[@Miakardia][@JaceBeleren] One thing that I'd like to point out for consideration, is that the use of a calendar would depend on how wealthy, and therefore how educated you are. From the looks of things Logari society is generally of a Medieval level, which implies an agrarian society in which most of the population has minimal, if any education. So for most people, especially from smaller towns and villages outside the main cities, the most people would use is what season it is and possibly what phase the moon is in.