It's eras of time are B.S. and A.S., standing for "before Suhmer" and "after Suhmer". This is based off of Tuyutomi Suhmer, the man who helped create the boundaries of the five countries, ultimately creating Suhmer. It's months are the same as the real Christian Calendar. The earliest recorded piece of history is 32,000 B.S., when the first settlers of present-day Suhmer arrived. The latest date, present day, is 117 A.S., 117 years after Tuyutomi's birth.