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The Discordian or Erisian calendar is an alternative calendar used by some adherents of Discordianism. It is specified on page 00034 of the Principia Discordia.
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ddate
ddate is a program that prints the current date in the Discordian calendar. It was a part of the util-linux package containing basic system utilities. As such, it had been included at least since 1994 in nearly all Linux distributions. In August 2011 however, one of the maintainers of util-linux made ddate optional, and by default omitted. In October 2012, ddate was completely removed from util-linux. The ddate program now has an upstream source. There was some controversy, but in the end, anyone wishing to reintroduce ddate to a distribution will have to create a separate package based on the new upstream. This has been done for Debian, FreeBSD, Fedora Linux, and Gentoo Linux for example.
⇒ The ddate source ripped out of util-linux
⇒ The ddate source ripped out of util-linux and completely rewritten