ddate is an
Emperor Norton Utility, and is part of the general distribution of
Red Hat Linux. It converts boring Gregorian dates into fun Discordian ones.
Various versions are available;
the source, DOS, and a
web interface. The man page is available
there.
FYI:
I use the following formatting sequence for my label
ddate +'MOTD on %A, the %e of %B, in the YOLD %Y%N. Celebrate %H!':