dozenal

The crazy calculator. Once you get used to it, you will love it :-)

A dozenal (duodecimal, or base-twelve) clock app and homescreen/lockscreen widget. Uses "X" for "ten" and "E" for "eleven."

This extension transfers the normal clock into a dozenal one. Releases: https://github.com/NicoVIII/Dozenal-Clock-GNOME-Shell-Extension/releases