The positivist calendar was an attempt at calendar reform put forward by Auguste Comte in 1849 that used 13 months of 28 days rather than the Gregorian Calendar's 12 months of 30/31 days in adherence with his scientific study of society, Positivism. The calendar was a revision of the earlier eternal calendar developed by Marco Mastrofini, which also used 13 months of 28 days, and, like the positivist calendar, included a 365th day that didn't fall into any month.
The positivist calendar was an attempt at calendar reform put forward by Auguste Comte in 1849 that used 13 months of 28 days rather than the Gregorian Calendar's 12 months of 30/31 days in adherence with his scientific study of society, Positivism. The calendar was a revision of the earlier eternal calendar developed by Marco Mastrofini, which also used 13 months of 28 days, and, like the positivist calendar, included a 365th day that didn't fall into any month.
Source: Wikipedia "Positivist calendar" · CC BY-SA 4.0
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