@RevRhizicNatterjacks I have a soft spot for Diane Duane's Middle Kingdoms calendar: four seasons of 90 days each, 5 days ("the Dreadnights") intercalated between autumn and winter, an additional Dreadnight every four years, and every 128 years the 208th day is dropped for the Gregorian correction (the following day being a public holiday, "the Festival of the Lost Day"). But if you want month- and week-equivalents, hard to do better than the French Republican calendar.