The Revolutionary Calendar

The Revolutionary Calendar was officially in use from 22 September 1793 (1st Vendémiaire of year II) till the end of 1805 (11. Ventôse of XIV). The time period started actually on the 22nd September 1792. So the republican year started on the 22nd September (Gregorian) and ended after 12 month à 30 days on the 16th September of the following (Gregorian) year. The remaining 5 days (17th till 21st September) were added as the so called "Sanscullotides"). During leap years (1796, 1800, 1804) an additional Sanscullotide (the "jour complémentaire") was added.

How to calculate

Revolution Calendar to Gregorian Calendar

Example: 25 Brumaire an VIII
• take 1792 plus 8 years -> 1800
• since an I was 1792, subtract one from the year -> 1799
• check if the 25 Brumaire is between 22 September and 31 December -> YES -> year 1799 is correct
• lookup the the respective Gregorian day for the 25 Brumaire -> 15 November
• result: 15 November 1799

Example: 23 Ventôse an VI

• take 1792 plus 6 years -> 1798
• since an I was 1792, subtract one from the year -> 1797
• check if the 23 Ventôse is between 22 September and 31 December -> NO -> take 1797 plus 1 year -> year 1798 is correct
• lookup the the respective Gregorian day for the 23 Ventôse -> 13 March
• result: 13 March 1798

Gregorian Calendar to Revolution Calendar

Example: 7 October 1802

• take 1802 minus 1792 -> an X
• Since 1792 was an I add a one to the year -> XI
• check if the 7 October is between 22 September and 31 December -> YES (of course) -> an X is correct
• lookup the the respective revolutionary day for the 7 October -> 16 Vendémiaire
• result: 16 Vendémiaire an XI

Example: 17 May 1799

• take 1799 minus 1792 -> an VII
• Since 1792 was an I add a one to the year -> an VIII
• check if the he 22 may is between 22 September and 31 December -> NO (of course not) -> take an VIII minus 1 year -> an VII is correct
• lookup the the respective revolutionary day for the 22 May -> 3 Prairial
• result: 3 Prairial an VII

Exception

Be careful with the leap years (years with 366 days, 1796, 1800, 1804)! On leap years the 29 February corresponds with the 11 Ventôse. So every Gregorian day corresponds with the next Revolution Calendar day. So the 1 March is the 12 Ventôse and the 21 September is the Jour complémentaire.

1 Vendémiaire (Primidi) = 22 September
2 Vendémiaire (Duodi) = 23 September
3 Vendémiaire (Tridi) = 24 September
4 Vendémiaire (Quartidi) = 25 September
5 Vendémiaire (Quintidi) = 26 September
6 Vendémiaire (Sextidi) = 27 September
7 Vendémiaire (Septidi) = 28 September
8 Vendémiaire (Octidi) = 29 September
9 Vendémiaire (Nonidi) = 30 September
10 Vendémiaire (Decadi) = 1 October
11 Vendémiaire (Primidi) = 2 October
12 Vendémiaire (Duodi) = 3 October
13 Vendémiaire (Tridi) = 4 October
14 Vendémiaire (Quartidi) = 5 October
15 Vendémiaire (Quintidi) = 6 October
16 Vendémiaire (Sextidi) = 7 October
17 Vendémiaire (Septidi) = 8 October
18 Vendémiaire (Octidi) = 9 October
19 Vendémiaire (Nonidi) = 10 October
20 Vendémiaire (Decadi) = 11 October
21 Vendémiaire (Primidi) = 12 October
22 Vendémiaire (Duodi) = 13 October
23 Vendémiaire (Tridi) = 14 October
24 Vendémiaire (Quartidi) = 15 October
25 Vendémiaire (Quintidi) = 16 October
26 Vendémiaire (Sextidi) = 17 October
27 Vendémiaire (Septidi) = 18 October
28 Vendémiaire (Octidi) = 19 October
29 Vendémiaire (Nonidi) = 20 October
30 Vendémiaire (Decadi) = 21 October
1 Brumaire (Primidi) = 22 October
2 Brumaire (Duodi) = 23 October
3 Brumaire (Tridi) = 24 October
4 Brumaire (Quartidi) = 25 October
5 Brumaire (Quintidi) = 26 October
6 Brumaire (Sextidi) = 27 October
7 Brumaire (Septidi) = 28 October
8 Brumaire (Octidi) = 29 October
9 Brumaire (Nonidi) = 30 October
10 Brumaire (Decadi) = 31 October
11 Brumaire (Primidi) = 1 November
12 Brumaire (Duodi) = 2 November
13 Brumaire (Tridi) = 3 November
14 Brumaire (Quartidi) = 4 November
15 Brumaire (Quintidi) = 5 November
16 Brumaire (Sextidi) = 6 November
17 Brumaire (Septidi) = 7 November
18 Brumaire (Octidi) = 8 November
19 Brumaire (Nonidi) = 9 November
20 Brumaire (Decadi) = 10 November
21 Brumaire (Primidi) = 11 November
22 Brumaire (Duodi) = 12 November
23 Brumaire (Tridi) = 13 November
24 Brumaire (Quartidi) = 14 November
25 Brumaire (Quintidi) = 15 November
26 Brumaire (Sextidi) = 16 November
27 Brumaire (Septidi) = 17 November
28 Brumaire (Octidi) = 18 November
29 Brumaire (Nonidi) = 19 November
30 Brumaire (Decadi) = 20 November
1 Frimaire (Primidi) = 21 November
2 Frimaire (Duodi) = 22 November
3 Frimaire (Tridi) = 23 November
4 Frimaire (Quartidi) = 24 November
5 Frimaire (Quintidi) = 25 November
6 Frimaire (Sextidi) = 26 November
7 Frimaire (Septidi) = 27 November
8 Frimaire (Octidi) = 28 November
9 Frimaire (Nonidi) = 29 November
10 Frimaire (Decadi) = 30 November
11 Frimaire (Primidi) = 1 December
12 Frimaire (Duodi) = 2 December
13 Frimaire (Tridi) = 3 December
14 Frimaire (Quartidi) = 4 December
15 Frimaire (Quintidi) = 5 December
16 Frimaire (Sextidi) = 6 December
17 Frimaire (Septidi) = 7 December
18 Frimaire (Octidi) = 8 December
19 Frimaire (Nonidi) = 9 December
20 Frimaire (Decadi) = 10 December
21 Frimaire (Primidi) = 11 December
22 Frimaire (Duodi) = 12 December
23 Frimaire (Tridi) = 13 December
24 Frimaire (Quartidi) = 14 December
25 Frimaire (Quintidi) = 15 December
26 Frimaire (Sextidi) = 16 December
27 Frimaire (Septidi) = 17 December
28 Frimaire (Octidi) = 18 December
29 Frimaire (Nonidi) = 19 December
30 Frimaire (Decadi) = 20 December
1 Nivôse (Primidi) = 21 December
2 Nivôse (Duodi) = 22 December
3 Nivôse (Tridi) = 23 December
4 Nivôse (Quartidi) = 24 December
5 Nivôse (Quintidi) = 25 December
6 Nivôse (Sextidi) = 26 December
7 Nivôse (Septidi) = 27 December
8 Nivôse (Octidi) = 28 December
9 Nivôse (Nonidi) = 29 December
10 Nivôse (Decadi) = 30 December
11 Nivôse (Primidi) = 31 December
12 Nivôse (Duodi) = 1 January
13 Nivôse (Tridi) = 2 January
14 Nivôse (Quartidi) = 3 January
15 Nivôse (Quintidi) = 4 January
16 Nivôse (Sextidi) = 5 January
17 Nivôse (Septidi) = 6 January
18 Nivôse (Octidi) = 7 January
19 Nivôse (Nonidi) = 8 January
20 Nivôse (Decadi) = 9 January
21 Nivôse (Primidi) = 10 January
22 Nivôse (Duodi) = 11 January
23 Nivôse (Tridi) = 12 January
24 Nivôse (Quartidi) = 13 January
25 Nivôse (Quintidi) = 14 January
26 Nivôse (Sextidi) = 15 January
27 Nivôse (Septidi) = 16 January
28 Nivôse (Octidi) = 17 January
29 Nivôse (Nonidi) = 18 January
30 Nivôse (Decadi) = 19 January
1 Pluviôse (Primidi) = 20 January
2 Pluviôse (Duodi) = 21 January
3 Pluviôse (Tridi) = 22 January
4 Pluviôse (Quartidi) = 23 January
5 Pluviôse (Quintidi) = 24 January
6 Pluviôse (Sextidi) = 25 January
7 Pluviôse (Septidi) = 26 January
8 Pluviôse (Octidi) = 27 January
9 Pluviôse (Nonidi) = 28 January
10 Pluviôse (Decadi) = 29 January
11 Pluviôse (Primidi) = 30 January
12 Pluviôse (Duodi) = 31 January
13 Pluviôse (Tridi) = 1 February
14 Pluviôse (Quartidi) = 2 February
15 Pluviôse (Quintidi) = 3 February
16 Pluviôse (Sextidi) = 4 February
17 Pluviôse (Septidi) = 5 February
18 Pluviôse (Octidi) = 6 February
19 Pluviôse (Nonidi) = 7 February
20 Pluviôse (Decadi) = 8 February
21 Pluviôse (Primidi) = 9 February
22 Pluviôse (Duodi) = 10 February
23 Pluviôse (Tridi) = 11 February
24 Pluviôse (Quartidi) = 12 February
25 Pluviôse (Quintidi) = 13 February
26 Pluviôse (Sextidi) = 14 February
27 Pluviôse (Septidi) = 15 February
28 Pluviôse (Octidi) = 16 February
29 Pluviôse (Nonidi) = 17 February
30 Pluviôse (Decadi) = 18 February
1 Ventôse (Primidi) = 19 February
2 Ventôse (Duodi) = 20 February
3 Ventôse (Tridi) = 21 February
4 Ventôse (Quartidi) = 22 February
5 Ventôse (Quintidi) = 23 February
6 Ventôse (Sextidi) = 24 February
7 Ventôse (Septidi) = 25 February
8 Ventôse (Octidi) = 26 February
9 Ventôse (Nonidi) = 27 February
10 Ventôse (Decadi) = 28 February
11 Ventôse (Primidi) = 1 March
12 Ventôse (Duodi) = 2 March
13 Ventôse (Tridi) = 3 March
14 Ventôse (Quartidi) = 4 March
15 Ventôse (Quintidi) = 5 March
16 Ventôse (Sextidi) = 6 March
17 Ventôse (Septidi) = 7 March
18 Ventôse (Octidi) = 8 March
19 Ventôse (Nonidi) = 9 March
20 Ventôse (Decadi) = 10 March
21 Ventôse (Primidi) = 11 March
22 Ventôse (Duodi) = 12 March
23 Ventôse (Tridi) = 13 March
24 Ventôse (Quartidi) = 14 March
25 Ventôse (Quintidi) = 15 March
26 Ventôse (Sextidi) = 16 March
27 Ventôse (Septidi) = 17 March
28 Ventôse (Octidi) = 18 March
29 Ventôse (Nonidi) = 19 March
30 Ventôse (Decadi) = 20 March
1 Germinal (Primidi) = 21 March
2 Germinal (Duodi) = 22 March
3 Germinal (Tridi) = 23 March
4 Germinal (Quartidi) = 24 March
5 Germinal (Quintidi) = 25 March
6 Germinal (Sextidi) = 26 March
7 Germinal (Septidi) = 27 March
8 Germinal (Octidi) = 28 March
9 Germinal (Nonidi) = 29 March
10 Germinal (Decadi) = 30 March
11 Germinal (Primidi) = 31 March
12 Germinal (Duodi) = 1 April
13 Germinal (Tridi) = 2 April
14 Germinal (Quartidi) = 3 April
15 Germinal (Quintidi) = 4 April
16 Germinal (Sextidi) = 5 April
17 Germinal (Septidi) = 6 April
18 Germinal (Octidi) = 7 April
19 Germinal (Nonidi) = 8 April
20 Germinal (Decadi) = 9 April
21 Germinal (Primidi) = 10 April
22 Germinal (Duodi) = 11 April
23 Germinal (Tridi) = 12 April
24 Germinal (Quartidi) = 13 April
25 Germinal (Quintidi) = 14 April
26 Germinal (Sextidi) = 15 April
27 Germinal (Septidi) = 16 April
28 Germinal (Octidi) = 17 April
29 Germinal (Nonidi) = 18 April
30 Germinal (Decadi) = 19 April
1 Floréal (Primidi) = 20 April
2 Floréal (Duodi) = 21 April
3 Floréal (Tridi) = 22 April
4 Floréal (Quartidi) = 23 April
5 Floréal (Quintidi) = 24 April
6 Floréal (Sextidi) = 25 April
7 Floréal (Septidi) = 26 April
8 Floréal (Octidi) = 27 April
9 Floréal (Nonidi) = 28 April
10 Floréal (Decadi) = 29 April
11 Floréal (Primidi) = 30 April
12 Floréal (Duodi) = 1 May
13 Floréal (Tridi) = 2 May
14 Floréal (Quartidi) = 3 May
15 Floréal (Quintidi) = 4 May
16 Floréal (Sextidi) = 5 May
17 Floréal (Septidi) = 6 May
18 Floréal (Octidi) = 7 May
19 Floréal (Nonidi) = 8 May
20 Floréal (Decadi) = 9 May
21 Floréal (Primidi) = 10 May
22 Floréal (Duodi) = 11 May
23 Floréal (Tridi) = 12 May
24 Floréal (Quartidi) = 13 May
25 Floréal (Quintidi) = 14 May
26 Floréal (Sextidi) = 15 May
27 Floréal (Septidi) = 16 May
28 Floréal (Octidi) = 17 May
29 Floréal (Nonidi) = 18 May
30 Floréal (Decadi) = 19 May
1 Prairial (Primidi) = 20 May
2 Prairial (Duodi) = 21 May
3 Prairial (Tridi) = 22 May
4 Prairial (Quartidi) = 23 May
5 Prairial (Quintidi) = 24 May
6 Prairial (Sextidi) = 25 May
7 Prairial (Septidi) = 26 May
8 Prairial (Octidi) = 27 May
9 Prairial (Nonidi) = 28 May
10 Prairial (Decadi) = 29 May
11 Prairial (Primidi) = 30 May
12 Prairial (Duodi) = 31 May
13 Prairial (Tridi) = 1 June
14 Prairial (Quartidi) = 2 June
15 Prairial (Quintidi) = 3 June
16 Prairial (Sextidi) = 4 June
17 Prairial (Septidi) = 5 June
18 Prairial (Octidi) = 6 June
19 Prairial (Nonidi) = 7 June
20 Prairial (Decadi) = 8 June
21 Prairial (Primidi) = 9 June
22 Prairial (Duodi) = 10 June
23 Prairial (Tridi) = 11 June
24 Prairial (Quartidi) = 12 June
25 Prairial (Quintidi) = 13 June
26 Prairial (Sextidi) = 14 June
27 Prairial (Septidi) = 15 June
28 Prairial (Octidi) = 16 June
29 Prairial (Nonidi) = 17 June
30 Prairial (Decadi) = 18 June
1 Messidor (Primidi) = 19 June
2 Messidor (Duodi) = 20 June
3 Messidor (Tridi) = 21 June
4 Messidor (Quartidi) = 22 June
5 Messidor (Quintidi) = 23 June
6 Messidor (Sextidi) = 24 June
7 Messidor (Septidi) = 25 June
8 Messidor (Octidi) = 26 June
9 Messidor (Nonidi) = 27 June
10 Messidor (Decadi) = 28 June
11 Messidor (Primidi) = 29 June
12 Messidor (Duodi) = 30 June
13 Messidor (Tridi) = 1 July
14 Messidor (Quartidi) = 2 July
15 Messidor (Quintidi) = 3 July
16 Messidor (Sextidi) = 4 July
17 Messidor (Septidi) = 5 July
18 Messidor (Octidi) = 6 July
19 Messidor (Nonidi) = 7 July
20 Messidor (Decadi) = 8 July
21 Messidor (Primidi) = 9 July
22 Messidor (Duodi) = 10 July
23 Messidor (Tridi) = 11 July
24 Messidor (Quartidi) = 12 July
25 Messidor (Quintidi) = 13 July
26 Messidor (Sextidi) = 14 July
27 Messidor (Septidi) = 15 July
28 Messidor (Octidi) = 16 July
29 Messidor (Nonidi) = 17 July
30 Messidor (Decadi) = 18 July
1 Thermidor (Primidi) = 19 July
2 Thermidor (Duodi) = 20 July
3 Thermidor (Tridi) = 21 July
4 Thermidor (Quartidi) = 22 July
5 Thermidor (Quintidi) = 23 July
6 Thermidor (Sextidi) = 24 July
7 Thermidor (Septidi) = 25 July
8 Thermidor (Octidi) = 26 July
9 Thermidor (Nonidi) = 27 July
10 Thermidor (Decadi) = 28 July
11 Thermidor (Primidi) = 29 July
12 Thermidor (Duodi) = 30 July
13 Thermidor (Tridi) = 31 July
14 Thermidor (Quartidi) = 1 August
15 Thermidor (Quintidi) = 2 August
16 Thermidor (Sextidi) = 3 August
17 Thermidor (Septidi) = 4 August
18 Thermidor (Octidi) = 5 August
19 Thermidor (Nonidi) = 6 August
20 Thermidor (Decadi) = 7 August
21 Thermidor (Primidi) = 8 August
22 Thermidor (Duodi) = 9 August
23 Thermidor (Tridi) = 10 August
24 Thermidor (Quartidi) = 11 August
25 Thermidor (Quintidi) = 12 August
26 Thermidor (Sextidi) = 13 August
27 Thermidor (Septidi) = 14 August
28 Thermidor (Octidi) = 15 August
29 Thermidor (Nonidi) = 16 August
30 Thermidor (Decadi) = 17 August
1 Fructidor (Primidi) = 18 August
2 Fructidor (Duodi) = 19 August
3 Fructidor (Tridi) = 20 August
4 Fructidor (Quartidi) = 21 August
5 Fructidor (Quintidi) = 22 August
6 Fructidor (Sextidi) = 23 August
7 Fructidor (Septidi) = 24 August
8 Fructidor (Octidi) = 25 August
9 Fructidor (Nonidi) = 26 August
10 Fructidor (Decadi) = 27 August
11 Fructidor (Primidi) = 28 August
12 Fructidor (Duodi) = 29 August
13 Fructidor (Tridi) = 30 August
14 Fructidor (Quartidi) = 31 August
15 Fructidor (Quintidi) = 1 September
16 Fructidor (Sextidi) = 2 September
17 Fructidor (Septidi) = 3 September
18 Fructidor (Octidi) = 4 September
19 Fructidor (Nonidi) = 5 September
20 Fructidor (Decadi) = 6 September
21 Fructidor (Primidi) = 7 September
22 Fructidor (Duodi) = 8 September
23 Fructidor (Tridi) = 9 September
24 Fructidor (Quartidi) = 10 September
25 Fructidor (Quintidi) = 11 September
26 Fructidor (Sextidi) = 12 September
27 Fructidor (Septidi) = 13 September
28 Fructidor (Octidi) = 14 September
29 Fructidor (Nonidi) = 15 September
30 Fructidor (Decadi) = 16 September
Jour sansculottide (Fète de Vértu) = 17 September
Jour sansculottide (Fète du Génie) = 18 September
Jour sansculottide (Fète de Travail) = 19 September
Jour sansculottide (Fète de l'Opinion) = 20 September
Jour sansculottide (Fète de Récompenses) = 21 September
Jour sansculottide (Jour complémentaire)

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