The positivist calendar was a lunisolar calendar proposed by August Comte in 1849. The calendar had 13 months of 28 days, and a additional festival day commemorating the dead, and a leapday to celebrate holy women. It follows the Gregorian Calendar's rules for leap years, and starts on January 1. The extra days added to the last month are outside of the days of the week cycle, and so the first of a month is always a Monday. Year 1 in this calendar is equivilant to year 1789 in the Gregorian.

Months were named for:

  1. Moses
  2. Homer
  3. Aristotle
  4. Archimedes
  5. Caesar
  6. Saint Paul
  7. Charlemagne
  8. Dante
  9. Gutenberg
  10. Shakespeare
  11. Descartes
  12. Frederick the Great
  13. Bichat