The New Age Calendar

The New Age Calendar was created at the end of the Purge War as a universal Calendar to unite the scattered peoples of the World in one cohesive Timeline, rather than the many hundreds of Disparate calendars that had arisen from the scattered mortal survivors.
Over time this Calendar did become used by the the Entire World as a means of convenience. It tracks and uses the movement of the Celestial Bodies of Almura, as determined by the mages of Roseweald.