The calendar of the
discordians has 5
seasons, of 73 days each. Each week has 5
days. There are 5
Apostle holydays and 5
Season holydays, one per season.
St. Tib's Day occurs once every 4 years.
Happily January 1 is the same day as Chaos 1, so one can easily map Julian dates to discordian dates. (1991 Julian = 3157 Discordian, the next St. Tibs Day is in 3158)