Great! I used to tediously calculate that myself with weird spreadsheets. That makes it much easier.
FYI: Neglecting moon phases and similar things, there are only 14 different calendars:
Seven calendars can be distinguished by their first (and last) week day of the year. Add to that the same seven calendars, but each having a different last week day, due to being a leap year.
Then it's just a matter of finding out what year maps to which calendar.
@polychrome Let's switch to the old norse calendar so we only need one! Plus something for the "leap week" every 5 or 6 years. 😏
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