I am using Debian8 (Jessie) and I have discovered a concerning lack of the ddate command. I have very important programs that rely on getting charming date and cometary data from the ddate program. I have util-linux installed, but ddate isn't working. Perhaps some sort of evil has absconded with it. System users have already begun to complain, they cannot access the command ddate   %.
Which package contains ddate?
debian
apt install ddate should allow your essential research to proceed.In general, you can find packages with commands like apt search ddate, or various graphical package management frontents. You can also use the web site http://packages.debian.org/ to search (remembering that Jessie is currently testing).