French revolutionary calendar
The French revolutionary calendar is a calendar that was introduced in France in 1793 with the beginning of the revolutionary era. It was abolished by Napoleon I in 1806. In 1871, it was briefly introduced again by the Paris Commune.
The beginning of the year according to this calendar fell on the day of the autumnal equinox (it also changed every time). In 1793 (the first year according to the new calendar), the autumnal equinox fell on September 22 - it was on this day that the French Republic was proclaimed.
Each year was divided into twelve months of 30 days. The month consisted of three decades of ten days each, the last day of the decade being a day off for civil servants. At the end of the year, there were five more days, or six days in a leap year, that were not part of any month. These days had special names and were considered festive.
Months of the revolutionary calendar:
Vandemier (fr. vendémiaire) from September 22 to October 21 is the month of grape harvesting,
Brumaire (fr. brumaire) from October 22 to November 20 is the month of fogs,
Frimer (fr. frimaire) from November 21 to December 20 is the month of frosts;
Nivôse (fr. nivôse) from December 21 to January 19 is the month of snow,
Pluviosis (fr. pluviôse) from January 20 to February 18 is a month of rain,
Ventôse (fr. ventôse) from February 19 to March 20 is the month of the wind;
Germinal (fr. germinal) from March 21 to April 19 is the month of sprouts,
Floréal (fr. floréal) from April 20 to May 19 is the month of flowers,
Prairial (fr. prairial) from May 20 to June 18 is the month of grass;
Messidor (fr. messidor) from June 19 to July 18 is the month of harvest,
Thermidor (fr. thermidor) from July 19 to August 17 is a month of heat,
Fructidor (fr. fructidor) from August 18 to September 16 is the month of fruits.
French republican calendar online.