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I was introduced to this and other calendar quirks by Professor Edward Reingold when taking introduction to CS at UIUC. One of our "machine problems" (AKA programming assignments) was to write a date converter that could convert between Gregorian, Julian, and the French Revolutionary calendars.

Dates from 1752 were in the test set.

The French Revolutionary Calendar was interesting. Ten days in the week, 3 weeks per month, with a extra "bonus" month at the end of the year with 5 (or 6) days. One reason it didn't last is that despite the change in the week length, workers only got 2 days off per week.