Discordian calendar
The Discordian calendar is an alternate calendar used by some adherents of Discordianism. It is specified on page 00034 of the Principia Discordia.
The Discordian calendar begins with the year in which the Original Snub is considered to have occured, which is equivalent to 1166 B.C. on the Gregorian calendar. This year is denoted as year 0 YOLD (Year of Our Lady of Discord). As a reference, the year 2000 Anno Domini is 3166 YOLD.
The Discordian calendar has five seasons of 73 days each: Chaos, Discord, Confusion, Bureaucracy and The Aftermath.
The Discordian week consists of five days: Sweetmorn, Boomtime, Pungenday, Prickle-Prickle, and Setting Orange. The days of the week are named after the five basic Discordian elements, Sweet, Boom, Pungent, Prickle, and Orange. There are 73 of these weeks per year.
Every fourth year on the Discordian calendar, starting in YOLD 0002, an extra day is inserted between Chaos 59 and Chaos 60 called St. Tib's day. This is because 4 years + 1 day = 5, a holy number, but also conveniently coincides precisely with the Gregorian leap year. The result of this is that a given day of the year in the Discordian calendar always corresponds to the same day of the year in the Gregorian calendar, and vice versa.
There are Apostle Holydays on the 5th day of each season, named after the 5 Discordian apostles: Mungday, for Hung Mung; Mojoday, for Dr. Van Van Mojo; Syaday, for Sri Syadasti; Zaraday, for Zarathud; and Maladay, for Malaclypse the Elder. There are also Season Holydays on the 50th of each season: Chaoflux, Discoflux, Confuflux, Bureflux, and Afflux.
The given list of Apostle Holydays is not comprehensive and there may be many more, or many fewer. Discordians are practically forbidden from agreeing on which Apostles are apocryphal and which are cannonical; this list is derived from the official Holydays given in the Principia Discordia and may be consider heretical by some Discordians.
The Discordian Pentabarf was supposedly discovered in the Fifth year of the Caterpiller, though it is unclear what year this woud be YOLD.
ddate, a program that prints the current date in the Discordian calendar, is quietly included in most Linux distributions.