Followed by the 5 (or 6 in a leap-year) Sansculotides [Feast Days]:
The years 3, 7 and 11 were leap-years. The calendar was abolished in the year 14. The historical accuracy of what the leap-year rule was is in dispute. It may have been every four years except on double zero years not divisible by 400, as in the Gregorian, but another source mentions a rule that would give 31 leap-years in every 128 year period.
Within each 30 day month were 3 "decades" of 10 days each, with the last being a day of rest. This modification of the week was an attempt to de-Christianize the system, but was very unpopular because there were 9 days before a day of rest.
I've cross-referenced this calendar in my perpetual calendar with several other solar calendars.
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