translating dates between the
Republican and Gregorian Calendars

To convert a Republican date to a Gregorian date

Suppose one wishes to find the Gregorian equivalent of 5 Germinal Year VII.

Year in Republican calendar: 2 3 4 5 6 7 8 9 10 11 12 13 14
Republican
month
Gregorian month 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
Vendémiaire Sept. 22 22 23 22 22 22 23 23 23 23 24 23 23
Brumaire October 22 22 23 22 22 22 23 23 23 23 24 23 23
Frimaire Nov. 21 21 22 21 21 21 22 22 22 22 23 22 22
Nivôse Dec. 21 21 22 21 21 21 22 22 22 22 23 22 22
    1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
Pluviôse Jan. 20 20 21 20 20 20 21 21 21 21 22 21 21
Ventôse Feb. 19 19 20 19 19 19 20 20 20 20 21 20 20
Germinal March 21 21 21 21 21 21 22 22 22 22 22 22 22
Floréal April 20 20 20 20 20 20 21 21 21 21 21 21 21
Prairial May 20 20 20 20 20 20 21 21 21 21 21 21 21
Messidor June 19 19 19 19 19 19 20 20 20 20 20 20 20
Thermidor July 19 19 19 19 19 19 20 20 20 20 20 20 20
Fructidor August 18 18 18 18 18 18 19 19 19 19 19 19 19
Complément Sept. 17 17 17 17 17 17 18 18 18 18 18 18 18

To convert a Gregorian date to a Republican date

Gregorian year: 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
Year of the Republic 1 2 3 4 5 6 7 8 9 10 11 12 13
Jan. Nivôse 12 12 12 11 12 12 12 11 11 11 11 10 11
Feb. Pluviôse 13 13 13 12 13 13 13 12 12 12 12 11 12
March Ventôse 11 11 11 11 11 11 11 10 10 10 10 10 10
April Germinal 12 12 12 12 12 12 12 11 11 11 11 11 11
May Floréal 12 12 12 12 12 12 12 11 11 11 11 11 11
June Prairial 13 13 13 13 13 13 13 12 12 12 12 12 12
July Messidor 13 13 13 13 13 13 13 12 12 12 12 12 12
August Thermidor 14 14 14 14 14 14 14 13 13 13 13 13 13
Sept. Fructidor 15 15 15 15 15 15 15 14 14 14 14 14 14
length of Complément in days 5 5 6 5 5 5 6 5 5 5 6 5 5
Year of the Republic 2 3 4 5 6 7 8 9 10 11 12 13 14
Oct. Vendémiaire 10 10 9 10 10 10 9 9 9 9 8 9 9
Nov. Brumaire 11 11 10 11 11 11 10 10 10 10 9 10 10
Dec. Frimaire 11 11 10 11 11 11 10 10 10 10 9 10 10

*Bear in mind that Jours Complément followed Fructidor, so running beyond the 30 days of Fructidor takes one into Jours Complément before Vendemiaire.

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