The Unicorn Calendar is the Chat's (and by extension, the THDF galaxy's) official time-keeping system.
Established in the year of 1337, the Unicorn Calendar was used by the Galactic Senate for its entire existence. The Team Heretic Dinofox universal timeline revolves around the Battle of Havin IV, starting in the year 2554 on the Galactic Unicorn Calendar. The calendar is based off the yearly revolution of Eafth around its sun. However, each planet knows how to compensate so they can be up to date on current events and times. The Calendar is also accurate enough so that ships traveling in space can accurately tell their current time, no matter where in the galaxy they are.