Discordian date
Convert a given date from the Gregorian calendar to the Discordian calendar.
You are encouraged to solve this task according to the task description, using any language you may know.
See Also
J
<lang j>leap=: _1j1 * 0 -/@:= 4 100 400 |/ {.@] bs=: ((#:{.) + 0 j. *@[ * {:@]) +. disc=: ((1+0 73 bs[ +^:(58<]) -/@todayno@(,: 1 1,~{.)@]) ,~1166+{.@])~ leap</lang>
Example use:
<lang> disc 2012 2 29 3178 1 59j1</lang>
see talk page.
PicoLisp
<lang PicoLisp>(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) ) ) ) ) )</lang>
Python
<lang 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)
</lang>
Scala
<lang scala>import java.util.{GregorianCalendar, Calendar}
val DISCORDIAN_SEASONS=Array("Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath") 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)
return "St. Tib's Day "+dyear+" YOLD"
var dayOfYear=date.get(Calendar.DAY_OF_YEAR)
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, dyear)
}</lang>
Tcl
<lang 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"
}</lang> Demonstrating: <lang tcl>puts [disdate 2010 7 22]; # Today puts [disdate 2012 2 28] puts [disdate 2012 2 29] puts [disdate 2012 3 1]</lang> Output:
Confusion 57, 3176 YOLD Chaos 59, 3178 YOLD St. Tib's Day, 3178 YOLD Chaos 60, 3178 YOLD
F#
<lang 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
let season, dday = Math.DivRem(dayOfYear, 73)
sprintf "%s %i, %i YOLD" seasons.[season] dday dyear</lang>