr(x,7,4) substr(x,1,2) substr(x,4,2))
}
else if (x ~ /^[0-3][0-9](JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)[0-9][0-9][0-9][0-9]\$/) { # DDMMMYYYY
main(sprintf("%04d%02d%02d",substr(x,6,4),int((match(mmm,substr(x,3,3))/4)+1),substr(x,1,2)))
}
else if (x ~ /^[0-9][0-9][0-9][0-9]\$/) { # YYYY
yearly_calendar(x)
}
else {
error("begin")
}
}
if (errors == 0) { exit(0) } else { exit(1) }
}
function main(x,  d,dyear,m,season_day,season_nbr,text,weekday_nbr,y,year_day) {
y = substr(x,1,4) + 0
m = substr(x,5,2) + 0
d = substr(x,7,2) + 0
days_in_month[2] = (leap_year(y) == 1) ? 29 : 28
if (m < 1 || m > 12 || d < 1 || d > days_in_month[m]+0) {
error("main")
return
}
year_day = rdt[m] + d
dyear = y + 1166 # Discordian year
season_nbr = int((year_day - 1 ) / 73) + 1
season_day = ((year_day - 1) % 73) + 1
weekday_nbr = ((year_day - 1 ) % 5) + 1
if (season_day == 5) {
text = ", " apostle_holyday_arr[season_nbr]
}
else if (season_day == 50) {
text = ", " season_holyday_arr[season_nbr]
}
if (leap_year(y) && m == 2 && d == 29) {
printf("%04d-%02d-%02d is St. Tib's day, Year of Our Lady of Discord %s\n",y,m,d,dyear)
}
else {
printf("%04d-%02d-%02d is %s, %s %s, Year of Our Lady of Discord %s%s\n",
y,m,d,weekday_arr[weekday_nbr],season_arr[season_nbr],season_day,dyear,text)
}
}
function leap_year(y) { # leap year: 0=no, 1=yes
return (y % 400 == 0 || (y % 4 == 0 && y % 100)) ? 1 : 0
}
function yearly_calendar(y,  d,m) {
days_in_month[2] = (leap_year(y) == 1) ? 29 : 28
for (m=1; m<=12; m++) {
for (d=1; d<=days_in_month[m]; d++) {
main(sprintf("%04d%02d%02d",y,m,d))
}
}
}
function dos_date(  arr,cmd,d,x) { # under Microsoft Windows
# XP - The current date is: MM/DD/YYYY
# 8  - The current date is: DOW MM/DD/YYYY
cmd = "DATE <NUL"
cmd | getline x
close(cmd) # close pipe
d = arr[split(x,arr," ")]
return sprintf("%04d%02d%02d",substr(d,7,4),substr(d,1,2),substr(d,4,2))
}
function error(x) {
printf("error: argument %d is invalid, %s, in %s\n",argno,ARGV[argno],x)
errors++
}
```
Output:
```GAWK -f DDATE.AWK
2011-08-22 is Prickle-Prickle, Bureaucracy 15, Year of Our Lady of Discord 3177

GAWK -f DDATE.AWK 20110722 20120229
2011-07-22 is Pungenday, Confusion 57, Year of Our Lady of Discord 3177
2012-02-29 is St. Tib's day, Year of Our Lady of Discord 3178
```

## BASIC

Works with: FreeBASIC
Translation of: PowerBASIC
```#INCLUDE "datetime.bi"

DECLARE FUNCTION julian(AS DOUBLE) AS INTEGER

SeasonNames:
DATA "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"
Weekdays:
DATA "Setting Orange", "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle"
DaysPreceding1stOfMonth:
'   jan feb mar apr may  jun  jul  aug  sep  oct  nov  dec
DATA 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334

DIM dyear AS INTEGER, dseason AS STRING, dday AS INTEGER, dweekday AS STRING
DIM tmpdate AS DOUBLE, jday AS INTEGER, result AS STRING
DIM L0 AS INTEGER

IF LEN(COMMAND\$) THEN
tmpdate = DATEVALUE(COMMAND\$)
ELSE
tmpdate = FIX(NOW())
END IF
dyear = YEAR(tmpdate) + 1166
IF (2 = MONTH(tmpdate)) AND (29 = DAY(tmpdate)) THEN
result = "Saint Tib's Day, " & STR\$(dyear) & " YOLD"
ELSE
jday = julian(tmpdate)
RESTORE SeasonNames
FOR L0 = 1 TO ((jday - 1) \ 73) + 1
NEXT
dday = (jday MOD 73)
IF 0 = dday THEN dday = 73
RESTORE Weekdays
FOR L0 = 1 TO (jday MOD 5) + 1
NEXT
result = dweekday & ", " & dseason & " " & TRIM\$(STR\$(dday)) & ", " & TRIM\$(STR\$(dyear)) & " YOLD"
END IF

? result
END

FUNCTION julian(d AS DOUBLE) AS INTEGER
'doesn't account for leap years (not needed for ddate)
DIM tmp AS INTEGER, L1 AS INTEGER
RESTORE DaysPreceding1stOfMonth
FOR L1 = 1 TO MONTH(d)
NEXT
FUNCTION = tmp + DAY(d)
END FUNCTION
```
Output:
```"Discordian date.exe" 19-10-2015
Boomtime, Bureaucracy 73, 3181 YOLD```

## Batch File

```@echo off
goto Parse

Discordian Date Converter:

Usage:
ddate
ddate /v
ddate /d isoDate
ddate /v /d isoDate

:Parse
shift
if "%0"==""   goto Prologue
if "%0"=="/v" set Verbose=1
if "%0"=="/d" set dateToTest=%1
if "%0"=="/d" shift
goto Parse

:Prologue
if "%dateToTest%"=="" set dateToTest=%date%
for %%a in (GYear GMonth GDay GMonthName GWeekday GDayThisYear) do set %%a=fnord
for %%a in (DYear DMonth DDay DMonthName DWeekday) do set %%a=MUNG
goto Start

:Start
for /f "tokens=1,2,3 delims=/:;-. " %%a in ('echo %dateToTest%') do (
set GYear=%%a
set GMonth=%%b
set GDay=%%c
)
goto GMonthName

:GMonthName
if %GMonth% EQU  1	set GMonthName=January
if %GMonth% EQU  2	set GMonthName=February
if %GMonth% EQU  3	set GMonthName=March
if %GMonth% EQU  4	set GMonthName=April
if %GMonth% EQU  5	set GMonthName=May
if %GMonth% EQU  6	set GMonthName=June
if %GMonth% EQU  7	set GMonthName=July
if %GMonth% EQU  8	set GMonthName=August
if %GMonth% EQU  9	set GMonthName=September
if %GMonth% EQU 10	set GMonthName=October
if %GMonth% EQU 11	set GMonthName=November
if %GMonth% EQU 12	set GMonthName=December
goto GLeap

:GLeap
set /a CommonYear=GYear %% 4
set /a CommonCent=GYear %% 100
set GLeap=0
if %CommonYear% EQU 0 set GLeap=1
if %CommonCent% EQU 0 set GLeap=0
if %CommonQuad% EQU 0 set GLeap=1
goto GDayThisYear

:GDayThisYear
set GDayThisYear=%GDay%
if %GMonth% GTR 11                  set /a GDayThisYear=%GDayThisYear%+30
if %GMonth% GTR 10                  set /a GDayThisYear=%GDayThisYear%+31
if %GMonth% GTR  9                  set /a GDayThisYear=%GDayThisYear%+30
if %GMonth% GTR  8                  set /a GDayThisYear=%GDayThisYear%+31
if %GMonth% GTR  7                  set /a GDayThisYear=%GDayThisYear%+31
if %GMonth% GTR  6                  set /a GDayThisYear=%GDayThisYear%+30
if %GMonth% GTR  5                  set /a GDayThisYear=%GDayThisYear%+31
if %GMonth% GTR  4                  set /a GDayThisYear=%GDayThisYear%+30
if %GMonth% GTR  3                  set /a GDayThisYear=%GDayThisYear%+31
if %GMonth% GTR  2 if %GLeap% EQU 1 set /a GDayThisYear=%GDayThisYear%+29
if %GMonth% GTR  2 if %GLeap% EQU 0 set /a GDayThisYear=%GDayThisYear%+28
if %GMonth% GTR  1                  set /a GDayThisYear=%GDayThisYear%+31
goto DYear

:DYear
set /a DYear=GYear+1166
goto DMonth

:DMonth
set DMonth=1
set DDay=%GDayThisYear%
if %DDay% GTR 73 (
set /a DDay=%DDay%-73
set /a DMonth=%DMonth%+1
)
if %DDay% GTR 73 (
set /a DDay=%DDay%-73
set /a DMonth=%DMonth%+1
)
if %DDay% GTR 73 (
set /a DDay=%DDay%-73
set /a DMonth=%DMonth%+1
)
if %DDay% GTR 73 (
set /a DDay=%DDay%-73
set /a DMonth=%DMonth%+1
)
goto DDay

:DDay
if %GLeap% EQU 1 (
if %GDayThisYear% GEQ 61 (
set /a DDay=%DDay%-1
)
)
if %DDay% EQU 0 (
set /a DDay=73
set /a DMonth=%DMonth%-1
)
goto DMonthName

:DMonthName
if %DMonth% EQU 1 set DMonthName=Chaos
if %DMonth% EQU 2 set DMonthName=Discord
if %DMonth% EQU 3 set DMonthName=Confusion
if %DMonth% EQU 4 set DMonthName=Bureaucracy
if %DMonth% EQU 5 set DMonthName=Aftermath
goto DTib

:DTib
set DTib=0
if %GDayThisYear% EQU 60 if %GLeap% EQU 1 set DTib=1
if %GLeap% EQU 1 if %GDayThisYear% GTR 60 set /a GDayThisYear=%GDayThisYear%-1
set DWeekday=%GDayThisYear%
goto DWeekday

:DWeekday
if %DWeekday% LEQ 5 goto _DWeekday
set /a DWeekday=%DWeekday%-5
goto DWeekday
:_DWeekday
if %DWeekday% EQU 1 set DWeekday=Sweetmorn
if %DWeekday% EQU 2 set DWeekday=Boomtime
if %DWeekday% EQU 3 set DWeekday=Pungenday
if %DWeekday% EQU 4 set DWeekday=Prickle-Prickle
if %DWeekday% EQU 5 set DWeekday=Setting Orange
goto GWeekday

:GWeekday
goto GEnding

:GEnding
set GEnding=th
for %%a in (1 21 31) do	if %GDay% EQU %%a set GEnding=st
for %%a in (2 22) do 	if %GDay% EQU %%a set GEnding=nd
for %%a in (3 23) do	if %GDay% EQU %%a set GEnding=rd
goto DEnding

:DEnding
set DEnding=th
for %%a in (1 21 31 41 51 61 71) do if %Dday% EQU %%a set DEnding=st
for %%a in (2 22 32 42 52 62 72) do if %Dday% EQU %%a set DEnding=nd
for %%a in (3 23 33 43 53 63 73) do if %Dday% EQU %%a set DEnding=rd
goto Display

:Display
if "%Verbose%"=="1" goto Display2
echo.
if %DTib% EQU 1 (
echo St. Tib's Day, %DYear%
) else echo %DWeekday%, %DMonthName% %DDay%%DEnding%, %DYear%
goto Epilogue

:Display2
echo.
echo  Gregorian: %GMonthName% %GDay%%GEnding%, %GYear%
if %DTib% EQU 1 (
echo Discordian: St. Tib's Day, %DYear%
) else echo Discordian: %DWeekday%, %DMonthName% %DDay%%DEnding%, %DYear%
goto Epilogue

:Epilogue
set Verbose=
set dateToTest=
echo.

:End```
Output:
```H:\>ddate

Pungenday, Confusion 12th, 3182

H:\>ddate /v

Gregorian: June 07th, 2016
Discordian: Pungenday, Confusion 12th, 3182

H:\>ddate /d 2016-02-28

Prickle-Prickle, Chaos 59th, 3182

H:\>ddate /v /d 2016-02-28

Gregorian: February 28th, 2016
Discordian: Prickle-Prickle, Chaos 59th, 3182

H:\>ddate /v /d 2016-02-29

Gregorian: February 29th, 2016
Discordian: St. Tib's Day, 3182

H:\>ddate /d 2016-02-29

St. Tib's Day, 3182

H:\>
```

This program assumes the date is in ISO order (yyyy-mm-dd) and has leading zeros. It also assumes the system date is similarly formatted, which is atypical on Windows machines.

Built on CMD.EXE version 5.1.2600.5512 (xpsp.080413-2111).

## BBC BASIC

```      INSTALL @lib\$+"DATELIB"

PRINT "01/01/2011 -> " FNdiscordian("01/01/2011")
PRINT "05/01/2011 -> " FNdiscordian("05/01/2011")
PRINT "28/02/2011 -> " FNdiscordian("28/02/2011")
PRINT "01/03/2011 -> " FNdiscordian("01/03/2011")
PRINT "22/07/2011 -> " FNdiscordian("22/07/2011")
PRINT "31/12/2011 -> " FNdiscordian("31/12/2011")

PRINT "01/01/2012 -> " FNdiscordian("01/01/2012")
PRINT "05/01/2012 -> " FNdiscordian("05/01/2012")
PRINT "28/02/2012 -> " FNdiscordian("28/02/2012")
PRINT "29/02/2012 -> " FNdiscordian("29/02/2012")
PRINT "01/03/2012 -> " FNdiscordian("01/03/2012")
PRINT "22/07/2012 -> " FNdiscordian("22/07/2012")
PRINT "31/12/2012 -> " FNdiscordian("31/12/2012")
END

DEF FNdiscordian(date\$)
LOCAL Season\$(), Weekday\$(), mjd%, year%, day%
DIM Season\$(4), Weekday\$(4)
Season\$() =  "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"
Weekday\$() = "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"

year% = FN_year(mjd%)

IF FN_month(mjd%)=2 AND FN_day(mjd%)=29 THEN
= "St. Tib's Day, YOLD " + STR\$(year% + 1166)
ENDIF

IF FN_month(mjd%) < 3 THEN
day% = mjd% - FN_mjd(1, 1, year%)
ELSE
day% = mjd% - FN_mjd(1, 3, year%) + 59
ENDIF
= Weekday\$(day% MOD 5) + ", " + STR\$(day% MOD 73 + 1) + " " + \
\ Season\$(day% DIV 73) + ", YOLD " + STR\$(year% + 1166)
```
Output:
```01/01/2011 -> Sweetmorn, 1 Chaos, YOLD 3177
05/01/2011 -> Setting Orange, 5 Chaos, YOLD 3177
28/02/2011 -> Prickle-Prickle, 59 Chaos, YOLD 3177
01/03/2011 -> Setting Orange, 60 Chaos, YOLD 3177
22/07/2011 -> Pungenday, 57 Confusion, YOLD 3177
31/12/2011 -> Setting Orange, 73 The Aftermath, YOLD 3177
01/01/2012 -> Sweetmorn, 1 Chaos, YOLD 3178
05/01/2012 -> Setting Orange, 5 Chaos, YOLD 3178
28/02/2012 -> Prickle-Prickle, 59 Chaos, YOLD 3178
29/02/2012 -> St. Tib's Day, YOLD 3178
01/03/2012 -> Setting Orange, 60 Chaos, YOLD 3178
22/07/2012 -> Pungenday, 57 Confusion, YOLD 3178
31/12/2012 -> Setting Orange, 73 The Aftermath, YOLD 3178
```

## Befunge

Reads the date to convert from stdin as three separate numeric inputs (year, month, and day).

```0" :raeY">:#,_&>\" :htnoM">:#,_&>04p" :yaD">:#,_\$&>55+,1-:47*v
v"f I".+1%,,,,"Day I":\$_:#<0#!4#:p#-4#1g4-#0+#<<_v#!*!-2g40!-<
>"o",,,/:5+*66++:4>g#<:#44#:9#+*#1-#,_\$\$0 v_v#!< >\$ 0 "yaD " v
@,+55.+*+92"j"\$_,#!>#:<", in the YOLD"*84 <.>,:^ :"St. Tib's"<
\$# #"#"##"#"Chaos\$Discord\$Confusion\$Bureaucracy\$The Aftermath\$
```
Output:

(multiple runs)

```Year: 2015
Month: 10
Day: 19

Day 73 of Bureaucracy, in the YOLD 3181

Year: 2012
Month: 2
Day: 29

St. Tib's Day, in the YOLD 3178

Year: 2010
Month: 7
Day: 22

Day 57 of Confusion, in the YOLD 3176```

## C

For the source code of `ddate` in util-linux package, see [[1]].

```#include <stdlib.h>
#include <stdio.h>
#include <time.h>

#define day_of_week( x ) ((x) == 1 ? "Sweetmorn" :\
(x) == 2 ? "Boomtime" :\
(x) == 3 ? "Pungenday" :\
(x) == 4 ? "Prickle-Prickle" :\
"Setting Orange")

#define season( x ) ((x) == 0 ? "Chaos" :\
(x) == 1 ? "Discord" :\
(x) == 2 ? "Confusion" :\
(x) == 3 ? "Bureaucracy" :\
"The Aftermath")

#define date( x ) ((x)%73 == 0 ? 73 : (x)%73)

#define leap_year( x ) ((x) % 400 == 0 || (((x) % 4) == 0 && (x) % 100))

char * ddate( int y, int d ){
int dyear = 1166 + y;
char * result = malloc( 100 * sizeof( char ) );

if( leap_year( y ) ){
if( d == 60 ){
sprintf( result, "St. Tib's Day, YOLD %d", dyear );
return result;
} else if( d >= 60 ){
-- d;
}
}

sprintf( result, "%s, %s %d, YOLD %d",
day_of_week(d%5), season(((d%73)==0?d-1:d)/73 ), date( d ), dyear );

return result;
}

int day_of_year( int y, int m, int d ){
int month_lengths[ 12 ] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

for( ; m > 1; m -- ){
d += month_lengths[ m - 2 ];
if( m == 3 && leap_year( y ) ){
++ d;
}
}
return d;
}

int main( int argc, char * argv[] ){
time_t now;
struct tm * now_time;
int year, doy;

if( argc == 1 ){
now = time( NULL );
now_time = localtime( &now );
year = now_time->tm_year + 1900; doy = now_time->tm_yday + 1;
} else if( argc == 4 ){
year = atoi( argv[ 1 ] ); doy = day_of_year( atoi( argv[ 1 ] ), atoi( argv[ 2 ] ), atoi( argv[ 3 ] ) );
}

char * result = ddate( year, doy );
puts( result );
free( result );

return 0;
}
```

Demonstration:

```\$ ./ddate 2015 10 19
Boomtime, Bureaucracy 73, YOLD 3181
\$ ./ddate 7 1 2011
Sweetmorn, The Aftermath 40, YOLD 1173
\$ ./ddate 2011 1 7
Boomtime, Chaos 7, YOLD 3177
\$ ./ddate 2012 2 28
Prickle-Prickle, Chaos 59, YOLD 3178
\$ ./ddate 2012 2 29
St. Tib's Day, YOLD 3178
\$ ./ddate 2012 3 1
Setting Orange, Chaos 60, YOLD 3178
\$ ./ddate 2010 7 22
Pungenday, Confusion 57, YOLD 3176
\$ ./ddate # today is Jan 4, 2016
Prickle-Prickle, Chaos 4, YOLD 3182```

## C#

```using System;

public static class DiscordianDate
{
static readonly string[] seasons = { "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath" };
static readonly string[] weekdays = { "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange" };
static readonly string[] holidays = { "Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux" };

public static string Discordian(this DateTime date) {
string yold = \$" in the YOLD {date.Year + 1166}.";
int dayOfYear = date.DayOfYear;

if (DateTime.IsLeapYear(date.Year)) {
if (dayOfYear == 60) return "St. Tib's day" + yold;
else if (dayOfYear > 60) dayOfYear--;
}
dayOfYear--;

int seasonDay = dayOfYear % 73 + 1;
int seasonNr = dayOfYear / 73;
int weekdayNr = dayOfYear % 5;
string holyday = "";

if (seasonDay == 5)       holyday = \$" Celebrate {apostles[seasonNr]}!";
else if (seasonDay == 50) holyday = \$" Celebrate {holidays[seasonNr]}!";
return \$"{weekdays[weekdayNr]}, day {seasonDay} of {seasons[seasonNr]}{yold}{holyday}";
}

public static void Main() {
foreach (var (day, month, year) in new [] {
(1, 1, 2010),
(5, 1, 2010),
(19, 2, 2011),
(28, 2, 2012),
(29, 2, 2012),
(1, 3, 2012),
(19, 3, 2013),
(3, 5, 2014),
(31, 5, 2015),
(22, 6, 2016),
(15, 7, 2016),
(12, 8, 2017),
(19, 9, 2018),
(26, 9, 2018),
(24, 10, 2019),
(8, 12, 2020),
(31, 12, 2020)
})
{
Console.WriteLine(\$"{day:00}-{month:00}-{year:00} = {new DateTime(year, month, day).Discordian()}");
}
}

}
```
Output:
```01-01-2010 = Sweetmorn, day 1 of Chaos in the YOLD 3176.
05-01-2010 = Setting Orange, day 5 of Chaos in the YOLD 3176. Celebrate Mungday!
19-02-2011 = Setting Orange, day 50 of Chaos in the YOLD 3177. Celebrate Chaoflux!
28-02-2012 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178.
29-02-2012 = St. Tib's day in the YOLD 3178.
01-03-2012 = Setting Orange, day 60 of Chaos in the YOLD 3178.
19-03-2013 = Pungenday, day 5 of Discord in the YOLD 3179. Celebrate Mojoday!
03-05-2014 = Pungenday, day 50 of Discord in the YOLD 3180. Celebrate Discoflux!
31-05-2015 = Sweetmorn, day 5 of Confusion in the YOLD 3181. Celebrate Syaday!
22-06-2016 = Pungenday, day 27 of Confusion in the YOLD 3182.
15-07-2016 = Sweetmorn, day 50 of Confusion in the YOLD 3182. Celebrate Confuflux!
12-08-2017 = Prickle-Prickle, day 5 of Bureaucracy in the YOLD 3183. Celebrate Zaraday!
19-09-2018 = Boomtime, day 43 of Bureaucracy in the YOLD 3184.
26-09-2018 = Prickle-Prickle, day 50 of Bureaucracy in the YOLD 3184. Celebrate Bureflux!
24-10-2019 = Boomtime, day 5 of The Aftermath in the YOLD 3185. Celebrate Maladay!
08-12-2020 = Boomtime, day 50 of The Aftermath in the YOLD 3186. Celebrate Afflux!
31-12-2020 = Setting Orange, day 73 of The Aftermath in the YOLD 3186.```

## C++

```#include <iostream>
#include <algorithm>
#include <vector>
#include <sstream>
#include <iterator>
using namespace std;
class myTuple
{
public:
void set( int a, int b, string c ) { t.first.first = a; t.first.second = b; t.second = c; }
bool operator == ( pair<int, int> p ) { return p.first == t.first.first && p.second == t.first.second; }
string second() { return t.second; }
private:
pair<pair<int, int>, string> t;
};
class discordian
{
public:
discordian() {
myTuple t;
t.set( 5, 1, "Mungday" ); holyday.push_back( t ); t.set( 19, 2, "Chaoflux" ); holyday.push_back( t );
t.set( 29, 2, "St. Tib's Day" ); holyday.push_back( t ); t.set( 19, 3, "Mojoday" ); holyday.push_back( t );
t.set( 3, 5, "Discoflux" ); holyday.push_back( t ); t.set( 31, 5, "Syaday" ); holyday.push_back( t );
t.set( 15, 7, "Confuflux" ); holyday.push_back( t ); t.set( 12, 8, "Zaraday" ); holyday.push_back( t );
t.set( 26, 9, "Bureflux" ); holyday.push_back( t ); t.set( 24, 10, "Maladay" ); holyday.push_back( t );
t.set( 8, 12, "Afflux" ); holyday.push_back( t );
seasons.push_back( "Chaos" ); seasons.push_back( "Discord" ); seasons.push_back( "Confusion" );
seasons.push_back( "Bureaucracy" ); seasons.push_back( "The Aftermath" );
wdays.push_back( "Setting Orange" ); wdays.push_back( "Sweetmorn" ); wdays.push_back( "Boomtime" );
wdays.push_back( "Pungenday" ); wdays.push_back( "Prickle-Prickle" );
}
void convert( int d, int m, int y ) {
if( d == 0 || m == 0 || m > 12 || d > getMaxDay( m, y ) ) {
cout << "\nThis is not a date!";
return;
}
vector<myTuple>::iterator f = find( holyday.begin(), holyday.end(), make_pair( d, m ) );
int dd = d, day, wday, sea,  yr = y + 1166;
for( int x = 1; x < m; x++ )
dd += getMaxDay( x, 1 );
day = dd % 73; if( !day ) day = 73;
wday = dd % 5;
sea  = ( dd - 1 ) / 73;
if( d == 29 && m == 2 && isLeap( y ) ) {
cout << ( *f ).second() << " " << seasons[sea] << ", Year of Our Lady of Discord " << yr;
return;
}
cout << wdays[wday] << " " << seasons[sea] << " " << day;
if( day > 10 && day < 14 ) cout << "th";
else switch( day % 10) {
case 1: cout << "st"; break;
case 2: cout << "nd"; break;
case 3: cout << "rd"; break;
default: cout << "th";
}
cout << ", Year of Our Lady of Discord " << yr;
if( f != holyday.end() ) cout << " - " << ( *f ).second();
}
private:
int getMaxDay( int m, int y ) {
int dd[] = { 0, 31, isLeap( y ) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; return dd[m];
}
bool isLeap( int y ) {
bool l = false;
if( !( y % 4 ) ) {
if( y % 100 ) l = true;
else if( !( y % 400 ) ) l = true;
}
return l;
}
vector<myTuple> holyday; vector<string> seasons, wdays;
};
int main( int argc, char* argv[] ) {
string date; discordian disc;
while( true ) {
cout << "Enter a date (dd mm yyyy) or 0 to quit: "; getline( cin, date ); if( date == "0" ) break;
if( date.length() == 10 ) {
istringstream iss( date );
vector<string> vc;
copy( istream_iterator<string>( iss ), istream_iterator<string>(), back_inserter<vector<string> >( vc ) );
disc.convert( atoi( vc[0].c_str() ), atoi( vc[1].c_str() ), atoi( vc[2].c_str() ) );
cout << "\n\n\n";
} else cout << "\nIs this a date?!\n\n";
}
return 0;
}
```
Output:
```
Enter a date (dd mm yyyy) or 0 to quit: 19 10 2015
Boomtime, Bureaucracy 73rd, Year of Our Lady of Discord 3181
Enter a date (dd mm yyyy) or 0 to quit: 08 06 2015
Prickle-Prickle, Confusion 13th, Year of Our Lady of Discord 3181
Enter a date (dd mm yyyy) or 0 to quit: 23 06 2015
Prickle-Prickle, Confusion 28th, Year of Our Lady of Discord 3181
Enter a date (dd mm yyyy) or 0 to quit: 29 02 2016
St. Tib's Day, Year of Our Lady of Discord 3182
Enter a date (dd mm yyyy) or 0 to quit: 05 01 2016
Setting Orange, Chaos 5th, Year of Our Lady of Discord 3182 - Mungday
Enter a date (dd mm yyyy) or 0 to quit: 26 08 2016
Pungenday, Bureaucracy 19th, Year of Our Lady of Discord 3182

```

## Clojure

```(require '[clj-time.core :as tc])

(def seasons ["Chaos" "Discord" "Confusion" "Bureaucracy" "The Aftermath"])
(def weekdays ["Sweetmorn" "Boomtime" "Pungenday" "Prickle-Prickle" "Setting Orange"])
(def year-offset 1166)

(defn leap-year? [year]
(= 29 (tc/number-of-days-in-the-month year 2)))

(defn discordian-day [day leap]
(let [offset (if (and leap (>= day 59)) 1 0)
day-off (- day offset)
day-num (inc (rem day-off 73))
season (seasons (quot day-off 73))
weekday (weekdays (mod day-off 5))]
(if (and (= day 59) (= offset 1))
"St. Tib's Day"
(str weekday ", " season " " day-num))))

(defn discordian-date [year month day]
(let [day-of-year (dec (.getDayOfYear (tc/date-time year month day)))
dday (discordian-day day-of-year (leap-year? year))]
(format "%s, YOLD %s" dday (+ year year-offset))))
```
Output:
```user=> (discordian-date 2010 7 22)
"Pungenday, Confusion 57, YOLD 3176"
user=> (discordian-date 2012 2 28)
"Prickle-Prickle, Chaos 59, YOLD 3178"
user=> (discordian-date 2012 2 29)
"St. Tib's Day, YOLD 3178"
user=> (discordian-date 2012 3 1)
"Setting Orange, Chaos 60, YOLD 3178"
user=> (discordian-date 2012 12 31)
"Setting Orange, The Aftermath 73, YOLD 3178"
user=> (discordian-date 2013 12 31)
"Setting Orange, The Aftermath 73, YOLD 3179"```

## CLU

```% This program needs to be merged with PCLU's "useful.lib",
% so it can use get_argv to read the command line.
%
% pclu -merge \$CLUHOME/lib/useful.lib -compile cmdline.clu

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Represent a day in the Discordian calendar %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
eris_date = cluster is from_greg_y_m_d,
from_date,
get_year,
get_day,
get_season,
get_weekday,
get_day_name,
get_holyday,
get_format
greyface = 1166

% A Discordian day is either St. Tib's day
% or a day in a season
season_day = struct[season, day: int]
eris_day = oneof[st_tibs: null, season_day: season_day]

% A Discordian date is a day in a year
rep = struct[year: int, day: eris_day]

% Offset of each Gregorian month in a non-leap year
own month_offset: sequence[int] := sequence[int]\$[
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
]

% Length of each Gregorian month in a non-leap year
own month_length: sequence[int] := sequence[int]\$[
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
]

own week_days: sequence[string] := sequence[string]\$[
"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle",
"Setting Orange"
]

own seasons: sequence[string] := sequence[string]\$[
"Chaos", "Discord", "Confusion", "Bureacuracy",
"The Aftermath"
]

own apostle_holydays: sequence[string] := sequence[string]\$[
]

own season_holydays: sequence[string] := sequence[string]\$[
"Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"
]

% Check if a Gregorian year is a leap year
is_leap = proc (year: int) returns (bool)
if year // 4 ~= 0 then return(false)
elseif year // 100 ~= 0 then return(true)
elseif year // 400 ~= 0 then return(false)
else return(true)
end
end is_leap

% Convert a Gregorian date to a Discordian date
from_greg_y_m_d = proc (year, month, day: int)
returns (cvt) signals (invalid)
% Make sure the month is valid
if month<1 cor month>12 then signal invalid end

% Saint Tib's Day?
if month=2 cand day=29 then
% Only valid in leap years
if ~is_leap(year) then signal invalid end
return(rep\${year: year+greyface, day: eris_day\$make_st_tibs(nil)})
end

% If not, make sure the day of the month is valid
if day<1 cor day>month_length[month] then signal invalid end

% The Discordian calendar doesn't consider Saint Tib's Day
% part of a season, so we can use the day number for a non-leap
% year even in a leap year
year_day: int := (day + month_offset[month]) - 1
sd: season_day := season_day\${
season: year_day / 73 + 1,
day: year_day // 73 + 1
}
return(rep\${year: year+greyface,
day: eris_day\$make_season_day(sd)})
end from_greg_y_m_d

% Convert a CLU 'date' object to a Discordian date (ignoring the time)
from_date = proc (d: date) returns (cvt) signals (invalid)
return(down(from_greg_y_m_d(d.year, d.month, d.day)))
resignal invalid
end from_date

% Retrieve year, season, day, weekday number
get_year = proc (d: cvt) returns (int) return(d.year) end get_year

get_day = proc (d: cvt) returns (int) signals (st_tibs)
tagcase d.day
tag st_tibs: signal st_tibs
tag season_day (s: season_day): return(s.day)
end
end get_day

get_season = proc (d: cvt) returns (int) signals (st_tibs)
tagcase d.day
tag st_tibs: signal st_tibs
tag season_day (s: season_day): return(s.season)
end
end get_season

get_weekday = proc (d: cvt) returns (int) signals (st_tibs)
day: int := up(d).day resignal st_tibs
season: int := up(d).season resignal st_tibs
weekday: int := ( (season-1)*73 + (day-1) ) // 5 + 1
return( weekday )
end get_weekday

% Retrieve formatted day in year
get_day_name = proc (d: cvt) returns (string)
begin
fmt: stream := stream\$create_output()
stream\$puts(fmt, week_days[up(d).weekday])
stream\$puts(fmt, ", day " || int\$unparse(up(d).day))
stream\$puts(fmt, " of " || seasons[up(d).season])
return(stream\$get_contents(fmt))
end except when st_tibs:
return("St. Tib's Day")
end
end get_day_name

% Retrieve holyday name if there is one
get_holyday = proc (d: cvt) returns (string) signals (no_holyday)
begin
if up(d).day = 5 then return(apostle_holydays[up(d).season])
elseif up(d).day = 50 then return(season_holydays[up(d).season])
else signal no_holyday
end
end except when st_tibs:
signal no_holyday  % St. Tib's Day is not a normal holyday
end
end get_holyday

% Retrieve long format
get_format = proc (d: cvt) returns (string)
fmt: stream := stream\$create_output()
stream\$puts(fmt, up(d).day_name)
stream\$puts(fmt, " in the YOLD ")
stream\$puts(fmt, int\$unparse(up(d).year))
stream\$puts(fmt, ": celebrate " || up(d).holyday) except when no_holyday: end
return(stream\$get_contents(fmt))
end get_format
end eris_date

% Parse a date string (MM/DD/YYYY) and return a date object
parse_date = proc (s: string) returns (date) signals (bad_format)
begin
parts: array[int] := array[int]\$[]
while true do
slash: int := string\$indexc('/', s)
if slash=0 then
break
else
s := string\$rest(s, slash+1)
end
end
if array[int]\$size(parts) ~= 3 then signal bad_format end
return(date\$create(parts[2], parts[1], parts[3], 0, 0, 0))
end parse_date

% Read date(s) from the command line, or use the current date,
% and convert to the Discordian date
start_up = proc ()
po: stream := stream\$primary_output()
args: sequence[string] := get_argv()
dates: array[date] := array[date]\$[]

if sequence[string]\$empty(args) then
% No argument - use today's date
stream\$puts(po, "Today is ")
else
% There are argument(s) - parse each of them
for arg: string in sequence[string]\$elements(args) do
end
end

% Convert all dates
for d: date in array[date]\$elements(dates) do
stream\$putl(po, eris_date\$from_date(d).format)
end
end start_up```
Output:
```\$ ./ddate
Today is Boomtime, day 45 of The Aftermath in the YOLD 3187

\$ ./ddate 4/27/2020 9/26/1995 2/29/1996 7/22/2011 1/5/2005
Boomtime, day 44 of Discord in the YOLD 3186
Prickle-Prickle, day 50 of Bureacuracy in the YOLD 3161: celebrate Bureflux
St. Tib's Day in the YOLD 3162
Pungenday, day 57 of Confusion in the YOLD 3177
Setting Orange, day 5 of Chaos in the YOLD 3171: celebrate Mungday```

## D

```import std.stdio, std.datetime, std.conv, std.string;

immutable seasons = ["Chaos", "Discord", "Confusion",
"Bureaucracy", "The Aftermath"],
weekday = ["Sweetmorn", "Boomtime", "Pungenday",
"Prickle-Prickle", "Setting Orange"],
holiday = ["Chaoflux", "Discoflux", "Confuflux",
"Bureflux", "Afflux"];

string discordianDate(in Date date) pure {
immutable dYear = text(date.year + 1166);

immutable isLeapYear = date.isLeapYear;
if (isLeapYear && date.month == 2 && date.day == 29)
return "St. Tib's Day, in the YOLD " ~ dYear;

immutable doy = (isLeapYear && date.dayOfYear >= 60) ?
date.dayOfYear - 1 :
date.dayOfYear;

immutable dsDay = (doy % 73)==0? 73:(doy % 73); // Season day.
if (dsDay == 5)
return apostle[doy / 73] ~ ", in the YOLD " ~ dYear;
if (dsDay == 50)
return holiday[doy / 73] ~ ", in the YOLD " ~ dYear;

immutable dSeas = seasons[(((doy%73)==0)?doy-1:doy) / 73];
immutable dWday = weekday[(doy - 1) % 5];

return format("%s, day %s of %s in the YOLD %s",
dWday, dsDay, dSeas, dYear);
}

unittest {
assert(Date(2010, 7, 22).discordianDate ==
"Pungenday, day 57 of Confusion in the YOLD 3176");
assert(Date(2012, 2, 28).discordianDate ==
"Prickle-Prickle, day 59 of Chaos in the YOLD 3178");
assert(Date(2012, 2, 29).discordianDate ==
"St. Tib's Day, in the YOLD 3178");
assert(Date(2012, 3, 1).discordianDate ==
"Setting Orange, day 60 of Chaos in the YOLD 3178");
assert(Date(2010, 1, 5).discordianDate ==
"Mungday, in the YOLD 3176");
assert(Date(2011, 5, 3).discordianDate ==
"Discoflux, in the YOLD 3177");
}

void main(string args[]) {
int yyyymmdd, day, mon, year, sign;
if (args.length == 1) {
(cast(Date)Clock.currTime).discordianDate.writeln;
return;
}
foreach (i, arg; args) {
if (i > 0) {
//writef("%d: %s: ", i, arg);
yyyymmdd = to!int(arg);
if (yyyymmdd < 0) {
sign = -1;
yyyymmdd = -yyyymmdd;
}
else {
sign = 1;
}
day = yyyymmdd % 100;
if (day == 0) {
day = 1;
}
mon = ((yyyymmdd - day) / 100) % 100;
if (mon == 0) {
mon = 1;
}
year = sign * ((yyyymmdd - day - 100*mon) / 10000);
writefln("%s", Date(year, mon, day).discordianDate);
}
}
}
```
Output:
```\$ ./ddate 20100722 20120228 20120229 20120301 20100105 20110503 20151019 00000101 -11660101
Pungenday, day 57 of Confusion in the YOLD 3176
Prickle-Prickle, day 59 of Chaos in the YOLD 3178
St. Tib's Day, in the YOLD 3178
Setting Orange, day 60 of Chaos in the YOLD 3178
Mungday, in the YOLD 3176
Discoflux, in the YOLD 3177
Boomtime, day 73 of Bureaucracy in the YOLD 3181
Sweetmorn, day 1 of Chaos in the YOLD 1166
Sweetmorn, day 1 of Chaos in the YOLD 0```

## Delphi

Translation of: D

Partial translation of D.

```program Discordian_date;

{\$APPTYPE CONSOLE}

uses
System.SysUtils,
System.DateUtils;

type
TDateTimeHelper = record helper for TDateTime
const
seasons: array of string = ['Chaos', 'Discord', 'Confusion', 'Bureaucracy',
'The Aftermath'];
weekday: array of string = ['Sweetmorn', 'Boomtime', 'Pungenday',
'Prickle-Prickle', 'Setting Orange'];
holiday: array of string = ['Chaoflux', 'Discoflux', 'Confuflux',
'Bureflux', 'Afflux'];
function DiscordianDate(): string;
end;

{ TDateTimeHelper }

function TDateTimeHelper.DiscordianDate: string;
var
isLeapYear: boolean;
begin
isLeapYear := IsInLeapYear(self);
var dYear := (YearOf(self) + 1166).ToString;
if isLeapYear and (MonthOf(self) = 2) and (dayof(self) = 29) then
exit('St. Tib''s Day, in the YOLD ' + dYear);

var doy := DayOfTheYear(self);
if isLeapYear and (doy >= 60) then
doy := doy - 1;

var dsDay := doy mod 73;

if dsDay = 0 then
dsDay := 73;

if dsDay = 5 then
exit(apostle[doy div 73] + ', in the YOLD ' + dYear);

if dsDay = 50 then
exit(holiday[doy div 73] + ', in the YOLD ' + dYear);

var dSeas: string;

if (doy mod 73) = 0 then
dSeas := seasons[(doy - 1) div 73]
else
dSeas := seasons[doy div 73];

var dWday := weekday[(doy - 1) mod 5];

Result := format('%s, day %d of %s in the YOLD %s', [dWday, dsDay, dSeas, dYear]);

end;

procedure Test();
begin
Assert(EncodeDate(2010, 7, 22).DiscordianDate =
'Pungenday, day 57 of Confusion in the YOLD 3176');
Assert(EncodeDate(2012, 2, 28).DiscordianDate =
'Prickle-Prickle, day 59 of Chaos in the YOLD 3178');
Assert(EncodeDate(2012, 2, 29).DiscordianDate = 'St. Tib''s Day, in the YOLD 3178');
Assert(EncodeDate(2012, 3, 1).DiscordianDate =
'Setting Orange, day 60 of Chaos in the YOLD 3178');
Assert(EncodeDate(2010, 1, 5).DiscordianDate = 'Mungday, in the YOLD 3176');
Assert(EncodeDate(2011, 5, 3).DiscordianDate = 'Discoflux, in the YOLD 3177');
writeln('OK');
end;

var
dt: TDateTime;
i: Integer;

begin
if ParamCount = 0 then
begin
writeln(now.DiscordianDate);
halt;
end;

for i := 1 to ParamCount do
begin
if not TryStrToDate(ParamStr(i), dt) then
Continue;
writeln(dt.DiscordianDate);
end;

end.
```

## EasyLang

```seasons\$[] = [ "Chaos" "Discord" "Confusion" "Bureaucracy" "The Aftermath" ]
weekday\$[] = [ "Sweetmorn" "Boomtime" "Pungenday" "Prickle-Prickle" "Setting Orange" ]
holiday\$[] = [ "Chaoflux" "Discoflux" "Confuflux" "Bureflux" "Afflux" ]
#
func leap x .
return if x mod 400 = 0 or x mod 4 = 0 and x mod 100 <> 0
.
func day_of_year y m d .
days[] = [ 31 28 31 30 31 30 31 31 30 31 30 31 ]
repeat
m -= 1
until m = 0
d += days[m]
if m = 2 and leap y = 1
d += 1
.
.
return d
.
func\$ ddate y m d .
doy = day_of_year y m d
dyear = y + 1166
if leap y = 1 and m = 2 and d = 29
return "St. Tib's Day, in the YOLD " & dyear
.
if leap y = 1 and doy >= 60
doy -= 1
.
dsday = doy mod1 73
dseason = doy div1 73
r\$ = weekday\$[doy mod1 5] & ", day " & dsday & " of " & seasons\$[dseason]
r\$ &= " in the YOLD " & dyear & "."
if dsday = 5
r\$ &= " Celebrate " & apostle\$[dseason] & "!"
elif dsday = 50
r\$ &= " Celebrate " & holiday\$[dseason] & "!"
.
return r\$
.
proc show d\$ . .
a[] = number strsplit d\$ "-"
write d\$ & " --> "
print ddate a[1] a[2] a[3]
.
show "2016-01-05"
show "2016-02-28"
show "2016-02-29"
show "2016-03-01"
show "2016-12-31"
show "2025-03-19"
show substr timestr systime 1 10```

## Euphoria

Translation of: D
```function isLeapYear(integer year)
return remainder(year,4)=0 and remainder(year,100)!=0 or remainder(year,400)=0
end function

constant YEAR = 1, MONTH = 2, DAY = 3, DAY_OF_YEAR = 8

constant month_lengths = {31,28,31,30,31,30,31,31,30,31,30,31}
function dayOfYear(sequence Date)
integer d
if length(Date) = DAY_OF_YEAR then
d = Date[DAY_OF_YEAR]
else
d = Date[DAY]
for i = Date[MONTH]-1 to 1 by -1 do
d += month_lengths[i]
if i = 2 and isLeapYear(Date[YEAR]) then
d += 1
end if
end for
end if
return d
end function

constant seasons = {"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"}
constant weekday = {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"}
constant holiday = {"Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"}

function discordianDate(sequence Date)
sequence dyear, dseas, dwday
integer  leap, doy, dsday
dyear = sprintf("%d",Date[YEAR]+1166)
leap = isLeapYear(Date[YEAR])
if leap and Date[MONTH] = 2 and Date[DAY] = 29 then
return "St. Tib's Day, in the YOLD " & dyear
end if

doy = dayOfYear(Date)
if leap and doy >= 60 then
doy -= 1
end if

dsday = remainder(doy,73)
if dsday = 5 then
return apostle[doy/73+1] & ", in the YOLD " & dyear
elsif dsday = 50 then
return holiday[doy/73+1] & ", in the YOLD " & dyear
end if

dseas = seasons[doy/73+1]
dwday = weekday[remainder(doy-1,5)+1]

return sprintf("%s, day %d of %s in the YOLD %s", {dwday, dsday, dseas, dyear})
end function

sequence today
today = date()
today[YEAR] += 1900
puts(1, discordianDate(today))```

## F#

```open System

let seasons = [| "Chaos"; "Discord"; "Confusion"; "Bureaucracy"; "The Aftermath" |]

let ddate (date:DateTime) =
let dyear = date.Year + 1166
let leapYear = DateTime.IsLeapYear(date.Year)

if leapYear && date.Month = 2 && date.Day = 29 then
sprintf "St. Tib's Day, %i YOLD" dyear
else
// compensate for St. Tib's Day
let dayOfYear = (if leapYear && date.DayOfYear >= 60 then date.DayOfYear - 1 else date.DayOfYear) - 1
let season, dday = Math.DivRem(dayOfYear, 73)
sprintf "%s %i, %i YOLD" seasons.[season] (dday+1) dyear

[<EntryPoint>]
let main argv =
let p = Int32.Parse
Seq.ofArray("2012-02-28 2012-02-29 2012-03-01 2010-07-22 2015-10-19 2015-10-20".Split())
|> Seq.map(fun (s:string) ->
let d = s.Split('-')
(s, DateTime(p(d.[0]),p(d.[1]),p(d.[2]))))
|> Seq.iter(fun (s,d) -> printfn "%s is %s" s (ddate d))
0
```
Output:
```2012-02-28 is Chaos 59, 3178 YOLD
2012-02-29 is St. Tib's Day, 3178 YOLD
2012-03-01 is Chaos 60, 3178 YOLD
2010-07-22 is Confusion 57, 3176 YOLD
2015-10-19 is Bureaucracy 73, 3181 YOLD
2015-10-20 is The Aftermath 1, 3181 YOLD```

## Fortran

```program discordianDate
implicit none
! Declare variables
character(32) :: arg
character(15) :: season,day,holyday
character(80) :: Output,fmt1,fmt2,fmt3
character(2) :: dayfix,f1,f2,f3,f4
integer :: i,j,k,daysofyear,dayofweek,seasonnum,yold,dayofseason,t1,t2,t3
integer,dimension(8) :: values
integer, dimension(12) :: daysinmonth
logical  :: isleapyear, isholyday, Pleapyear

! Get the current date
call date_and_time(VALUES=values)
! Set some values up to defaults
daysinmonth = (/ 31,28,31,30,31,30,31,31,30,31,30,31 /)
isleapyear = .false.
isholyday = .false.
! process any command line arguments
! using arguments dd mm yyyy
j = iargc()
do i = 1, iargc()
call getarg(i, arg)  ! fetches argument as a character string
if (j==3) then
if (i==1) then
read(arg,'(i2)') values(3)  ! convert to integer
endif
if (i==2) then
read(arg,'(i2)') values(2)  ! convert to integer
endif
if (i==3) then
read(arg,'(i4)') values(1)  ! convert to integer

endif
endif
if (j==2) then  ! arguments dd mm
if (i==1) then
read(arg,'(i2)') values(3)  ! convert to integer
endif
if (i==2) then
read(arg,'(i2)') values(2)  ! convert to integer
endif
endif
if (j==1) then ! argument dd
read(arg,'(i2)') values(3)  ! convert to integer
endif
end do

!Start the number crunching here

yold = values(1) + 1166
daysofyear = 0
if (values(2)>1) then
do i=1 , values(2)-1 , 1
daysofyear = daysofyear + daysinmonth(i)
end do
end if
daysofyear = daysofyear + values(3)
isholyday = .false.
isleapyear = Pleapyear(yold)
dayofweek = mod (daysofyear, 5)
seasonnum = ((daysofyear - 1) / 73) + 1
dayofseason = daysofyear - ((seasonnum - 1)  * 73)
k = mod(dayofseason,10)  ! just to get the day number postfix
select case (k)
case (1)
dayfix='st'
case (2)
dayfix='nd'
case (3)
dayfix='rd'
case default
dayfix='th'
end select
! except between 10th and 20th  where we always have 'th'
if (((dayofseason > 10) .and. (dayofseason < 20)) .eqv. .true.) then
dayfix = 'th'
end if
select case (Seasonnum)
case (1)
season ='Choas'
f4 = '5'
case (2)
season ='Discord'
f4 = '7'
case (3)
season ='Confusion'
f4 = '9'
case (4)
season ='Bureaucracy'
f4 = '10'
case (5)
season ='The Aftermath'
f4 = '13'
end select
select case (dayofweek)
case (0)
day='Setting Orange'
f2 = '14'
case (1)
day ='Sweetmorn'
f2 = '9'
case (2)
day = 'Boomtime'
f2 = '8'
case (3)
day = 'Pungenday'
f2 = '9'
case (4)
day = 'Prickle-Prickle'
f2 = '15'
end select
! check for holydays
select case (dayofseason)
case (5)
isholyday = .true.
select case (seasonnum)
case (1)
holyday ='Mungday'
f1 = '7'
case (2)
holyday = 'Mojoday'
f1 = '7'
case (3)
f1 = '6'
case (4)
f1 = '7'
case (5)
f1 = '7'
end select
Case (50)
isholyday = .true.
select case (seasonnum)
case (1)
holyday = 'Chaoflux'
f1 = '8'
case (2)
holyday = 'Discoflux'
f1 = '9'
case (3)
holyday = 'Confuflux'
f1 = '9'
case (4)
holyday = 'Bureflux'
f1 = '8'
case (5)
holyday = 'Afflux'
f1 = '6'
end select
end select

! Check if it is St. Tibbs day
if (isleapyear .eqv. .true.) then
if ((values(2) == 2) .and. (values(3) == 29)) then
isholyday = .true.
end if
end if
! Construct our format strings
f3 = "2"
if (dayofseason < 10) then
f3 = "1"
end if
fmt1 = "(a,i4)"
fmt2 = "(A,a" // f1 // ",A,A" // f2 // ",A,I" // f3 // ",A2,A,A" // f4 // ",A,I4)"
fmt3 = "(A,A" // f2 // ",A,I" // f3 //",A2,A,A" // f4 // ",A,I4)"
! print an appropriate line
if (isholyday .eqv. .true.) then
if (values(3) == 29) then
print fmt1,'Celebrate for today is St. Tibbs Day in the YOLD ',yold
else
print fmt2, 'Today is ',holyday, ' on ',day,' the ',dayofseason,dayfix,' day of ',season,' in the YOLD ',yold
end if
else   ! not a holyday
print fmt3, 'Today is ',day,' the ',dayofseason,dayfix, ' day of ',season,' in the YOLD ',yold
end if
end program discordianDate

! Function to check to see if this is a leap year returns true or false!

function Pleapyear(dloy) result(leaper)
implicit none
integer, intent(in) :: dloy
logical :: leaper
leaper = .false.
if (mod((dloy-1166),4) == 0)  then
leaper = .true.
end if
if (mod((dloy-1166),100) == 0) then
leaper = .false.
if (mod((dloy-1166),400)==0) then
leaper = .true.
end if
end if
end function Pleapyear
```
```compiled as ddate.
useage ./ddate
./ddate dd mm yyyy
```
Output:
```./ddate
Today is Pungenday the 56th day of The Aftermath in the YOLD 3184
./ddate 29 02 2020
Celebrate for today is St. Tibbs Day in the YOLD 3186
```

## FreeBASIC

Translation of: BASIC
```#Include "datetime.bi"

meses:
Data "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"
dias_laborales:
Data "Setting Orange", "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle"
dias_previos_al_1er_mes:
'   ene feb mar abr may  jun  jul  ago  sep  oct  nov  dic
Data 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334

Function cJuliano(d As Double) As Integer
'no tiene en cuenta los años bisiestos (no es necesario para ddate)
Dim tmp As Integer, i As Integer
Restore dias_previos_al_1er_mes
For i = 1 To Month(d)
Next i
Function = tmp + Day(d)
End Function

Sub cDiscordiano(Fecha As String)
Dim As Integer dyear, dday, j, jday
Dim As Double tempfecha = Datevalue(Fecha)
Dim As String ddate, dseason, dweekday

dyear = Year(tempfecha) + 1166
If (2 = Month(tempfecha)) And (29 = Day(tempfecha)) Then
ddate = "Saint Tib's Day, " & Str(dyear) & " YOLD"
Else
jday = cJuliano(tempfecha)
Restore meses
For j = 1 To ((jday - 1) \ 73) + 1
Next j
dday = (jday Mod 73)
If 0 = dday Then dday = 73
Restore dias_laborales
For j = 1 To (jday Mod 5) + 1
Next j
ddate = dweekday & ", " & dseason & " " & Trim(Str(dday)) & ", " & Trim(Str(dyear)) & " YOLD"
End If
Print Fecha & " -> " & ddate
End Sub

cDiscordiano("01/01/2020")
cDiscordiano("05/01/2020")
cDiscordiano("28/02/2020")
cDiscordiano("01/03/2020")
cDiscordiano("22/07/2020")
cDiscordiano("31/12/2020")
cDiscordiano("20/04/2022")
cDiscordiano("24/05/2020")
cDiscordiano("29/02/2020")
cDiscordiano("15/07/2019")
cDiscordiano("19/03/2025")
Sleep```
Output:
```01/01/2020 -> Sweetmorn, Chaos 1, 3186 YOLD
05/01/2020 -> Setting Orange, Chaos 5, 3186 YOLD
28/02/2020 -> Prickle-Prickle, Chaos 59, 3186 YOLD
01/03/2020 -> Setting Orange, Chaos 60, 3186 YOLD
22/07/2020 -> Pungenday, Confusion 57, 3186 YOLD
31/12/2020 -> Setting Orange, The Aftermath 73, 3186 YOLD
20/04/2022 -> Setting Orange, Discord 37, 3188 YOLD
24/05/2020 -> Prickle-Prickle, Discord 71, 3186 YOLD
29/02/2020 -> Saint Tib's Day, 3186 YOLD
15/07/2019 -> Sweetmorn, Confusion 50, 3185 YOLD
19/03/2025 -> Pungenday, Discord 5, 3191 YOLD
```

## Go

A package modeled after the time package in the Go standard library

```package ddate

import (
"strconv"
"strings"
"time"
)

// Predefined formats for DiscDate.Format
const (
DefaultFmt = "Pungenday, Discord 5, 3131 YOLD"
OldFmt     = `Today is Pungenday, the 5th day of Discord in the YOLD 3131
Celebrate Mojoday`
)

// Formats passed to DiscDate.Format are protypes for formated dates.
// Format replaces occurrences of prototype elements (the constant strings
// listed here) with values corresponding to the date being formatted.
// If the date is St. Tib's Day, the string from the first date element
// through the last is replaced with "St. Tib's Day".
const (
protoLongSeason  = "Discord"
protoShortSeason = "Dsc"
protoLongDay     = "Pungenday"
protoShortDay    = "PD"
protoOrdDay      = "5"
protoCardDay     = "5th"
protoHolyday     = "Mojoday"
protoYear        = "3131"
)

var (
longDay = []string{"Sweetmorn", "Boomtime", "Pungenday",
"Prickle-Prickle", "Setting Orange"}
shortDay   = []string{"SM", "BT", "PD", "PP", "SO"}
longSeason = []string{
"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"}
shortSeason = []string{"Chs", "Dsc", "Cfn", "Bcy", "Afm"}
holyday     = [][]string{{"Mungday", "Chaoflux"}, {"Mojoday", "Discoflux"},
)

type DiscDate struct {
StTibs bool
Dayy   int // zero based day of year, meaningless if StTibs is true
Year   int // gregorian + 1166
}

func New(eris time.Time) DiscDate {
t := time.Date(eris.Year(), 1, 1, eris.Hour(), eris.Minute(),
eris.Second(), eris.Nanosecond(), eris.Location())
bob := int(eris.Sub(t).Hours()) / 24
raw := eris.Year()
hastur := DiscDate{Year: raw + 1166}
if raw%4 == 0 && (raw%100 != 0 || raw%400 == 0) {
if bob > 59 {
bob--
} else if bob == 59 {
hastur.StTibs = true
return hastur
}
}
hastur.Dayy = bob
return hastur
}

func (dd DiscDate) Format(f string) (r string) {
var st, snarf string
var dateElement bool
f6 := func(proto, wibble string) {
if !dateElement {
snarf = r
dateElement = true
}
if st > "" {
r = ""
} else {
r += wibble
}
f = f[len(proto):]
}
f4 := func(proto, wibble string) {
if dd.StTibs {
st = "St. Tib's Day"
}
f6(proto, wibble)
}
season, day := dd.Dayy/73, dd.Dayy%73
for f > "" {
switch {
case strings.HasPrefix(f, protoLongDay):
f4(protoLongDay, longDay[dd.Dayy%5])
case strings.HasPrefix(f, protoShortDay):
f4(protoShortDay, shortDay[dd.Dayy%5])
case strings.HasPrefix(f, protoCardDay):
funkychickens := "th"
if day/10 != 1 {
switch day % 10 {
case 0:
funkychickens = "st"
case 1:
funkychickens = "nd"
case 2:
funkychickens = "rd"
}
}
f4(protoCardDay, strconv.Itoa(day+1)+funkychickens)
case strings.HasPrefix(f, protoOrdDay):
f4(protoOrdDay, strconv.Itoa(day+1))
case strings.HasPrefix(f, protoLongSeason):
f6(protoLongSeason, longSeason[season])
case strings.HasPrefix(f, protoShortSeason):
f6(protoShortSeason, shortSeason[season])
case strings.HasPrefix(f, protoHolyday):
if day == 4 {
r += holyday[season][0]
} else if day == 49 {
r += holyday[season][1]
}
f = f[len(protoHolyday):]
case strings.HasPrefix(f, protoYear):
r += strconv.Itoa(dd.Year)
f = f[4:]
default:
r += f[:1]
f = f[1:]
}
}
if st > "" {
r = snarf + st + r
}
return
}
```

Example program using above package

```package main

import (
"ddate"
"fmt"
"os"
"strings"
"time"
)

func main() {
pi := 1
fnord := ddate.DefaultFmt
if len(os.Args) > 1 {
switch os.Args[1][0] {
case '+':
pi++
fnord = os.Args[1][1:]
case '-':
usage()
}
}
var eris time.Time
switch len(os.Args) - pi {
case 0:
eris = time.Now()
case 3:
var err error
eris, err = time.Parse("2 1 2006", strings.Join(os.Args[pi:pi+3], " "))
if err != nil {
fmt.Println(err)
usage()
}
default:
usage()
}
fmt.Println(ddate.New(eris).Format(fnord))
}

func usage() {
fmt.Fprintf(os.Stderr, "usage: %s [+format] [day month year]\n", os.Args[0])
os.Exit(1)
}
```
Output:
```> ddate
Pungenday, Confusion 62, 3177 YOLD

> ddate 29 2 2012
St. Tib's Day, 3178 YOLD
```

```import Data.Time (isLeapYear)
import Data.Time.Calendar.MonthDay (monthAndDayToDayOfYear)
import Text.Printf (printf)

type Year = Integer
type Day = Int
type Month = Int

data DDate = DDate Weekday Season Day Year
| StTibsDay Year deriving (Eq, Ord)

data Season = Chaos
| Discord
| Confusion
| Bureaucracy
| TheAftermath
deriving (Show, Enum, Eq, Ord, Bounded)

data Weekday = Sweetmorn
| Boomtime
| Pungenday
| PricklePrickle
| SettingOrange
deriving (Show, Enum, Eq, Ord, Bounded)

instance Show DDate where
show (StTibsDay y) = printf "St. Tib's Day, %d YOLD" y
show (DDate w s d y) = printf "%s, %s %d, %d YOLD" (show w) (show s) d y

fromYMD :: (Year, Month, Day) -> DDate
fromYMD (y, m, d)
| leap && dayOfYear == 59 = StTibsDay yold
| leap && dayOfYear >= 60 = mkDDate \$ dayOfYear - 1
| otherwise               = mkDDate dayOfYear
where
yold = y + 1166
dayOfYear = monthAndDayToDayOfYear leap m d - 1
leap = isLeapYear y

mkDDate dayOfYear = DDate weekday season dayOfSeason yold
where
weekday = toEnum \$ dayOfYear `mod` 5
season = toEnum \$ dayOfYear `div` 73
dayOfSeason = 1 + dayOfYear `mod` 73
```

Examples:

```test = mapM_ display dates
where
display d = putStr (show d ++ " -> ") >> print (fromYMD d)
dates = [(2012,2,28)
,(2012,2,29)
,(2012,3,1)
,(2012,3,14)
,(2012,3,15)
,(2010,9,2)
,(2010,12,31)
,(2011,1,1)]
```
```λ> test
(2012,2,28) -> PricklePrickle, Chaos 59, 3178 YOLD
(2012,2,29) -> St. Tib's Day, 3178 YOLD
(2012,3,1) -> SettingOrange, Chaos 60, 3178 YOLD
(2012,3,14) -> Pungenday, Chaos 73, 3178 YOLD
(2012,3,15) -> PricklePrickle, Discord 1, 3178 YOLD
(2010,9,2) -> SettingOrange, Bureaucracy 26, 3176 YOLD
(2010,12,31) -> SettingOrange, TheAftermath 73, 3176 YOLD
(2011,1,1) -> Sweetmorn, Chaos 1, 3177 YOLD```

In GHCi we can also execute shell commands.

• Using Linux utility ddate
```*Main> :! ddate
Today is Setting Orange, the 26th day of Bureaucracy in the YOLD 3176

*Main> :! ddate 29 2 2012
Sint Tibs

*Main> :! ddate 2 9 2010
Setting Orange, Bureaucracy 26, 3176 YOLD```

## Icon and Unicon

This version is loosely based on a modified translation of the original ddate.c and like the original the leap year functionality is Julian not Gregorian.

```link printf

procedure main()
Demo(2010,1,1)
Demo(2010,7,22)
Demo(2012,2,28)
Demo(2012,2,29)
Demo(2012,3,1)
Demo(2010,1,5)
Demo(2011,5,3)
Demo(2012,2,28)
Demo(2012,2,29)
Demo(2012,3,1)
Demo(2010,7,22)
Demo(2012,12,22)
end

procedure Demo(y,m,d)      #: demo display
printf("%i-%i-%i = %s\n",y,m,d,DiscordianDateString(DiscordianDate(y,m,d)))
end

record DiscordianDateRecord(year,yday,season,sday,holiday)

procedure DiscordianDate(year,month,day)  #: Convert normal date to Discordian
static  cal
initial cal := [31,28,31,30,31,30,31,31,30,31,30,31]

ddate := DiscordianDateRecord(year+1166)
every (ddate.yday := day - 1) +:= cal[1 to month-1]   # zero origin
ddate.sday := ddate.yday

if ddate.year % 4 = 2 &  month = 2 & day = 29 then
ddate.holiday := 1   # Note: st tibs is outside of weekdays
else {
ddate.season  := (ddate.yday / 73) + 1
ddate.sday := (ddate.yday % 73) + 1
ddate.holiday := 1 + ddate.season * case ddate.sday of { 5 : 1; 50 : 2}
}
return ddate
end

procedure DiscordianDateString(ddate)   #: format a Discordian Date String
static days,seasons,holidays
initial {
days := ["Sweetmorn","Boomtime","Pungenday","Prickle-Prickle","Setting Orange"]
seasons := ["Chaos","Discord","Confusion","Bureaucracy","The Aftermath"]
holidays := ["St. Tib's Day","Mungday","Chaoflux","Mojoday","Discoflux",
}

return (( holidays[\ddate.holiday] || "," ) |
( days[1+ddate.yday%5] || ", day " ||
ddate.sday || " of " || seasons[ddate.season])) ||
" in the YOLD " || ddate.year
end
```
Output:
```2010-1-1 = Sweetmorn, day 1 of Chaos in the YOLD 3176
2010-7-22 = Pungenday, day 57 of Confusion in the YOLD 3176
2012-2-28 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178
2012-2-29 = St. Tib's Day, in the YOLD 3178
2012-3-1 = Setting Orange, day 60 of Chaos in the YOLD 3178
2010-1-5 = Mungday, in the YOLD 3176
2011-5-3 = Discoflux, in the YOLD 3177
2012-2-28 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178
2012-2-29 = St. Tib's Day, in the YOLD 3178
2012-3-1 = Setting Orange, day 60 of Chaos in the YOLD 3178
2010-7-22 = Pungenday, day 57 of Confusion in the YOLD 3176
2012-12-22 = Sweetmorn, day 64 of The Aftermath in the YOLD 3178```

## J

```require'dates'
leap=: _1j1 * 0 -/@:= 4 100 400 |/ {.@]
bs=: ((#:{.) + 0 j. *@[ * {:@]) +.
disc=: ((1+0 73 bs[ +^:(58<]) -/@todayno@(,: 1 1,~{.)@]) ,~1166+{.@])~ leap
```

Example use:

```   disc 2012 2 28
3178 1 59
disc 2012 2 29
3178 1 59j1
disc 2012 3 1
3178 1 60j1
disc 2012 12 31
3178 5 73j1
disc 2013 1 1
3179 1 1
disc 2100 12 31
3266 5 73
disc 2015 10 19
3181 4 73
disc 2000 3 13
3166 1 72j1
```

see talk page. But, in essence, this version uses season ordinals with a single imaginary day after the 59th of the first season, on leap years. This is implemented so that that imaginary day has been passed for all remaining days of a leap year.

## Java

```import java.util.Calendar;
import java.util.GregorianCalendar;

public class DiscordianDate {
final static String[] seasons = {"Chaos", "Discord", "Confusion",
"Bureaucracy", "The Aftermath"};

final static String[] weekday = {"Sweetmorn", "Boomtime", "Pungenday",
"Prickle-Prickle", "Setting Orange"};

final static String[] apostle = {"Mungday", "Mojoday", "Syaday",

final static String[] holiday = {"Chaoflux", "Discoflux", "Confuflux",
"Bureflux", "Afflux"};

public static String discordianDate(final GregorianCalendar date) {
int y = date.get(Calendar.YEAR);
int yold = y + 1166;
int dayOfYear = date.get(Calendar.DAY_OF_YEAR);

if (date.isLeapYear(y)) {
if (dayOfYear == 60)
return "St. Tib's Day, in the YOLD " + yold;
else if (dayOfYear > 60)
dayOfYear--;
}

dayOfYear--;

int seasonDay = dayOfYear % 73 + 1;
if (seasonDay == 5)
return apostle[dayOfYear / 73] + ", in the YOLD " + yold;
if (seasonDay == 50)
return holiday[dayOfYear / 73] + ", in the YOLD " + yold;

String season = seasons[dayOfYear / 73];
String dayOfWeek = weekday[dayOfYear % 5];

return String.format("%s, day %s of %s in the YOLD %s",
dayOfWeek, seasonDay, season, yold);
}

public static void main(String[] args) {

System.out.println(discordianDate(new GregorianCalendar()));

test(2010, 6, 22, "Pungenday, day 57 of Confusion in the YOLD 3176");
test(2012, 1, 28, "Prickle-Prickle, day 59 of Chaos in the YOLD 3178");
test(2012, 1, 29, "St. Tib's Day, in the YOLD 3178");
test(2012, 2, 1, "Setting Orange, day 60 of Chaos in the YOLD 3178");
test(2010, 0, 5, "Mungday, in the YOLD 3176");
test(2011, 4, 3, "Discoflux, in the YOLD 3177");
test(2015, 9, 19, "Boomtime, day 73 of Bureaucracy in the YOLD 3181");
}

private static void test(int y, int m, int d, final String result) {
assert (discordianDate(new GregorianCalendar(y, m, d)).equals(result));
}
}
```
Output:
`Setting Orange, day 4 of Confusion in the YOLD 3180`

## JavaScript

```/**
* All Hail Discordia! - this script prints Discordian date using system date.
*
* lang: JavaScript
* author: jklu
* contributors: JamesMcGuigan
*
* changelog:
* - Modified to return same output syntax as unix ddate + module.exports - James McGuigan, 2/Chaos/3183
*
* source: https://rosettacode.org/wiki/Discordian_date#JavaScript
*/
var seasons = [
"Chaos", "Discord", "Confusion",
"Bureaucracy", "The Aftermath"
];
var weekday = [
"Sweetmorn", "Boomtime", "Pungenday",
"Prickle-Prickle", "Setting Orange"
];

var apostle = [
];

var holiday = [
"Chaoflux", "Discoflux", "Confuflux",
"Bureflux", "Afflux"
];

Date.prototype.isLeapYear = function() {
var year = this.getFullYear();
if( (year & 3) !== 0 ) { return false; }
return ((year % 100) !== 0 || (year % 400) === 0);
};

// Get Day of Year
Date.prototype.getDOY = function() {
var dayCount  = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
var mn        = this.getMonth();
var dn        = this.getDate();
var dayOfYear = dayCount[mn] + dn;
if( mn > 1 && this.isLeapYear() ) { dayOfYear++; }
return dayOfYear;
};

Date.prototype.isToday = function() {
var today = new Date();
return this.getDate()     === today.getDate()
&& this.getMonth()    === today.getMonth()
&& this.getFullYear() === today.getFullYear()
;
};

function discordianDate(date) {
if( !date ) { date = new Date(); }

var y                = date.getFullYear();
var yold             = y + 1166;
var dayOfYear        = date.getDOY();
var celebrateHoliday = null;

if( date.isLeapYear() ) {
if( dayOfYear == 60 ) {
celebrateHoliday = "St. Tib's Day";
}
else if( dayOfYear > 60 ) {
dayOfYear--;
}
}
dayOfYear--;

var divDay = Math.floor(dayOfYear / 73);

var seasonDay = (dayOfYear % 73) + 1;
if( seasonDay == 5 ) {
celebrateHoliday = apostle[divDay];
}
if( seasonDay == 50 ) {
celebrateHoliday = holiday[divDay];
}

var season    = seasons[divDay];
var dayOfWeek = weekday[dayOfYear % 5];

var nth = (seasonDay % 10 == 1) ? 'st'
: (seasonDay % 10 == 2) ? 'nd'
: (seasonDay % 10 == 3) ? 'rd'
: 'th';

return "" //(date.isToday() ? "Today is " : '')
+ dayOfWeek
+ ", the " + seasonDay + nth
+ " day of " + season
+ " in the YOLD " + yold
+ (celebrateHoliday ? ". Celebrate " + celebrateHoliday + "!" : '')
;
}

function test(y, m, d, result) {
console.assert((discordianDate(new Date(y, m, d)) == result), [y, m, d, discordianDate(new Date(y, m, d)), result]);
}

// Only run test code if node calls this file directly
if( require.main === module ) {
console.log(discordianDate(new Date(Date.now())));
test(2010, 6, 22, "Pungenday, the 57th day of Confusion in the YOLD 3176");
test(2012, 1, 28, "Prickle-Prickle, the 59th day of Chaos in the YOLD 3178");
test(2012, 1, 29, "Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib's Day!");
test(2012, 2,  1, "Setting Orange, the 60th day of Chaos in the YOLD 3178");
test(2010, 0,  5, "Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!");
test(2011, 4,  3, "Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!");
test(2015, 9, 19, "Boomtime, the 73rd day of Bureaucracy in the YOLD 3181");
}

module.exports = discordianDate;
```

Example use:

```console.log(discordianDate(new Date(Date.now())));
"Boomtime, the 2nd day of Chaos in the YOLD 3183"
```

look at calendar; learn about holydays

## JotaCode

```@print(
"Today is ",
0,-1,
1,30,
2,58,
3,89,
4,119,
5,150,
6,180,
7,211,
8,242,
9,272,
10,303,
11,333)
,@time("mday")),@switch(@print(@time("mon"),"/",@time("mday")),
"1/29","St. Tib's Day",
@print(@switch(@mod("%1",5),
0,"Sweetmorn",
1,"Boomtime",
2,"Pungenday",
3,"Prickle-Prickle",
4,"Setting Orange"),
", ",
@switch(@idiv("%1",73),
0,"Chaos",
1,"Discord",
2,"Confusion",
3,"Bureaucracy",
4,"The Aftermath"),
" ",
", YOLD ",
)),".")```

## jq

Works with: jq

Also works with gojq, the Go implementation of jq

Also works with fq, a Go implementation of a large subset of jq

```### Gregorian calendar
def isLeapYear(y):
y%4 == 0 and ((y%100 != 0) or (y%400 == 0));

### Discordian calendar
def seasons:  ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"];

def weekdays: ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"];

def holidays: ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"];

# Input: {year, dayOfYear}
def discordian(date):
date.year as \$y
| " in the YOLD \(\$y + 1166)." as \$yold
| { doy: date.dayOfYear, holyday: ""}
| if isLeapYear(\$y) and (.doy == 60) then "St. Tib's Day" + \$yold
else if isLeapYear(\$y) and (.doy > 60) then .doy += -1 else . end
| .doy += -1
| .seasonDay = ((.doy % 73) + 1)
| .seasonNr = ((.doy/73)|floor)
| .weekdayNr = .doy % 5
| if .seasonDay == 5 then .holyday = " Celebrate \(apostles[.seasonNr])!"
elif .seasonDay == 50 then .holyday = " Celebrate \(holidays[.seasonNr])!"
else .
end
| .season = seasons[.seasonNr]
| .dow = weekdays[.weekdayNr]
| "\(.dow), day \(.seasonDay) of \(.season)\(\$yold)\(.holyday)"
end ;

def dates: [
"2010-01-01",
"2010-01-05",
"2011-02-19",
"2012-02-28",
"2012-02-29",
"2012-03-01",
"2013-03-19",
"2014-05-03",
"2015-05-31",
"2016-06-22",
"2016-07-15",
"2017-08-12",
"2018-09-19",
"2018-09-26",
"2019-10-24",
"2020-12-08",
"2020-12-31"
];

dates[]
| (strptime("%Y-%m-%d")
| {year: .[0], dayOfYear: (1 + .[-1])}) as \$dt
| "\(.) = \(discordian(\$dt))"```
Output:

As for Wren.

## Julia

```using Dates

function discordiandate(year::Integer, month::Integer, day::Integer)
discordianseasons = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"]
holidays = Dict(
"Chaos 5" => "Mungday",
"Chaos 50" => "Chaoflux",
"Discord 5" => "Mojoday",
"Discord 50" => "Discoflux",
"Confusion 50" => "Confuflux",
"Bureaucracy 50" => "Bureflux",
"The Aftermath 50" => "Afflux")
today = Date(year, month, day)
isleap = isleapyear(year)
if isleap && month == 2 && day == 29
rst = "St. Tib's Day, YOLD " * string(year + 1166)
else
dy = dayofyear(today)
if isleap && dy >= 60
dy -= 1
end
rst = string(discordianseasons[div(dy, 73) + 1], " ", rem(dy, 73)) # day
rst *= " (\$(holidays[rst]))" # if holiday
end
rst *= ", YOLD \$(year + 1166)" # year
end
return rst
end

@show discordiandate(2017, 08, 15)
@show discordiandate(1996, 02, 29)
@show discordiandate(1996, 02, 19)
```
Output:
```discordiandate(2017, 8, 15) = "Bureaucracy 8, YOLD 3183"
discordiandate(1996, 2, 29) = "St. Tib's Day, YOLD 3162"
discordiandate(1996, 2, 19) = "Chaos 50 (Chaoflux), YOLD 3162"```

## Kotlin

Translation of: Java
```import java.util.Calendar
import java.util.GregorianCalendar

enum class Season {
Chaos, Discord, Confusion, Bureaucracy, Aftermath;
companion object { fun from(i: Int) = values()[i / 73] }
}
enum class Weekday {
Sweetmorn, Boomtime, Pungenday, Prickle_Prickle, Setting_Orange;
companion object { fun from(i: Int) = values()[i % 5] }
}
enum class Apostle {
companion object { fun from(i: Int) = values()[i / 73] }
}
enum class Holiday {
Chaoflux, Discoflux, Confuflux, Bureflux, Afflux;
companion object { fun from(i: Int) = values()[i / 73] }
}

fun GregorianCalendar.discordianDate(): String {
val y = get(Calendar.YEAR)
val yold = y + 1166

var dayOfYear = get(Calendar.DAY_OF_YEAR)
if (isLeapYear(y)) {
if (dayOfYear == 60)
return "St. Tib's Day, in the YOLD " + yold
else if (dayOfYear > 60)
dayOfYear--
}

val seasonDay = --dayOfYear % 73 + 1
return when (seasonDay) {
5 -> "" + Apostle.from(dayOfYear) + ", in the YOLD " + yold
50 -> "" + Holiday.from(dayOfYear) + ", in the YOLD " + yold
else -> "" + Weekday.from(dayOfYear) + ", day " + seasonDay + " of " + Season.from(dayOfYear) + " in the YOLD " + yold
}
}

internal fun test(y: Int, m: Int, d: Int, result: String) {
assert(GregorianCalendar(y, m, d).discordianDate() == result)
}

fun main(args: Array<String>) {
println(GregorianCalendar().discordianDate())

test(2010, 6, 22, "Pungenday, day 57 of Confusion in the YOLD 3176")
test(2012, 1, 28, "Prickle-Prickle, day 59 of Chaos in the YOLD 3178")
test(2012, 1, 29, "St. Tib's Day, in the YOLD 3178")
test(2012, 2, 1, "Setting Orange, day 60 of Chaos in the YOLD 3178")
test(2010, 0, 5, "Mungday, in the YOLD 3176")
test(2011, 4, 3, "Discoflux, in the YOLD 3177")
test(2015, 9, 19, "Boomtime, day 73 of Bureaucracy in the YOLD 3181")
}
```

```          R   DISCORDIAN DATE CALCULATION
R
R   PUNCH CARD SHOULD CONTAIN -
R   MM/DD/YYYY
R   IN GREGORIAN CALENDAR

NORMAL MODE IS INTEGER

VECTOR VALUES MLENGT =
0   0,0,31,59,90,120,151,181,212,243,273,304,334
VECTOR VALUES TIBS =
0   \$31HSAINT TIBS DAY IN THE Y.O.L.D. ,I4*\$
VECTOR VALUES DISDAT =
0   \$C,6H, DAY ,I2,S1,3HOF ,C,S1,16HIN THE Y.O.L.D. ,I4*\$

VECTOR VALUES DISDAY = \$SWEETMORN\$, \$BOOMTIME\$,
0   \$PUNGENDAY\$, \$PRICKLE-PRICKLE\$, \$SETTING ORANGE\$
VECTOR VALUES DISSSN = \$CHAOS\$, \$DISCORD\$,
0   \$CONFUSION\$, \$BUREAUCRACY\$, \$THE AFTERMATH\$

VECTOR VALUES CLDAY  = \$10HCELEBRATE ,C,3HDAY*\$
VECTOR VALUES CLFLUX = \$10HCELEBRATE ,C,4HFLUX*\$
VECTOR VALUES HOLY5  = \$MUNG\$,\$MOJO\$,\$SYA\$,\$ZARA\$,\$MALA\$
VECTOR VALUES HOLY50 = \$CHAO\$,\$DISCO\$,\$CONFU\$,\$BURE\$,\$AF\$

VECTOR VALUES GREG = \$2(I2,1H/),I4*\$

WHENEVER GMONTH.E.2 .AND. GDAY.E.29
PRINT FORMAT TIBS, GYEAR + 1166
OTHERWISE
YRDAY = MLENGT(GMONTH)+GDAY
SEASON = YRDAY/73
DAY = YRDAY-SEASON*73
WKDAY = (YRDAY-1)-(YRDAY-1)/5*5
PRINT FORMAT DISDAT, DISDAY(WKDAY), DAY,
0         DISSSN(SEASON), GYEAR + 1166
WHENEVER DAY.E.5
PRINT FORMAT CLDAY, HOLY5(SEASON)
OR WHENEVER DAY.E.50
PRINT FORMAT CLFLUX, HOLY50(SEASON)
END OF CONDITIONAL
END OF CONDITIONAL
END OF PROGRAM```
Output:
```01/05/2005
SETTING ORANGE, DAY  5 OF CHAOS IN THE Y.O.L.D. 3171
CELEBRATE MUNGDAY

09/26/1995
PRICKLE-PRICKLE, DAY 50 OF BUREAUCRACY IN THE Y.O.L.D. 3161
CELEBRATE BUREFLUX

02/29/1996
SAINT TIBS DAY IN THE Y.O.L.D. 3162

12/05/2020
PRICKLE-PRICKLE, DAY 47 OF THE AFTERMATH IN THE Y.O.L.D. 3186```

## Maple

```convertDiscordian := proc(year, month, day)
local days31, days30, daysThisYear, i, dYear, dMonth, dDay, seasons, week, dayOfWeek;
days31 := [1, 3, 5, 7, 8, 10, 12];
days30 := [4, 6, 9, 11];
if month < 1 or month >12 then
error "Invalid month: %1", month;
end if;
if (member(month, days31) and day > 31) or (member(month, days30) and day > 30) or (month = 2 and day > 29) or day < 1 then
error "Invalid date: %1", day;
end if;
dYear := year + 1166;
if month = 2 and day = 29 then
printf("The date is St. Tib's Day, YOLD %a.\n", dYear);
else
seasons := ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"];
week := ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"];
daysThisYear := 0;
for i to month-1 do
if member(i, days31) then
daysThisYear := daysThisYear + 31;
elif member(i, days30) then
daysThisYear := daysThisYear + 30;
else
daysThisYear := daysThisYear + 28;
end if;
end do;
daysThisYear := daysThisYear + day -1;
dMonth := seasons[trunc((daysThisYear) / 73)+1];
dDay := daysThisYear mod 73 +1;
dayOfWeek := week[daysThisYear mod 5 +1];
printf("The date is %s %s %s, YOLD %a.\n", dayOfWeek, dMonth, convert(dDay, ordinal), dYear);
end if;
end proc:

convertDiscordian (2016, 1, 1);
convertDiscordian (2016, 2, 29);
convertDiscordian (2016, 12, 31);```
Output:
```The date is Sweetmorn Chaos first, YOLD 3182.
The date is St. Tib's Day, YOLD 3182.
The date is Setting Orange The Aftermath 73rd, YOLD 3182.
```

## Mathematica / Wolfram Language

```DiscordianDate[y_, m_, d_] := Module[{year = ToString[y + 1166], month = m, day = d},

DMONTHS = {"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"};
DDAYS = {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"};
DayOfYear = DateDifference[{y} ,{y, m, d}] + 1;
LeapYearQ = (Mod[#, 4]== 0 && (Mod[#, 100] != 0 || Mod[#, 400] == 0))&@ y;

If [ LeapYearQ && month == 2 && day == 29,
Print["Today is St. Tib's Day, YOLD ", ]
,
If [ LeapYearQ && DayOfYear >= 60, DayOfYear -= 1 ];
{season, dday} = {Quotient[DayOfYear, 73], Mod[DayOfYear, 73]};
Print["Today is ", DDAYS[[Mod[dday,4] + 1]],", ",DMONTHS[[season+1]]," ",dday,", YOLD ",year]
];
]
```
Output:
```DiscordianDate[2012,2,28]
-> Today is Prickle-Prickle, Chaos 59, YOLD 3178

DiscordianDate[2012,2,29]
-> Today is St. Tib's Day, YOLD 3178

DiscordianDate[2012,3,1]
-> Today is Setting Orange, Chaos 60, YOLD 3178```

## Nim

We use a DateTime object as intermediate representation.

```import times, strformat

const

DiscordianOrigin = -1166
SaintTibsDay = "St. Tib’s Day"

type

Season = enum
sCha = (1, "Chaos"), sDis = "Discord", sCon = "Confusion",
sBur = "Bureaucracy", sAft = "The Aftermath"

ErisianWeekDay = enum
eSwe = "Sweetmorn", eBoo = "Boomtime", ePun = "Pungenday",
ePri = "Prickle-Prickle", eSet = "Setting Orange"

SeasonDayRange = range[1..73]

# Description of a discordian date.
DiscordianDate = object
year: int
yearday: YeardayRange
case isSaintTibsDay: bool
of false:
seasondayZero: int
seasonZero: int
weekday: ErisianWeekDay
else:
nil

#---------------------------------------------------------------------------------------------------

proc toDiscordianDate(gdate: DateTime): DiscordianDate =
## Convert a DateTime to a discordian date.
## All the time fields are ignored.

# Create the object.
result = DiscordianDate(isSaintTibsDay: gdate.isLeapDay)

# The yearday field is unchanged.
result.yearday = gdate.yearday

# The year is simply translated.
result.year = gdate.year - DiscordianOrigin

# For remaining fields, we must take in account leap years.
if not result.isSaintTibsDay:
var yearday = result.yearday
if gdate.year.isLeapYear and result.yearday > 59:
dec yearday
# Now, we have simply to use division and modulo using the corrected yearday.
result.seasonZero = yearday div SeasonDayRange.high
result.seasondayZero = yearday mod SeasonDayRange.high
result.weekday = ErisianWeekDay(yearday mod 5)

#---------------------------------------------------------------------------------------------------

proc `\$`(date: DiscordianDate): string =
## Convert a discordian date to a string.
if date.isSaintTibsDay:
result = SaintTibsDay
else:
result = fmt"{date.weekday}, {Season(date.seasonZero + 1)} {date.seasondayZero + 1}"
result &= fmt", {date.year} YOLD"

#---------------------------------------------------------------------------------------------------

proc showDiscordianDate(year, month, day: Natural) =
## Show the discordian date corresponding to a gregorian date.
let gdate = initDateTime(year = year, month = Month(month), monthday = day,
hour = 0, minute = 0, second = 0)
echo gdate.format("YYYY-MM-dd"), ": ", \$gdate.toDiscordianDate()

#———————————————————————————————————————————————————————————————————————————————————————————————————

showDiscordianDate(2100, 12, 31)
showDiscordianDate(2012, 02, 28)
showDiscordianDate(2012, 02, 29)
showDiscordianDate(2012, 03, 01)
showDiscordianDate(2010, 07, 22)
showDiscordianDate(2012, 09, 02)
showDiscordianDate(2012, 12, 31)
```
Output:
```2100-12-31: Setting Orange, The Aftermath 73, 3266 YOLD
2012-02-28: Prickle-Prickle, Chaos 59, 3178 YOLD
2012-02-29: St. Tib’s Day, 3178 YOLD
2012-03-01: Setting Orange, Chaos 60, 3178 YOLD
2010-07-22: Pungenday, Confusion 57, 3176 YOLD
2012-09-02: Setting Orange, Bureaucracy 26, 3178 YOLD
2012-12-31: Setting Orange, The Aftermath 73, 3178 YOLD```

## Pascal

```program ddate;
{
This program is free software, it's done it's time
and paid for it's crime. You can copy, edit and use this
software under the terms of the GNU GPL v3 or later.

On this day Boomtime, the 71st day of Confusion in the YOLD 3183

This program will print out the current date in Erisian format as specified in

P R I N C I P I A   D I S C O R D I A

If you run it with a date it the command line in european format (dd mm yy) it
will print the equvolent Discordian date. If you omit the year and  month the
current Anerisiean month and year as assumed.

POPE Englebert Finklestien.
}
uses Sysutils;

var
YY,MM,DD : word;
YOLD : Boolean;
Hedgehog: integer;
Eris: string;
snub: string;
chaotica: string;
midget: string;
bob: string;

Anerisiandaysinmonth: array[1..12] of integer = (31,28,31,30,31,30,31,31,30,31,30,31);

procedure anerisiandate;
{ tHIS JUST GETS THE DATE INTO THE  DD,MM,YY VARIABLES }
begin
DeCodeDate(date,yy,mm,dd);
end;

procedure BORIS;
{ This just tests to see if we are in a leap year }
var
snafu : boolean;
begin
snafu := False;
if (yy mod 4 = 0) then snafu := True;
if ((yy mod 100 = 0) and (yy mod 400 <> 0)) then snafu := False;
if ((snafu) and (mm = 2 ) and (dd=29)) then YOLD := True;
end;

function hodgepodge: integer;
{ This returns the total number of days since the year began.
It doesn't bother with leap years at all.
I get a wierd optical illusion looking at the until in this }
var
fnord : integer;
begin
Hedgehog := 1;
hodgepodge := 0;
fnord :=0;
if (mm > 1) then repeat
fnord := fnord + Anerisiandaysinmonth[Hedgehog];
Hedgehog := Hedgehog +1;
until Hedgehog = mm;
fnord := fnord + dd;
hodgepodge := fnord;
end;

function treesaregreen(): string;
{Returns the YOLD as a string}

begin
treesaregreen := IntTOStr(yy+1166);
end;

procedure GRAYFACE;
{This calculates everything, but does not bother much about leap years}
var
wrestle: integer;
Thwack: string;
begin
Hedgehog := hodgepodge;
wrestle := 0;
Thwack := 'th';
{set bob to the name of the holyday or St. Tibs day }
bob := 'St. Tibs Day';
if (Hedgehog = 5 )  then bob := 'Mungday';
if (Hedgehog = 50 ) then bob := 'Chaoflux';
if (Hedgehog = 78 ) then bob := 'Mojoday';
if (Hedgehog = 123) then bob := 'Discoflux';
if (Hedgehog = 151) then bob := 'Syaday';
if (Hedgehog = 196) then bob := 'Confuflux';
if (Hedgehog = 224) then bob := 'Zaraday';
if (Hedgehog = 269) then bob := 'Bureflux';
if (Hedgehog = 297) then bob := 'Maladay';
if (Hedgehog = 342) then bob := 'Afflux';
{Not doing things the usual way
Lets find the week day and count the number of
5 day weeks all at the same time}
while (Hedgehog > 5) do begin
Hedgehog := Hedgehog -5;
wrestle := Wrestle + 1;
end;
if (Hedgehog = 1) then snub := 'Sweetmorn'  ;
if (Hedgehog = 2) then snub := 'BoomTime';
if (Hedgehog = 3) then snub := 'Pungenday';
if (Hedgehog = 4) then snub := 'Prickle-Prickle';
if (Hedgehog = 5) then snub := 'Setting Orange';
{Now to set the Season name}
chaotica:='The Aftermath';
if (wrestle <=57) then chaotica := 'Bureaucracy';
if ((wrestle = 58) and (Hedgehog < 3)) then chaotica := 'Bureaucracy';
if (wrestle <= 42) then chaotica := 'Confusion';
if ((wrestle = 43) and (Hedgehog < 5)) then chaotica := 'Confusion';
if (wrestle <=28) then chaotica := 'Discord';
if ((wrestle = 29) and (Hedgehog < 2)) then chaotica := 'Discord';
if (wrestle <=13) then chaotica := 'Chaos';
if ((wrestle = 14) and (Hedgehog < 4)) then chaotica := 'Chaos';

{Now all we need the day of the season}
wrestle := (wrestle*5)+Hedgehog;
while (wrestle >73) do wrestle := wrestle -73;
{pick the appropriate day postfix, allready set to th}
if (wrestle in [1,21,31,41,51,61,71]) then Thwack:='st';
if (wrestle in [2,22,32,42,52,62,72]) then Thwack:='nd';
if (wrestle in [3,23,33,43,53,63,73]) then Thwack:='rd';
{Check to see if it is a holy day, if so bob will have
the right holyday name already, including St Tibs Day}
if (wrestle in [5,50]) then YOLD := True;
{I love this line of code}
midget := IntToStr(wrestle) + Thwack;
end;

{The main program starts here}
begin
anerisiandate;
if (ParamCount >=1) then dd := StrTOInt(ParamStr(1));
if (ParamCount >=2) then mm := StrToInt(ParamStr(2));
if (ParamCount =3) then yy := StrToInt(ParamStr(3));
BORIS;
GRAYFACE;
{ The only thing to bother about is holy days and St Tibs day }
Eris := 'Today is: ' + snub +' the ' + midget +' day of the season of ' + chaotica;
if (YOLD) then begin
Eris := 'Celebrate for today, ' + snub + ' the ' + midget + ' day of ' +chaotica + ' is the holy day of ' + bob;
end;
{The only place we deal with St. Tibs Day}
if ((YOLD) and ((mm=2) and (dd=29))) then Eris := 'Celebrate ' + bob + ' Chaos';
{This next line applies to all possibilities}
Eris := Eris + ' YOLD ' + treesaregreen;
WriteLn(Eris);
end.
```
Output:
```
./ddate
Today is: Setting Orange the 1st day of the season of The Aftermath YOLD 3183
./ddate 12
Celebrate for today, Prickle-Prickle the 5th day of The Aftermath is the holy day of Zaraday YOLD 3183
./ddate 13 5
Today is: Pungenday the 60th day of the season of Confusion YOLD 3183
./ddate 29 2 2020
Celebrate St. Tibs Day Chaos YOLD 3186
```

## Perl

Translation of: Raku
```use 5.010;
use strict;
use warnings;
use Time::Piece ();

my @seasons = (qw< Chaos Discord Confusion Bureaucracy >, 'The Aftermath');
my @week_days = (qw< Sweetmorn Boomtime Pungenday Prickle-Prickle >, 'Setting Orange');

sub ordinal {
my (\$n) = @_;
return \$n . "th" if int(\$n/10) == 1;
return \$n . ((qw< th st nd rd th th th th th th>)[\$n % 10]);
}

sub ddate {
my \$d = Time::Piece->strptime( \$_[0], '%Y-%m-%d' );
my \$yold = 'in the YOLD ' . (\$d->year + 1166);

my \$day_of_year0 = \$d->day_of_year;

if( \$d->is_leap_year ) {
return "St. Tib's Day, \$yold" if \$d->mon == 2 and \$d->mday == 29;
\$day_of_year0-- if \$day_of_year0 >= 60; # Compensate for St. Tib's Day
}

my \$weekday = \$week_days[ \$day_of_year0 % @week_days ];
my \$season = \$seasons[ \$day_of_year0 / 73 ];
my \$season_day = ordinal( \$day_of_year0 % 73 + 1 );

return "\$weekday, the \$season_day day of \$season \$yold";
}

say "\$_ is " . ddate(\$_) for qw< 2010-07-22 2012-02-28 2012-02-29 2012-03-01 >;
```
Output:
```2010-07-22 is Pungenday, the 57th day of Confusion in the YOLD 3176
2012-02-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3178
2012-02-29 is St. Tib's Day, in the YOLD 3178
2012-03-01 is Setting Orange, the 60th day of Chaos in the YOLD 3178
```

## Phix

```with javascript_semantics
constant seasons = {"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"},
weekday = {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"},
holiday = {"Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"}

function discordianDate(sequence dt)
integer {y,m,d} = dt,
leap = is_leap_year(y),
doy = day_of_year(y,m,d)-1
string dyear = sprintf("%d",y+1166)
if leap and m=2 and d=29 then
return "St. Tib's Day, in the YOLD " & dyear
end if
if leap and doy>=60 then
doy -= 1
end if
integer dsday = remainder(doy,73)+1,
dseason = floor(doy/73+1)
if dsday=5 then
return apostle[dseason] & ", in the YOLD " & dyear
elsif dsday=50 then
return holiday[dseason] & ", in the YOLD " & dyear
end if
string dseas = seasons[dseason],
dwday = weekday[remainder(doy,5)+1]
return sprintf("%s, day %d of %s in the YOLD %s", {dwday, dsday, dseas, dyear})
end function

-- test code

sequence dt = {2015,1,1,0,0,0,0,0}
include timedate.e
atom oneday = timedelta(days:=1)
set_timedate_formats({"DD/MM/YYYY"})
for i=1 to 5 do
printf(1,"%s: %s\n",{format_timedate(dt),discordianDate(dt)})
printf(1,"%s: %s\n",{format_timedate(dt),discordianDate(dt)})
end for
```
Output:
```"01/01/2015: Sweetmorn, day 1 of Chaos in the YOLD 3181"
"14/03/2015: Pungenday, day 73 of Chaos in the YOLD 3181"
"15/03/2015: Prickle-Prickle, day 1 of Discord in the YOLD 3181"
"26/05/2015: Sweetmorn, day 73 of Discord in the YOLD 3181"
"27/05/2015: Boomtime, day 1 of Confusion in the YOLD 3181"
"07/08/2015: Prickle-Prickle, day 73 of Confusion in the YOLD 3181"
"08/08/2015: Setting Orange, day 1 of Bureaucracy in the YOLD 3181"
"19/10/2015: Boomtime, day 73 of Bureaucracy in the YOLD 3181"
"20/10/2015: Pungenday, day 1 of The Aftermath in the YOLD 3181"
"31/12/2015: Setting Orange, day 73 of The Aftermath in the YOLD 3181"
```

## PHP

```<?php
\$Anerisia = array(31,28,31,30,31,30,31,31,30,31,30,31);
\$MONTHS = array("Choas","Discord","Confusion","Bureacracy","The Aftermath");
\$DAYS = array("Setting Orange","Sweetmorn","BoomTime","Pungenday","Prickle-Prickle");
\$Dsuff = array('th','st','nd','rd','th','th','th','th','th','th');
\$Holy50 = array("Chaoflux","Discoflux","Confuflux","Bureflux","Afflux");

// Get the current system date and assign to some variables
\$edate = explode(" ",date('Y m j L'));
\$usery = \$edate[0];
\$userm = \$edate[1];
\$userd = \$edate[2];
\$IsLeap = \$edate[3];

// If the user supplied us with a date overide the one we got from the system.
// If you could get the date from users browser via javascript and then call
// this script with the users date. ddate.php?y=year&m=month&d=day mostly it
// won't matter but if the server is in a different time zone to the user
// There will be occasional incorrect results from the users POV.

if (isset(\$_GET['y']) && isset(\$_GET['m']) && isset(\$_GET['d'])) {
\$usery = \$_GET['y'];
\$userm = \$_GET['m'];
\$userd = \$_GET['d'];
\$IsLeap = 0;
if ((\$usery%4 == 0) && (\$usery%100 >0)) \$IsLeap =1;
if (\$usery%400 == 0) \$IsLeap = 1;
}

// We need to know the total number of days in the year so far

\$userdays = 0;
\$i = 0;
while (\$i < (\$userm-1)) {

\$userdays = \$userdays + \$Anerisia[\$i];
\$i = \$i +1;
}
\$userdays = \$userdays + \$userd;

// We can now work out the full discordian date for most dates
// PHP does not do integer division, so we use 73.2 as a divisor
// the value 73.2 works, larger values cause an off-by-one on season
// changes for the later seasons .
// This is not needed with the mod operator.

\$IsHolyday = 0;
\$dyear = \$usery + 1166;
\$dmonth = \$MONTHS[\$userdays/73.2];
\$dday = \$userdays%73;
if (0 == \$dday) \$dday = 73;
\$Dname = \$DAYS[\$userdays%5];
\$Holyday = "St. Tibs Day";
if (\$dday == 5) {
\$Holyday = \$Holy5[\$userdays/73.2];
\$IsHolyday =1;
}
if (\$dday == 50) {
\$Holyday = \$Holy50[\$userdays/73.2];
\$IsHolyday =1;
}

if ((\$IsLeap ==1) && (\$userd ==29) and (\$userm ==2)) \$IsHolyday = 2;

// work out the suffix to the day number
\$suff = \$Dsuff[\$dday%10] ;
if ((11 <= \$dday) && (19 >= \$dday)) \$suff='th';

// code to display the date ...

if (\$IsHolyday ==2)
echo "</br>Celeberate ",\$Holyday," ",\$dmonth," YOLD ",\$dyear;
if (\$IsHolyday ==1)
echo "</br>Celeberate for today ", \$Dname , " The ", \$dday,"<sup>",\$suff,"</sup>", " day of ", \$dmonth , " YOLD " , \$dyear , " is the holy day of " , \$Holyday;
if (\$IsHolyday == 0)
echo "</br>Today is " , \$Dname , " the " , \$dday ,"<sup>",\$suff, "</sup> day of " , \$dmonth , " YOLD " , \$dyear;

?>
```
Output:
```ddate.php #23 November 2011
Today is Boomtime the 35th day of The Aftermath YOLD 3177

ddate.php?y=2012&m=2&y=28
Today is Prickle-Prickle the 59th day of Chaos YOLD 3178

ddate.php?y=2012&m=2&y=29
Celeberate St. Tibs Day, Chaos YOLD 3178

ddate.php?y=2017&m=8&d=12
Celeberate for today Prickle-Prickle The 5th day of Bureacracy YOLD 3183 is the holy day of Zaraday
```

## PicoLisp

Translation of: Python
```(de disdate (Year Month Day)
(let? Date (date Year Month Day)
(let (Leap (date Year 2 29)  D (- Date (date Year 1 1)))
(if (and Leap (= 2 Month) (= 29 Day))
(pack "St. Tib's Day, YOLD " (+ Year 1166))
(and Leap (>= D 60) (dec 'D))
(pack
(get
'("Chaos" "Discord" "Confusion" "Bureaucracy" "The Aftermath")
(inc (/ D 73)) )
" "
(inc (% D 73))
", YOLD "
(+ Year 1166) ) ) ) ) )```

## Pike

Pike includes a Discordian calendar. dates can be converted from any calendar to any other.

```> Calendar.Discordian.now()->format_ext_ymd();
Result: "Pungenday, 59 Bureaucracy 3177"
> Calendar.Discordian.Day(Calendar.Day(2011,11,11))->format_ext_ymd();
Result: "Setting Orange, 23 The Aftermath 3177"
Result: "Setting Orange, 23 The Aftermath 3177"
> Calendar.Day((Calendar.Discordian.Month()+1)->day(1));
Result: Day(Thu 20 Oct 2011)
```

## PL/M

Works with: 8080 PL/M Compiler

... under CP/M (or an emulator)
Based on:

...via Algol W

```100H: /* DISCORDIAN DATE CALCULATION - TRANSLATION OF MAD (VIA ALGOL W)     */

/* CP/M SYSTEM CALL AND I/O ROUTINES                                     */
BDOS:      PROCEDURE( FN, ARG ); DECLARE FN BYTE, ARG ADDRESS; GOTO 5; END;
PR\$CHAR:   PROCEDURE( C ); DECLARE C BYTE;    CALL BDOS( 2, C );  END;
PR\$STRING: PROCEDURE( S ); DECLARE S ADDRESS; CALL BDOS( 9, S );  END;
PR\$NL:     PROCEDURE;   CALL PR\$CHAR( 0DH ); CALL PR\$CHAR( 0AH ); END;
PR\$NUMBER: PROCEDURE( N ); /* PRINTS A NUMBER IN THE MINIMUN FIELD WIDTH */
DECLARE V ADDRESS, N\$STR ( 6 )BYTE, W BYTE;
V = N;
W = LAST( N\$STR );
N\$STR( W ) = '\$';
N\$STR( W := W - 1 ) = '0' + ( V MOD 10 );
DO WHILE( ( V := V / 10 ) > 0 );
N\$STR( W := W - 1 ) = '0' + ( V MOD 10 );
END;
CALL PR\$STRING( .N\$STR( W ) );
END PR\$NUMBER;

/* COMMAND LINE                                                          */
DECLARE CL\$PTR  ADDRESS;     /* POINTER TO THE CURRENT COMMAND LINE CHAR */
DECLARE CL\$CHAR BASED CL\$PTR BYTE;     /* CURRENT COMMAND LINE CHARACTER */
DECLARE CL\$LEN  ADDRESS;                   /* LENGTH OF THE COMMAND LINE */

/* INITIALISES THE COMMAND LINE VARIABLES                                */
CL\$INIT: PROCEDURE;
CL\$LEN = CL\$CHAR;
CL\$PTR = CL\$PTR + 1;
END CL\$INIT;

/* READS A NUMBER FROM THE COMMAND LINE, THE TERMINATOR IS IGNORED       */
N = 0;
DO WHILE CL\$PTR  <= ( CL\$ADDR + CL\$LEN ) AND CL\$CHAR = ' ';
CL\$PTR = CL\$PTR + 1;
END;
DO WHILE CL\$PTR  <= ( CL\$ADDR + CL\$LEN ) AND CL\$CHAR >= '0'
AND CL\$CHAR <= '9';
N      = ( N * 10 ) + ( CL\$CHAR - '0' );
CL\$PTR = CL\$PTR + 1;
END;
CL\$PTR = CL\$PTR + 1; /* SKIP THE CHARACTER THAT TERMINATED THE NUMBER */
RETURN N;
END CL\$NUMBER;

INITIAL(   0,   0,  31,  59,  90, 120
, 151, 181, 212, 243, 273, 304, 334
);

HOLY5 (0) = .'MUNG\$'; HOLY5 (1) = .'MOJO\$'; HOLY5 (2) = .'SYA\$';
HOLY5 (3) = .'ZARA\$'; HOLY5 (4) = .'MALA\$';
HOLY50(0) = .'CHAO\$'; HOLY50(1) = .'DISCO\$'; HOLY50(2) = .'CONFU\$';
HOLY50(3) = .'BURE\$'; HOLY50(4) = .'AF\$';
DISDAY(0) = .'SWEETMORN\$'; DISDAY(1) = .'BOOMTIME\$';
DISDAY(2) = .'PUNGENDAY\$'; DISDAY(3) = .'PRICKLE-PRICKLE\$';
DISDAY(4) = .'SETTING ORANGE\$';
DISSSN(0) = .'CHAOS\$'; DISSSN(1) = .'DISCORD\$'; DISSSN(2) = .'CONFUSION\$';
DISSSN(3) = .'BUREAUCRACY\$'; DISSSN(4) = .'THE AFTERMATH\$';

/* GET THE GREGORIAN DATE FROM THE COMMAND LINE, NB: NO VALIDATION       */
DECLARE ( GMONTH, GDAY, GYEAR ) ADDRESS; /* MUST BE IN MM/DD/YYYY FORMAT */
CALL CL\$INIT;
GMONTH = CL\$NUMBER; GDAY = CL\$NUMBER; GYEAR = CL\$NUMBER;
CALL PR\$NUMBER( GMONTH );CALL PR\$CHAR( '/' );CALL PR\$NUMBER( GDAY );
CALL PR\$CHAR( '/');CALL PR\$NUMBER( GYEAR );CALL PR\$NL;

/* CONVERT AND PRINT THE DATE                                            */
IF GMONTH = 2 AND GDAY = 29
THEN DO;
CALL PR\$STRING( .'SAINT TIB''S DAY IN THE Y.O.L.D. \$' );
CALL PR\$NUMBER( GYEAR + 1166 );
END;
ELSE DO;
DECLARE ( YRDAY, SEASON, DAY, WKDAY ) ADDRESS;
YRDAY  = MLENGT(GMONTH)+GDAY;
SEASON = YRDAY / 73;
DAY    = YRDAY-SEASON*73;
WKDAY  = (YRDAY-1) MOD 5;
CALL PR\$STRING( DISDAY(WKDAY) );
CALL PR\$STRING( .', DAY \$' );
CALL PR\$NUMBER( DAY );
CALL PR\$STRING( .' OF \$' );
CALL PR\$STRING( DISSSN(SEASON) );
CALL PR\$STRING( .' IN THE Y.O.L.D \$' );
CALL PR\$NUMBER( GYEAR + 1166 );
IF      DAY = 5  THEN DO;
CALL PR\$NL;
CALL PR\$STRING( .'CELEBRATE \$' );
CALL PR\$STRING( HOLY5(SEASON) );
CALL PR\$STRING( .'DAY\$' );
END;
ELSE IF DAY = 50 THEN DO;
CALL PR\$NL;
CALL PR\$STRING( .'CELEBRATE \$' );
CALL PR\$STRING( HOLY50(SEASON) );
CALL PR\$STRING( .'FLUX\$' );
END;
END;
CALL PR\$NL;

EOF```
Output:

With the command line: `DISCORD 03/29/2023`:

```3/29/2023
PUNGENDAY, DAY 15 OF DISCORD IN THE Y.O.L.D 3189
```

## PowerBASIC

```#COMPILE EXE
#DIM ALL

'change this for systems that use a different character
\$DATESEP = "-"

FUNCTION day(date AS STRING) AS LONG
'date is same format as date\$
DIM tmpdash1 AS LONG, tmpdash2 AS LONG
tmpdash1 = INSTR(date, \$DATESEP)
tmpdash2 = INSTR(-1, date, \$DATESEP)
FUNCTION = VAL(MID\$(date, tmpdash1 + 1, tmpdash2 - tmpdash1 - 1))
END FUNCTION

FUNCTION month(date AS STRING) AS LONG
'date is same format as date\$
DIM tmpdash AS LONG
tmpdash = INSTR(date, \$DATESEP)
FUNCTION = VAL(LEFT\$(date, tmpdash - 1))
END FUNCTION

FUNCTION year(date AS STRING) AS LONG
'date is same format as date\$
DIM tmpdash AS LONG
tmpdash = INSTR(-1, date, \$DATESEP)
FUNCTION = VAL(MID\$(date, tmpdash + 1))
END FUNCTION

FUNCTION julian(date AS STRING) AS LONG
'date is same format as date\$
'doesn't account for leap years (not needed for ddate)
'days preceding 1st of month
'   jan feb mar apr may  jun  jul  aug  sep  oct  nov  dec
DATA 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
END FUNCTION

FUNCTION PBMAIN () AS LONG
'Season names
DATA "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"
'Weekdays
DATA "Setting Orange", "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle"

DIM dyear AS LONG, dseason AS STRING, dday AS LONG, dweekday AS STRING
DIM tmpdate AS STRING, jday AS LONG, result AS STRING

IF LEN(COMMAND\$) THEN
tmpdate = COMMAND\$
ELSE
tmpdate = DATE\$
END IF
dyear = year(tmpdate) + 1166
IF (2 = month(tmpdate)) AND (29 = day(tmpdate)) THEN
result = "Saint Tib's Day, " & STR\$(dyear) & " YOLD"
ELSE
jday = julian(tmpdate)
dseason = READ\$((jday \ 73) + 1)
dday = (jday MOD 73)
IF 0 = dday THEN dday = 73
dweekday = READ\$((jday MOD 5) + 6)
result = dweekday & ", " & dseason & " " & TRIM\$(STR\$(dday)) & ", " & TRIM\$(STR\$(dyear)) & " YOLD"
END IF

? result
END FUNCTION```

## PowerShell

Works with: powershell version 2
```function ConvertTo-Discordian ( [datetime]\$GregorianDate )
{
\$DayOfYear = \$GregorianDate.DayOfYear
\$Year = \$GregorianDate.Year + 1166
If ( [datetime]::IsLeapYear( \$GregorianDate.Year ) -and \$DayOfYear -eq 60 )
{ \$Day = "St. Tib's Day" }
Else
{
If ( [datetime]::IsLeapYear( \$GregorianDate.Year ) -and \$DayOfYear -gt 60 )
{ \$DayOfYear-- }
\$Weekday = @( 'Sweetmorn', 'Boomtime', 'Pungenday', 'Prickle-Prickle', 'Setting Orange' )[((\$DayOfYear - 1 ) % 5 )]
\$Season  = @( 'Chaos', 'Discord', 'Confusion', 'Bureaucracy', 'The Aftermath' )[( [math]::Truncate( ( \$DayOfYear - 1 ) / 73 ) )]
\$DayOfSeason = ( \$DayOfYear - 1 ) % 73 + 1
\$Day = "\$Weekday, \$Season \$DayOfSeason"
}
\$DiscordianDate = "\$Day, \$Year YOLD"
return \$DiscordianDate
}

ConvertTo-Discordian ([datetime]'1/5/2016')
ConvertTo-Discordian ([datetime]'2/29/2016')
ConvertTo-Discordian ([datetime]'12/8/2016')
```
Output:
```Setting Orange, Chaos 5, 3182 YOLD
St. Tib's Day, 3182 YOLD
Boomtime, The Aftermath 50, 3182 YOLD
```

## Prolog

Works with: SWI Prolog
```% See https://en.wikipedia.org/wiki/Discordian_calendar

main:-
test(2022, 4, 20),
test(2020, 5, 24),
test(2020, 2, 29),
test(2019, 7, 15),
test(2025, 3, 19),
test(2017, 12, 8).

test(Gregorian_year, Gregorian_month, Gregorian_day):-
ddate(Gregorian_year, Gregorian_month, Gregorian_day,
Discordian_date),
format('~|~`0t~d~2+-~|~`0t~d~2+-~|~`0t~d~2+: ~w~n', [Gregorian_year,
Gregorian_month, Gregorian_day, Discordian_date]).

ddate(Gregorian_year, 2, 29, Discordian_date):-
convert_year(Gregorian_year, Discordian_year),
swritef(Discordian_date, 'St. Tib\'s Day in the YOLD %w',
[Discordian_year]),
!.
ddate(Gregorian_year, Gregorian_month, Gregorian_day,
Discordian_date):-
convert_year(Gregorian_year, Discordian_year),
day_of_year(Gregorian_month, Gregorian_day, Daynum),
Season is Daynum//73,
Weekday is Daynum mod 5,
Day_of_season is 1 + Daynum mod 73,
season(Season, Season_name),
week_day(Weekday, Day_name),
(holy_day(Season, Day_of_season, Holy_day) ->
swritef(Discordian_date, '%w, day %w of %w in the YOLD %w. Celebrate %w!',
[Day_name, Day_of_season, Season_name, Discordian_year, Holy_day])
;
swritef(Discordian_date, '%w, day %w of %w in the YOLD %w',
[Day_name, Day_of_season, Season_name, Discordian_year])
).

convert_year(Gregorian_year, Discordian_year):-
Discordian_year is Gregorian_year + 1166.

day_of_year(M, D, N):-
month_days(M, Days),
N is Days + D - 1.

month_days(1, 0).
month_days(2, 31).
month_days(3, 59).
month_days(4, 90).
month_days(5, 120).
month_days(6, 151).
month_days(7, 181).
month_days(8, 212).
month_days(9, 243).
month_days(10, 273).
month_days(11, 304).
month_days(12, 334).

season(0, 'Chaos').
season(1, 'Discord').
season(2, 'Confusion').
season(3, 'Bureacracy').
season(4, 'The Aftermath').

week_day(0, 'Sweetmorn').
week_day(1, 'Boomtime').
week_day(2, 'Pungenday').
week_day(3, 'Prickle-Prickle').
week_day(4, 'Setting Orange').

holy_day(0, 5, 'Mungday').
holy_day(0, 50, 'Chaoflux').
holy_day(1, 5, 'Mojoday').
holy_day(1, 50, 'Discoflux').
holy_day(2, 50, 'Confuflux').
holy_day(3, 50, 'Bureflux').
holy_day(4, 50, 'Afflux').
```
Output:
```2022-04-20: Setting Orange, day 37 of Discord in the YOLD 3188
2020-05-24: Prickle-Prickle, day 71 of Discord in the YOLD 3186
2020-02-29: St. Tib's Day in the YOLD 3186
2019-07-15: Sweetmorn, day 50 of Confusion in the YOLD 3185. Celebrate Confuflux!
2025-03-19: Pungenday, day 5 of Discord in the YOLD 3191. Celebrate Mojoday!
2017-12-08: Boomtime, day 50 of The Aftermath in the YOLD 3183. Celebrate Afflux!
```

## PureBasic

```Procedure.s Discordian_Date(Y, M, D)
Protected DoY=DayOfYear(Date(Y,M,D,0,0,0)), Yold\$=Str(Y+1166)
Dim S.s(4)
S(0)="Chaos": S(1)="Discord": S(2)="Confusion": S(3)="Bureaucracy"
S(4)="The Aftermath"
If (Y%4=0 And Y%100) Or Y%400=0
If M=2 And D=29
ProcedureReturn "St. Tib's Day, YOLD " + Yold\$
ElseIf DoY>=2*30
DoY-1
EndIf
EndIf
ProcedureReturn S(DoY/73)+" "+Str(DoY%73)+", Yold "+Yold\$
EndProcedure```

## Python

```import datetime, calendar

DISCORDIAN_SEASONS = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"]

def ddate(year, month, day):
today = datetime.date(year, month, day)
is_leap_year = calendar.isleap(year)
if is_leap_year and month == 2 and day == 29:
return "St. Tib's Day, YOLD " + (year + 1166)

day_of_year = today.timetuple().tm_yday - 1

if is_leap_year and day_of_year >= 60:
day_of_year -= 1 # Compensate for St. Tib's Day

season, dday = divmod(day_of_year, 73)
return "%s %d, YOLD %d" % (DISCORDIAN_SEASONS[season], dday + 1, year + 1166)
```

## Racket

Translation of: D
```#lang racket/base
;;;; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
;;;; Derived from 'D' Implementation
;;;; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(require racket/date racket/match)

(define seasons '(Chaos     Discord   Confusion Bureaucracy     |The Aftermath|))
(define weekday '(Sweetmorn Boomtime  Pungenday Prickle-Prickle |Setting Orange|))
(define holiday '(Chaoflux  Discoflux Confuflux Bureflux        Afflux))

(define (ymd->date y m d) (seconds->date (find-seconds 0 0 0 d m y)))
(define (leap-year? y) (with-handlers ((exn? (λ (x) #f))) (= 29 (date-day (ymd->date y 2 29)))))

(define (discordian-date d)
(define leap? (leap-year? (date-year d)))
(define year-day (match* (leap? (date-year-day d))
[(#t (? (λ (D) (>= D 59)) d0)) d0]

(define season-day (modulo year-day 73)) ; season day
(define (list-ref-season l)
(define season-index (quotient year-day 73))
(symbol->string (list-ref l season-index)))

(string-append
(match* (season-day leap? (date-month d) (date-day d))
[( _ #t 2 29) "St. Tib's Day,"]
[((app (match-lambda
(5 apostle) (50 holiday) (_ #f))
(and (not #f) special)) _ _  _)
(string-append (list-ref-season special) ",")]
[( _  _ _  _)
(define week-day-name (list-ref weekday (modulo (sub1 year-day) 5)))
(format "~a, day ~a of ~a" week-day-name season-day (list-ref-season seasons))])
" in the YOLD " (number->string (+ (date-year d) 1166))))

(displayln (discordian-date (current-date)))

;; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
;; passing these tests makes me consistent with D implementation
(module+ test
(require rackunit)
(define discordian/ymd (compose discordian-date ymd->date))
(check-equal? (discordian/ymd 2010 7 22) "Pungenday, day 57 of Confusion in the YOLD 3176")
(check-equal? (discordian/ymd 2012 2 28) "Prickle-Prickle, day 59 of Chaos in the YOLD 3178")
(check-equal? (discordian/ymd 2012 2 29) "St. Tib's Day, in the YOLD 3178");
(check-equal? (discordian/ymd 2012 3  1) "Setting Orange, day 60 of Chaos in the YOLD 3178")
(check-equal? (discordian/ymd 2010 1  5) "Mungday, in the YOLD 3176")
(check-equal? (discordian/ymd 2011 5  3) "Discoflux, in the YOLD 3177"))
;; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~FIN
```
Output:
`Pungenday, day 47 of Confusion in the YOLD 3179`

## Raku

(formerly Perl 6)

Works with: rakudo version 2015-11-04
```my @seasons = << Chaos Discord Confusion Bureaucracy 'The Aftermath' >>;
my @days = << Sweetmorn Boomtime Pungenday Prickle-Prickle 'Setting Orange' >>;
sub ordinal ( Int \$n ) { \$n ~ ( \$n % 100 == 11|12|13
?? 'th' !! < th st nd rd th th th th th th >[\$n % 10] ) }

sub ddate ( Str \$ymd ) {
my \$d = DateTime.new: "{\$ymd}T00:00:00Z" or die;

my \$yold = 'in the YOLD ' ~ \$d.year + 1166;

my \$day_of_year0 = \$d.day-of-year - 1;

if \$d.is-leap-year {
return "St. Tib's Day, \$yold" if \$d.month == 2 and \$d.day == 29;
\$day_of_year0-- if \$day_of_year0 >= 60; # Compensate for St. Tib's Day
}

my \$weekday    = @days[    \$day_of_year0 mod  5     ];
my \$season     = @seasons[ \$day_of_year0 div 73     ];
my \$season_day = ordinal(  \$day_of_year0 mod 73 + 1 );

return "\$weekday, the \$season_day day of \$season \$yold";
}

say "\$_ is {.&ddate}" for < 2010-07-22 2012-02-28 2012-02-29 2012-03-01 >;
```
Output:
```2010-07-22 is Pungenday, the 57th day of Confusion in the YOLD 3176
2012-02-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3178
2012-02-29 is St. Tib's Day, in the YOLD 3178
2012-03-01 is Setting Orange, the 60th day of Chaos in the YOLD 3178
```

## Refal

```\$ENTRY Go {
, <Numb <Arg 1>>: s.GY
, <Numb <Arg 2>>: s.GM
, <Numb <Arg 3>>: s.GD
, <DisDate s.GY s.GM s.GD>: {
True e.Desc = <Prout e.Desc>;
False = <Prout 'Invalid input'>;
};
};

DisDate {
s.GY 2 29, <IsLeapYear s.GY>: True =
True 'St. Tib\'s day in the YOLD ' <Symb <+ 1166 s.GY>>;

s.GY s.GM s.GD, <Compare s.GM 1>: '-' = False;
s.GY s.GM s.GD, <Compare s.GM 12>: '+' = False;
s.GY s.GM s.GD, <Compare s.GD 1>: '-' = False;
s.GY s.GM s.GD, <Compare s.GD <Item s.GM <MonthLength>>>: '+' = False;

s.GY s.GM s.GD,
<+ <Item s.GM <MonthOffset>> s.GD>: s.DOY,
<Divmod <- s.DOY 1> 73>: (s.DS1) s.DD1,
<+ s.DS1 1>: s.DS,
<+ s.DD1 1>: s.DD,
<+ <Mod <- s.DOY 1> 5> 1>: s.DWD,

<Item s.DWD <Weekday>>: (e.Weekday),
<Item s.DS <Seasons>>: (e.Season),

e.Weekday ', day ' <Symb s.DD> ' of '
e.Season ' in the YOLD ' <Symb <+ 1166 s.GY>>: e.Desc,
s.DD: {
5, <Item s.DS <Holy5>>: (e.H) = True e.Desc ': celebrate ' e.H;
50, <Item s.DS <Holy50>>: (e.H) = True e.Desc ': celebrate ' e.H;
s.X = True e.Desc;
};
};

Item {
1   t.I e.X = t.I;
s.N t.I e.X = <Item <- s.N 1> e.X>;
};

IsLeapYear {
s.GY, <Mod s.GY 4>: 0 = True;
s.GY, <Mod s.GY 100>: 0 = False;
s.GY, <Mod s.GY 400>: 0 = True;
s.GY = False;
};

MonthOffset { = 0 31 59 90 120 151 181 212 243 273 304 334; };
MonthLength { = 31 28 31 30 31 30 31 31 30 31 30 31; };

Weekday { = ('Sweetmorn') ('Boomtime') ('Pungenday')
('Prickle-Prickle') ('Setting Orange'); };

Seasons { = ('Chaos') ('Discord') ('Confusion') ('Bureaucracy')
('The Aftermath'); };

Holy50 { = ('Chaoflux') ('Discoflux') ('Confuflux')
('Bureflux') ('Afflux'); };```
Output:
```\$ refgo ddate 2010 7 22
Pungenday, day 57 of Confusion in the YOLD 3176
\$ refgo ddate 2012 2 28
Prickle-Prickle, day 59 of Chaos in the YOLD 3178
\$ refgo ddate 2012 2 29
St. Tib's day in the YOLD 3178
\$ refgo ddate 2012 3 1
Setting Orange, day 60 of Chaos in the YOLD 3178
\$ refgo ddate 2010 1 5
Setting Orange, day 5 of Chaos in the YOLD 3176: celebrate Mungday
\$ refgo ddate 2011 5 3
Pungenday, day 50 of Discord in the YOLD 3177: celebrate Discoflux```

## REXX

This REXX version allows the   mm   or   dd   to be one or two digits.

Also, the year can be two or four digits, or it may be omitted.

If the Gregorian date is omitted or specified as an asterisk   (*),   the current date is used.

```/*REXX program  converts  a   mm/dd/yyyy    Gregorian date   ───►   a  Discordian date. */
@day.1= 'Sweetness'                             /*define the 1st day─of─Discordian─week*/
@day.2= 'Boomtime'                              /*   "    "  2nd  "   "      "       " */
@day.3= 'Pungenday'                             /*   "    "  3rd  "   "      "       " */
@day.4= 'Prickle-Prickle'                       /*   "    "  4th  "   "      "       " */
@day.5= 'Setting Orange'                        /*   "    "  5th  "   "      "       " */

@seas.0= "St. Tib's day,"                        /*define the leap─day of Discordian yr.*/
@seas.1= 'Chaos'                                 /*   "   1st season─of─Discordian─year.*/
@seas.2= 'Discord'                               /*   "   2nd    "    "      "       "  */
@seas.3= 'Confusion'                             /*   "   3rd    "    "      "       "  */
@seas.4= 'Bureaucracy'                           /*   "   4th    "    "      "       "  */
@seas.5= 'The Aftermath'                         /*   "   5th    "    "      "       "  */

parse arg  gM  '/'  gD  "/"  gY .                /*obtain the specified Gregorian date. */
if gM=='' | gM=="," | gM=='*'  then parse value  date("U")   with   gM  '/'  gD  "/"  gY .

gY=left( right( date(), 4), 4 - length(Gy) )gY   /*adjust for two─digit year or no year.*/

/* [↓]  day─of─year,  leapyear adjust. */
doy= date('d', gY || right(gM, 2, 0)right(gD ,2, 0),  "s")   -   (leapyear(gY)   &   gM>2)

dW= doy//5;                if dW==0  then dW=  5 /*compute the Discordian weekday.      */
dS= (doy-1) % 73  +  1                           /*   "     "       "     season.       */
dD= doy//73;               if dD==0  then dD= 73 /*   "     "       "     day─of─month. */
if leapyear(gY)  &  gM==2  &  gD==29 then ds=  0 /*is this St. Tib's day  (leapday) ?   */
if ds==0  then dD=                               /*adjust for the Discordian leap day.  */

say space(@day.dW','  @seas.dS dD","  gY + 1166) /*display Discordian date to terminal. */
exit                                             /*stick a fork in it,  we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
leapyear: procedure;   parse arg y               /*obtain a four─digit Gregorian year.  */
if y//4  \==  0  then return 0         /*Not  ÷  by 4?   Then not a leapyear. */
return y//100 \== 0  |  y//400 == 0    /*apply the  100  and  400  year rules.*/
```
input   when using the (various) following inputs of:
```  2/28/2012
2/29/2012
3/1/2012
7/22/2010
9/2/2012
12/31/2011
10/19/2015
12/31/2100
```
output   when using the above (various) inputs:
```Prickle-Prickle, Chaos 59, 3178
Setting Orange, St. Tib's day, 3178
Setting Orange, Chaos 60, 3178
Pungenday, Confusion 57, 3176
Setting Orange, Bureaucracy 26, 3178
Setting Orange, The Aftermath 73, 3177
Boomtime, Bureaucracy 73, 3181
Setting Orange, The Aftermath 73, 3266
```

## RPL

Works with: Halcyon Calc version 4.2.7
```≪ IF DUP2 R→C (29,2) == THEN DROP2 0
ELSE
IF DUP 1 == THEN DROP
ELSE
{ 31 59 90 120 151 181 212 243 273 304 334 }
SWAP 1 - GET +
END END
≫ ‘DQtm’ STO

≪ 1166 + ROT ROT DQtm
IF DUP THEN
1 - { "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange" }
OVER 5 MOD 1 + GET  ", " +
SWAP { "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath" }
OVER 73 / IP RND 1 + GET " " +
SWAP 73 MOD 1 + →STR + +
ELSE DROP "St. Tib's Day" END
", YoLD " + SWAP →STR +
≫ ‘DDATE’ STO
```
Input:
```19,1,2023 DDATE
29,2,2024 DDATE
25,12,800 DDATE
```
Output:
```3: "Prickle-Prickle, Chaos 19, YoLD 3189"
2: "St. Tib's Day, YoLD 3190"
1: "Prickle-Prickle, The Aftermath 67, YoLD 1966"
```

## Ruby

```require 'date'

class DiscordianDate
SEASON_NAMES = ["Chaos","Discord","Confusion","Bureaucracy","The Aftermath"]
DAY_NAMES = ["Sweetmorn","Boomtime","Pungenday","Prickle-Prickle","Setting Orange"]
YEAR_OFFSET = 1166
DAYS_PER_SEASON = 73
DAYS_PER_WEEK = 5
ST_TIBS_DAY_OF_YEAR = 60

def initialize(year, month, day)
gregorian_date = Date.new(year, month, day)
@day_of_year = gregorian_date.yday

@st_tibs = false
if gregorian_date.leap?
if @day_of_year == ST_TIBS_DAY_OF_YEAR
@st_tibs = true
elsif @day_of_year > ST_TIBS_DAY_OF_YEAR
@day_of_year -= 1
end
end

@season, @day = (@day_of_year-1).divmod(DAYS_PER_SEASON)
@day += 1     #←              ↑ fixes of-by-one error (only visible at season changes)
@year = gregorian_date.year + YEAR_OFFSET
end

def season
SEASON_NAMES[@season]
end

def weekday
if @st_tibs
"St. Tib's Day"
else
DAY_NAMES[(@day_of_year - 1) % DAYS_PER_WEEK]
end
end

def to_s
%Q{#{@st_tibs ? "St. Tib's Day" : "%s, %s %d" % [weekday, season, day]}, #{year} YOLD}
end
end
```

Testing:

```[[2012, 2, 28], [2012, 2, 29], [2012, 3, 1], [2011, 10, 5], [2015, 10, 19]].each do |date|
dd = DiscordianDate.new(*date)
puts "#{"%4d-%02d-%02d" % date} => #{dd}"
end
```
Output:
```2012-02-28 => Prickle-Prickle, Chaos 59, 3178 YOLD
2012-02-29 => St. Tib's Day, 3178 YOLD
2012-03-01 => Setting Orange, Chaos 60, 3178 YOLD
2011-10-05 => Pungenday, Bureaucracy 59, 3177 YOLD
2015-10-19 => Boomtime, Bureaucracy 73, 3181 YOLD```

## Rust

Compiler: Rust (1.21.0)

Library: chrono
Library: ddate

This example is taken in large part from the ddate crate and used with the permission of the author.

```extern crate chrono;

use chrono::NaiveDate;
use std::str::FromStr;

fn main() {
let date = std::env::args().nth(1).expect("Please provide a YYYY-MM-DD date.");
println!("{} is {}", date, NaiveDate::from_str(&date).unwrap().to_poee());
}

// The necessary constants for the seasons, weekdays, and holydays.
const HOLYDAYS: [&str; 5] = ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"];
const SEASONS: [&str; 5] = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"];
const WEEKDAYS: [&str; 5] = ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"];

// The necessary constants for the conversion.
const APOSTLE_HOLYDAY: usize = 5;
const CURSE_OF_GREYFACE: i32 = 1166;
const SEASON_DAYS: usize = 73;
const SEASON_HOLYDAY: usize = 50;
const ST_TIBS_DAY: usize = 59;
const WEEK_DAYS: usize = 5;

// This extends the `Datelike` trait of Rust's Chrono crate with a method that
// prints any Datelike type as a String.
impl<T: Datelike> DiscordianDate for T {}
pub trait DiscordianDate: Datelike {
fn to_poee(&self) -> String {
let day = self.ordinal0() as usize;
let leap = self.year() % 4 == 0 && self.year() % 100 != 0 || self.year() % 400 == 0;
let year = self.year() + CURSE_OF_GREYFACE;

if leap && day == ST_TIBS_DAY { return format!("St. Tib's Day, in the YOLD {}", year); }

let day_offset = if leap && day > ST_TIBS_DAY { day - 1 } else { day };

let day_of_season = day_offset % SEASON_DAYS + 1;

let season = SEASONS[day_offset / SEASON_DAYS];
let weekday = WEEKDAYS[day_offset % WEEK_DAYS];

let holiday = if day_of_season == APOSTLE_HOLYDAY {
format!("\nCelebrate {}", APOSTLES[day_offset / SEASON_DAYS])
} else if day_of_season == SEASON_HOLYDAY {
format!("\nCelebrate {}", HOLYDAYS[day_offset / SEASON_DAYS])
} else {
String::with_capacity(0)
};

format!("{}, the {} day of {} in the YOLD {}{}",
weekday, ordinalize(day_of_season), season, year, holiday)
}
}

/// A helper function to ordinalize a numeral.
fn ordinalize(num: usize) -> String {
let s = format!("{}", num);

let suffix = if s.ends_with('1') && !s.ends_with("11") {
"st"
} else if s.ends_with('2') && !s.ends_with("12") {
"nd"
} else if s.ends_with('3') && !s.ends_with("13") {
"rd"
} else {
"th"
};

format!("{}{}", s, suffix)
}
```
Output:
```\$ ./ddate -1166-1-1
-1166-1-1 is Sweetmorn, the 1st day of Chaos in the YOLD 0
\$ ./ddate 2000-2-28
2000-2-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3166
\$ ./ddate -4004-2-29
-4004-2-29 is St. Tib's Day, in the YOLD -2838
\$ ./ddate 1066-2-28
1066-2-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 2232
\$ ./ddate 1492-3-1
1492-3-1 is Setting Orange, the 60th day of Chaos in the YOLD 2658
\$ ./ddate 1492-9-26
1492-9-26 is Prickle-Prickle, the 50th day of Bureaucracy in the YOLD 2658
Celebrate Bureflux
\$ ./ddate 2012-10-24
2012-10-24 is Boomtime, the 5th day of The Aftermath in the YOLD 3178
\$

```

## Scala

Translation of: Python
```package rosetta

import java.util.GregorianCalendar
import java.util.Calendar

object DDate extends App {
private val DISCORDIAN_SEASONS = Array("Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath")

// month from 1-12; day from 1-31
def ddate(year: Int, month: Int, day: Int): String = {
val date = new GregorianCalendar(year, month - 1, day)
val dyear = year + 1166

val isLeapYear = date.isLeapYear(year)
if (isLeapYear && month == 2 && day == 29) // 2 means February
"St. Tib's Day " + dyear + " YOLD"
else {
var dayOfYear = date.get(Calendar.DAY_OF_YEAR) - 1
if (isLeapYear && dayOfYear >= 60)
dayOfYear -= 1 // compensate for St. Tib's Day

val dday = dayOfYear % 73
val season = dayOfYear / 73
"%s %d, %d YOLD".format(DISCORDIAN_SEASONS(season), dday + 1, dyear)
}
}
if (args.length == 3)
println(ddate(args(2).toInt, args(1).toInt, args(0).toInt))
else if (args.length == 0) {
val today = Calendar.getInstance
println(ddate(today.get(Calendar.YEAR), today.get(Calendar.MONTH)+1, today.get(Calendar.DAY_OF_MONTH)))
} else
println("usage: DDate [day month year]")
}
```

Test:

```scala rosetta.DDate 2010 7 22
Confusion 57, 3176 YOLD
scala rosetta.DDate 28 2 2012
Chaos 59, 3178 YOLD
scala rosetta.DDate 29 2 2012
St. Tib's Day 3178 YOLD
scala rosetta.DDate 1 3 2012
Chaos 60, 3178 YOLD
scala rosetta.DDate 19 10 2015
Bureaucracy 73, 3181 YOLD
```

## Seed7

```\$ include "seed7_05.s7i";
include "time.s7i";

const array string: seasons is [0] ("Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath");
const array string: weekday is [0] ("Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange");
const array string: holiday is [0] ("Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux");

const func string: discordianDate (in time: date) is func
result
var string: discordianDate is "";
local
var integer: dyear is 0;
var integer: doy is 0;
var integer: dsday is 0;
begin
dyear := date.year + 1166;
if isLeapYear(date.year) and date.month = 2 and date.day = 29 then
discordianDate := "St. Tib's Day, in the YOLD " <& dyear;
else
doy := dayOfYear(date);
if isLeapYear(date.year) and doy >= 60 then
decr(doy);
end if;
dsday := doy rem 73; # season day
if dsday = 5 then
discordianDate := apostle[doy div 73] <& ", in the YOLD " <& dyear;
elsif dsday = 50 then
discordianDate := holiday[doy div 73] <& ", in the YOLD " <& dyear;
else
discordianDate := weekday[pred(doy) rem 5] <&
", day " <& dsday <&
" of " <& seasons[doy div 73] <&
" in the YOLD " <& dyear;
end if;
end if;
end func;

const proc: main is func
local
var time: today is time.value;
begin
today := time(NOW);
writeln(strDate(today) <& " as Discordian date: " <& discordianDate(today));
if  discordianDate(date(2010, 7, 22)) = "Pungenday, day 57 of Confusion in the YOLD 3176" and
discordianDate(date(2012, 2, 28)) = "Prickle-Prickle, day 59 of Chaos in the YOLD 3178" and
discordianDate(date(2012, 2, 29)) = "St. Tib's Day, in the YOLD 3178" and
discordianDate(date(2012, 3,  1)) = "Setting Orange, day 60 of Chaos in the YOLD 3178" and
discordianDate(date(2010, 1,  5)) = "Mungday, in the YOLD 3176" and
discordianDate(date(2011, 5,  3)) = "Discoflux, in the YOLD 3177" then
writeln("Discordian date computation works.");
end if;
end func;```
Output:
```2013-05-12 as Discordian date: Boomtime, day 59 of Discord in the YOLD 3179
Discordian date computation works.
```

## Sidef

Translation of: Perl
```require('Time::Piece');

var seasons = %w(Chaos Discord Confusion Bureaucracy The\ Aftermath);
var week_days = %w(Sweetmorn Boomtime Pungenday Prickle-Prickle Setting\ Orange);

func ordinal (n) {
"#{n}" + (n % 100 ~~ [11,12,13] ? 'th'
: <th st nd rd th th th th th th>[n % 10])
}

func ddate(ymd) {
var d = %s'Time::Piece'.strptime(ymd, '%Y-%m-%d');
var yold = "in the YOLD #{d.year + 1166}";

var day_of_year0 = d.day_of_year;

if (d.is_leap_year) {
return "St. Tib's Day, #{yold}" if ([d.mon, d.mday] == [2, 29]);
day_of_year0-- if (day_of_year0 >= 60); # Compensate for St. Tib's Day
}

var weekday = week_days[day_of_year0 % week_days.len];
var season = seasons[day_of_year0 / 73];
var season_day = ordinal(day_of_year0 % 73 + 1);

return "#{weekday}, the #{season_day} day of #{season} #{yold}";
}

%w(2010-07-22 2012-02-28 2012-02-29 2012-03-01).each { |ymd|
say "#{ymd} is #{ddate(ymd)}"
}
```
Output:
```2010-07-22 is Pungenday, the 57th day of Confusion in the YOLD 3176
2012-02-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3178
2012-02-29 is St. Tib's Day, in the YOLD 3178
2012-03-01 is Setting Orange, the 60th day of Chaos in the YOLD 3178
```

## Swift

```import Foundation

let monthDays = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334]
let seasons = ["Chaos", "Discord", "Confusion", "Bureacracy", "The Aftermath"]
let dayNames = ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"]
let holyDays2 = ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"]

func discordianDate(date: Date) -> String {
let calendar = Calendar.current
let year = calendar.component(.year, from: date)
let month = calendar.component(.month, from: date)
let day = calendar.component(.day, from: date)
let discYear = year + 1166
if month == 2 && day == 29 {
return "St. Tib's Day in the YOLD \(discYear)"
}
let dayOfYear = monthDays[month - 1] + day - 1
let season = dayOfYear/73
let weekDay = dayOfYear % 5
let dayOfSeason = 1 + dayOfYear % 73
let ddate = "\(dayNames[weekDay]), day \(dayOfSeason) of \(seasons[season]) in the YOLD \(discYear)"
switch (dayOfSeason) {
case 5:
return ddate + ". Celebrate \(holyDays1[season])!"
case 50:
return ddate + ". Celebrate \(holyDays2[season])!"
default:
return ddate
}
}

func showDiscordianDate(year: Int, month: Int, day: Int) {
let calendar = Calendar.current
let date = calendar.date(from: DateComponents(year: year, month: month, day: day))!
let ddate = discordianDate(date: date)
let format = DateFormatter()
format.dateFormat = "yyyy-MM-dd"
print("\(format.string(from: date)): \(ddate)")
}

showDiscordianDate(year: 2022, month: 1, day: 20)
showDiscordianDate(year: 2020, month: 9, day: 21)
showDiscordianDate(year: 2020, month: 2, day: 29)
showDiscordianDate(year: 2019, month: 7, day: 15)
showDiscordianDate(year: 2025, month: 3, day: 19)
showDiscordianDate(year: 2017, month: 12, day: 8)
```
Output:
```2022-01-20: Setting Orange, day 20 of Chaos in the YOLD 3188
2020-09-21: Prickle-Prickle, day 45 of Bureacracy in the YOLD 3186
2020-02-29: St. Tib's Day in the YOLD 3186
2019-07-15: Sweetmorn, day 50 of Confusion in the YOLD 3185. Celebrate Confuflux!
2025-03-19: Pungenday, day 5 of Discord in the YOLD 3191. Celebrate Mojoday!
2017-12-08: Boomtime, day 50 of The Aftermath in the YOLD 3183. Celebrate Afflux!
```

## Tcl

```package require Tcl 8.5
proc disdate {year month day} {
# Get the day of the year
set now [clock scan [format %02d-%02d-%04d \$day \$month \$year] -format %d-%m-%Y]
scan [clock format \$now -format %j] %d doy

# Handle leap years
if {!(\$year%4) && ((\$year%100) || !(\$year%400))} {
if {\$doy == 60} {
return "St. Tib's Day, [expr {\$year + 1166}] YOLD"
} elseif {\$doy > 60} {
incr doy -1
}
}

# Main conversion to discordian format now that special cases are handled
incr doy -1; # Allow div/mod to work right
set season [lindex {Chaos Discord Confusion Bureaucracy {The Aftermath}} \
[expr {\$doy / 73}]]
set dos [expr {\$doy % 73 + 1}]
incr year 1166
return "\$season \$dos, \$year YOLD"
}
```

Demonstrating:

```puts [disdate 2010 7 22]; # Today
puts [disdate 2012 2 28]
puts [disdate 2012 2 29]
puts [disdate 2012 3 1]
```
Output:
```Confusion 57, 3176 YOLD
Chaos 59, 3178 YOLD
St. Tib's Day, 3178 YOLD
Chaos 60, 3178 YOLD
```

## Wren

Translation of: C#
Library: Wren-date
Library: Wren-fmt
```import "./date" for Date
import "./fmt" for Fmt

var seasons  = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"]
var weekdays = ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"]
var holidays = ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"]

var discordian = Fn.new { |date|
var y = date.year
var yold = " in the YOLD %(y + 1166)."
var doy = date.dayOfYear
if (Date.isLeapYear(y)) {
if (doy == 60) return "St. Tib's Day" + yold
if (doy > 60) doy = doy - 1
}
doy = doy - 1
var seasonDay = doy % 73 + 1
var seasonNr = (doy/73).floor
var weekdayNr = doy % 5
var holyday = ""
if (seasonDay == 5)  holyday = " Celebrate %(apostles[seasonNr])!"
if (seasonDay == 50) holyday = " Celebrate %(holidays[seasonNr])!"
var season = seasons[seasonNr]
var dow = weekdays[weekdayNr]
return Fmt.swrite("\$s, day \$s of \$s\$s\$s", dow, seasonDay, season, yold, holyday)
}

var dates = [
"2010-01-01",
"2010-01-05",
"2011-02-19",
"2012-02-28",
"2012-02-29",
"2012-03-01",
"2013-03-19",
"2014-05-03",
"2015-05-31",
"2016-06-22",
"2016-07-15",
"2017-08-12",
"2018-09-19",
"2018-09-26",
"2019-10-24",
"2020-12-08",
"2020-12-31"
]

for (date in dates) {
var dt = Date.parse(date)
System.print("%(date) = %(discordian.call(dt))")
}
```
Output:
```2010-01-01 = Sweetmorn, day 1 of Chaos in the YOLD 3176.
2010-01-05 = Setting Orange, day 5 of Chaos in the YOLD 3176. Celebrate Mungday!
2011-02-19 = Setting Orange, day 50 of Chaos in the YOLD 3177. Celebrate Chaoflux!
2012-02-28 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178.
2012-02-29 = St. Tib's Day in the YOLD 3178.
2012-03-01 = Setting Orange, day 60 of Chaos in the YOLD 3178.
2013-03-19 = Pungenday, day 5 of Discord in the YOLD 3179. Celebrate Mojoday!
2014-05-03 = Pungenday, day 50 of Discord in the YOLD 3180. Celebrate Discoflux!
2015-05-31 = Sweetmorn, day 5 of Confusion in the YOLD 3181. Celebrate Syaday!
2016-06-22 = Pungenday, day 27 of Confusion in the YOLD 3182.
2016-07-15 = Sweetmorn, day 50 of Confusion in the YOLD 3182. Celebrate Confuflux!
2017-08-12 = Prickle-Prickle, day 5 of Bureaucracy in the YOLD 3183. Celebrate Zaraday!
2018-09-19 = Boomtime, day 43 of Bureaucracy in the YOLD 3184.
2018-09-26 = Prickle-Prickle, day 50 of Bureaucracy in the YOLD 3184. Celebrate Bureflux!
2019-10-24 = Boomtime, day 5 of The Aftermath in the YOLD 3185. Celebrate Maladay!
2020-12-08 = Boomtime, day 50 of The Aftermath in the YOLD 3186. Celebrate Afflux!
2020-12-31 = Setting Orange, day 73 of The Aftermath in the YOLD 3186.
```

## zkl

Translation of: D
```fcn discordianDate(y,m,d){
var [const]
seasons=T("Chaos","Discord","Confusion","Bureaucracy","The Aftermath"),
weekday=T("Sweetmorn","Boomtime","Pungenday","Prickle-Prickle","Setting Orange"),
holiday=T("Chaoflux","Discoflux","Confuflux","Bureflux","Afflux"];

dYear,isLeapYear := y + 1166, Time.Date.isLeapYear(y);
if(isLeapYear and m==2 and d==29)
return("St. Tib's Day, in the YOLD " + dYear);

doy:=Time.Date.nthDayInYear(y,m,d);
if(isLeapYear and doy>=60) doy-=1;
dsDay:=(if(doy%73==0) 73 else doy%73); // Season day.
if(dsDay==5)  return(String(apostle[doy/73],", in the YOLD ",dYear));
if(dsDay==50) return(String(holiday[doy/73],", in the YOLD ",dYear));

dSeas:=seasons[(if(doy%73==0) doy-1 else doy)/73];
dWday:=weekday[(doy - 1)%5];
"%s, day %s of %s in the YOLD %s".fmt(dWday,dsDay,dSeas,dYear);
}```
```foreach y,m,d in (T(T(2010,7,22), T(2012,2,28), T(2012,2,29), T(2012,3,1),
T(2010,1, 5), T(2011,5, 3))){
"%d-%02d-%02d is -->%s".fmt(y,m,d,discordianDate(y,m,d)).println();
}```
Output:
```2010-07-22 is -->Pungenday, day 57 of Confusion in the YOLD 3176
2012-02-28 is -->Prickle-Prickle, day 59 of Chaos in the YOLD 3178
2012-02-29 is -->St. Tib's Day, in the YOLD 3178
2012-03-01 is -->Setting Orange, day 60 of Chaos in the YOLD 3178
2010-01-05 is -->Mungday, in the YOLD 3176
2011-05-03 is -->Discoflux, in the YOLD 3177
```