The calendar used in nearly all of known world, officially known as the Cathranian Calendar, is vaguely similar to our real-world calendar, but differs in some respects, particularly in names and lengths of weeks and months. Unlike the Gregorian Calendar, the Cathranian Calendar is more nicely divided and all months are the same length.
On this planet, years are 360 days. Call me lazy for doing this only to make months even; I don't care. You'd basically be right. Much like our calendar, there are 12 months in a year, each month being 30 days in length, similar to our calendar as well. The 12 months of the calendar are named mostly after people or locations throughout Cathran.
The months are, in order: Salgary, Tendargy, Endaraug, Sistaug, Raldraug, Gandrawn, Nicalawn, Colstaug, Gandraug, Toldraug, Candabary and Veldury. There are 8 days in a week, for a total of 45 weeks in a year. The days of the week are, in order: Frindoss, Dansabar, Landrabar, Eranbar, Ulstabar, Rindrobar, Thandabar and Visgoss. Frindoss and Visgoss are considered weekends.
Regarding the years, the common era of recorded history has no special notation; years are simply presented. In the years before that, the suffix BCY is added, which stands for Before Common Years. For instance, 52 years before the common era would have the year 52 BCY. Sometimes years after this period are given the suffix CY for Common Years, but this rare.
History is generally divided into groupings known as Ages. Each Age constitutes 200 years, so the year 312 would be in the Second Age and the year 1566 would be in the Seventh Age. Parts of prehistory, before the Common Years, are not divided into Ages.
This calendar is used in most of the know world including Salerin.