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Why throw away a perfectly good calendar? A website that lets you calculate when you can use it again.

🗓️​:blobcatreach:

whencanireusethiscalendar.com/

· SubwayTooter · 4 · 6 · 5

@polychrome
Great! I used to tediously calculate that myself with weird spreadsheets. That makes it much easier.

@polychrome
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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