Aldrethine Calendar
The Aldrethine Calendar was devised by Aldreth of Galith, a Harbinger in the early days of the Axiom in approximately 30 3A. The Calendar marks that there are 3 "Ages", each beginning the year following the official agreed-upon day the prior cataclysms ended.
Within this Calendar, there are 13 months of 28 days, each sporting a 7 day week.