The simplest system may be 13 months of 28 days: every month has exactly 4 weeks, starting with a Monday and ending with a Sunday.
The l
365th day (and 366th in leap years) is a bonus day, a jolly outside of weeks, maybe a bank holiday.
Everyone is happy.
But maybe it doesn't worth the effort to change a system which is the same in almost all the world, even with a simpler one
@lealternative_bot ho sempre trovato molto interessante il progetto, ma avendo l'originale civilization non l'ho mai provato in maniera approfondita