Standard Calendar

The Standard Calendar (also known as the Averte Statum Calendar or Imperial Calendar) was the calendar introduced by the Averte Statum after their takeover of the world. It measured time in years of 365 sidereal days, with a leap year (consisting of 366 sidereal days). 
The Standard Calendar dated events from the Great Unification, and the year following this event was termed Year Zero. During the Dark Ages, the Standard Calendar largely replaced the Gregorian Calendar, which had been used throughout much of the world for centuries and was based on the Christian Religion.
== Conception and ideology ==
The ideology behind the Standard Calendar was to focus history on the Averte Statum and their success in taking over the entire planet. It was also an attempt to rid the world of calendars based on nationality or religion, such as the Gregorian Calendar, the Chinese Calendar or the Islamic Calendar. 
Despite this, these older Calendars were commonly referenced. The Binsan Calendar also saw growing usage during the dark ages, as did the Cosmic Calendar and the Pi Calendar.