GS and BCF

Ever since the founding of the Council, time has been measured in GS years, or Galaxy Standard years. One GS year is equivalent to one year on Imperos, the capital of the Geosian Empire, which equates to roughly two years here on Earth. Time before the formation of the Council is measured in GS years BCF (Before Council Formation). For example, the Qui'Tharr Incident of GS-31 happened 31 GS years after the formation of the Council, and the Great Galactic Conflict of 22 BCF occurred 22 GS years before the Council was created.