ddate is a utility to display the Discordian date with a colorful history. It was removed from util-linux but the source code is still available on GitHub
Click the “Download Zip” box on the left.
save / extract in ~/src
sudo make install
There is no uninstall script, so to remove,
sudo rm /usr/local/bin/ddate
sudo rm /usr/local/share/man/man1/ddate.1.gz