The most popular calendar system in Kislev (after which are the Imperial and the Ungol Calendars) is the Gospodarin Calendar, which is state-supported, and thus used in all official documents. Like the Imperial Calendar, it breaks the year into 12 months and into eight-day weeks, but there are no intercalary festivals, and the year begins on a different date: Shoika Day, on the Summer Solstice.[1a]
As there are no festivals between the months, there are exactly 50 weeks in a year. The calendar begins from the date Khan-Queen Shoika founded the city of Kislev, which happened halfway though 1524 IC.[1a]