Post-Imperial Calendar

The Post-Imperial Calendar, or the Neo-Craenate Calendar, is the most common calendar system in the world, and is almost completely ubiquitous in Altirus. It was introduced circa 130, and is divided into two calendar eras, with years prior to the year Razing of Vennhall denoted with "PC" (Pre-Collapse) and counting down towards it, and years after denoted with "PI" (Post-Imperial) and counting up away from it. The calendar itself is a revised version of the Late Craenate calendar, most notably, in its partitioning of eras based on the fall of the Craenate Empire.

Description
The Post-Imperial Calendar is a solar calendar, with a standard year consisting of 365 days, and a leap-year adding an additional day in Vesri. A year is divided into 12 months, each between 28 and 31 days long.

History
The calendar was proposed by King Lastor III of Bressia to commemorate the centennial of the Razing of Vennhall, though would not be put into place until thirty years later, after significant revision by Bressian and Chergarian scholars. Although the Late Craenate calendar year began in Vesri, roughly corresponding to the beginning of spring, the end of the year in the Post-Imperial Calendar was shifted to mid-winter to symbolize the hardships which surrounded the fall of the Empire.

The Post-Imperial Calendar would be adopted by all nations in Altirus by 450, and would see widespread adoption elsewhere within the next century.