For many years, I've been fascinated with non-gregorian calendars. Several years ago, I started writing Perl modules for various of these modules, starting with the Discordian calendar, since it was both simple and silly. The following are various of the modules that I've worked on:
Please note that many of these modules have been superceeded by the Perl DateTime project. If you need to serious date/time related programming, please look there first. Thanks.