French Republican Calendar

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French Republican Calendar of 1794, drawn by Philibert-Louis Debucourt

The French Republican Calendar (French: calendrier républicain français), also commonly called the French Revolutionary Calendar (calendrier révolutionnaire français) was a calendar created and implemented during the French Revolution, and used by the French government for about 12 years from late 1793 to 1805, and for 18 days by the Paris Commune in 1871. The revolutionary system was designed in part to remove all religious and royalist influences from the calendar, and was part of a larger attempt at decimalisation in France (which also included decimal time of day, decimalisation of currency, and metrication).

Overview and origins


Sylvain Maréchal, prominent anticlerical atheist, published the first edition of his Almanach des Honnêtes-gens (Almanac of Honest People) in 1788.[1] On pages 14–15 appears a calendar, consisting of twelve months. The first month is "Mars, ou Princeps" (March, or First), the last month is "Février, ou Duodécembre" (February, or Twelfth). (The months of September (meaning "the seventh") through December (meaning "the tenth") are already numeric names, although in the wrong order in both the Julian and the Gregorian calendar since the Romans changed the first month of a year from March to January.) The lengths of the months are the same, however, the 10th, 20th, and 30th are singled out of each month as the end of a décade (group of ten). Individual days were assigned, instead of to the traditional saints, to people noteworthy for mostly secular achievements; December 25 is assigned to both Jesus and Newton.

Later editions of the almanac would switch to the Republican Calendar.


A copy of the French Republican Calendar in the Historical Museum of Lausanne.

The days of the French Revolution and Republic saw many efforts to sweep away various trappings of the ancien régime (i.e. the old feudal monarchy); some of these were more successful than others. The new Republican government sought to institute, among other reforms, a new social and legal system, a new system of weights and measures (which became the tremendously successful metric system), and a new calendar. Amid nostalgia for the ancient Roman Republic, the theories of the Enlightenment were at their peak, and the devisers of the new systems looked to nature for their inspiration. Natural constants, multiples of ten, and Latin as well as Old Greek derivations formed the fundamental blocks from which the new systems were built.

The new calendar was created by a commission under the direction of the politician Charles-Gilbert Romme seconded by Claude Joseph Ferry and Charles-François Dupuis. They associated with their work the chemist Louis-Bernard Guyton de Morveau, the mathematician and astronomer Joseph-Louis Lagrange, the astronomer Joseph Jérôme Lefrançois de Lalande, the mathematician Gaspard Monge, the astronomer and naval geographer Alexandre Guy Pingré, and the poet, actor and playwright Fabre d'Églantine, who invented the names of the months, with the help of André Thouin, gardener at the Jardin des Plantes of the Muséum National d'Histoire Naturelle in Paris. As the rapporteur of the commission, Charles-Gilbert Romme presented the new calendar to the Jacobin-controlled National Convention on 23 September 1793, which adopted it on 24 October 1793 and also extended it proleptically to its epoch of 22 September 1792. It is because of his position as rapporteur of the commission that the creation of the republican calendar is attributed to Romme.[2]

The calendar is often called the "French Revolutionary Calendar" because it was created during the Revolution, but this is somewhat of a misnomer. Indeed, there was initially a debate as to whether the calendar should celebrate the Great Revolution, which began in July 1789, or the Republic, which was established in 1792.[3] Immediately following 14 July 1789, papers and pamphlets started calling 1789 year I of Liberty and the following years II and III. It was in 1792, with the practical problem of dating financial transactions, that the legislative assembly was confronted with the problem of the calendar. Originally, the choice of epoch was either 1 January 1789 or 14 July 1789. After some hesitation the assembly decided on 2 January 1792 that all official documents would use the "era of Liberty" and that the year IV of Liberty started on 1 January 1792. This usage was modified on 22 September 1792 when the Republic was proclaimed and the Convention decided that all public documents would be dated Year I of the French Republic. The decree of 2 January 1793 stipulated that the year II of the Republic began on 1 January 1793; this was revoked with the introduction of the new calendar, which set 22 September 1793 as the beginning of year II. The establishment of the Republic was used as the epochal date for the calendar; therefore, the calendar commemorates the Republic, not the Revolution. In France, it is known as the calendrier républicain as well as the calendrier révolutionnaire.

The Revolution is usually considered to have ended with the coup of 18 Brumaire (the putsch of Napoléon Bonaparte against the established constitutional regime of the Directoire) in Year VIII (9 November 1799). The French Republic ended with the coronation of Napoleon I as Empereur des Français (Emperor of the French) on 11 Frimaire, Year XIII (2 December 1804), a little more than a year before the calendar did.

The Concordat of 1801 re-established the Roman Catholic Church as an official institution in France (though not as a state religion) with effect from Easter Sunday, 18 April 1802, restoring the names of the days of the week with the ones they had in the Gregorian Calendar, while keeping the rest of the Republican Calendar, and fixing Sunday as the official day of rest and religious celebration.[4]

French coins of the period naturally used this calendar. Many show the year ("An") in Arabic numbers, although Roman numerals were used on some issues. Year 11 coins typically have a "XI" date to avoid confusion with the Roman "II".

Napoléon finally abolished the calendar with effect from 1 January 1806 (the day after 10 Nivôse an XIV), a little over twelve years after its introduction. However, it was used again during the brief Paris Commune, 6–23 May 1871 (16 Floréal–3 Prairial An LXXIX).

Some legal texts that were adopted when the Republican Calendar was officially in use are still in force in France and other nations or territories which at the time were incorporated into revolutionary France, such as present-day Belgium, Luxembourg and the German territories to the west of the Rhine river. These documents have kept their original dates for legal accuracy and citation purposes.[citation needed]

Calendar design

L AN 2 DE LA REPUBLIQUE FR. (Year 2 of the French Republic) on a barn near Geneva

Years appear in writing as Roman numerals (usually), with epoch 22 September 1792, the beginning of the "Republican Era" (the day the French First Republic was proclaimed, one day after the Convention abolished the monarchy). As a result, Roman Numeral I indicates the first year of the republic, that is, the year before the calendar actually came into use. By law, the beginning of each year was set at midnight, beginning on the day the apparent autumnal equinox falls at the Paris Observatory.

There were twelve months, each divided into three ten-day weeks called décades. The tenth day, décadi, replaced Sunday as the day of rest and festivity. The five or six extra days needed to approximate the solar or tropical year were placed after the months at the end of each year and called complementary days.

A period of four years ending on a leap day was to be called a "Franciade". The name "Olympique" was originally proposed[5] but changed to Franciade to commemorate the fact that it had taken the revolution four years to establish a republican government in France.[6]

The leap year was called Sextile, an allusion to the "bissextile" leap years of the Julian and Gregorian calendars, because it contained a sixth complementary day.

Decimal time

Each day in the Republican Calendar was divided into ten hours, each hour into 100 decimal minutes, and each decimal minute into 100 decimal seconds. Thus an hour was 144 conventional minutes (more than twice as long as a conventional hour), a minute was 86.4 conventional seconds (44% longer than a conventional minute), and a second was 0.864 conventional seconds (13.6% shorter than a conventional second).

Clocks were manufactured to display this decimal time, but it did not catch on. Mandatory use of decimal time was officially suspended 7 April 1795, although some cities continued to use decimal time as late as 1801.[7]


The Republican calendar year began the day the autumnal equinox occurred in Paris, and had twelve months of 30 days each, which were given new names based on nature, principally having to do with the prevailing weather in and around Paris.

  • Autumn:
    • Vendémiaire in French (from French vendange, derived from Latin vindemia, "grape harvest"), starting 22, 23, or 24 September
    • Brumaire (from French brume, "mist"), starting 22, 23, or 24 October
    • Frimaire (From French frimas, "frost"), starting 21, 22, or 23 November
  • Winter:
    • Nivôse (from Latin nivosus, "snowy"), starting 21, 22, or 23 December
    • Pluviôse (from French pluvieux, derived from Latin pluvius, "rainy"), starting 20, 21, or 22 January
    • Ventôse (from French venteux, derived from Latin ventosus, "windy"), starting 19, 20, or 21 February
  • Spring:
    • Germinal (from French germination), starting 20 or 21 March
    • Floréal (from French fleur, derived from Latin flos, "flower"), starting 20 or 21 April
    • Prairial (from French prairie, "meadow"), starting 20 or 21 May
  • Summer:
    • Messidor (from Latin messis, "harvest"), starting 19 or 20 June
    • Thermidor (or Fervidor) (from Greek thermon, "summer heat"), starting 19 or 20 July
    • Fructidor (from Latin fructus, "fruit"), starting 18 or 19 August

Note: On many printed calendars of Year II (1793–94), the month of Thermidor was named Fervidor (from Latin fervens, "hot").

Most of the month names were new words coined from French, Latin, or Greek. The endings of the names are grouped by season. "Dor" means "giving" in Greek.[8]

In Britain, a contemporary wit mocked the Republican Calendar by calling the months: Wheezy, Sneezy and Freezy; Slippy, Drippy and Nippy; Showery, Flowery and Bowery; Hoppy, Croppy and Poppy.[9] The Scottish historian Thomas Carlyle suggested somewhat more serious English names in his 1837 work The French Revolution: A History,[8] namely Vintagearious, Fogarious, Frostarious, Snowous, Rainous, Windous, Buddal, Floweral, Meadowal, Reapidor, Heatidor, and Fruitidor. Like the French originals, they suggest a meaning related to the season but are neologisms, rather than preexisting words.

Ten days of the week

French Revolutionary pocket watch showing ten-day décade names and thirty-day month numbers from the Republican Calendar, but with duodecimal time. On display at Neuchâtel Beaux-Arts museum.

The month is divided into three décades or 'weeks' of ten days each, named simply:

  • primidi (first day)
  • duodi (second day)
  • tridi (third day)
  • quartidi (fourth day)
  • quintidi (fifth day)
  • sextidi (sixth day)
  • septidi (seventh day)
  • octidi (eighth day)
  • nonidi (ninth day)
  • décadi (tenth day)

Décades were abandoned in Floréal an X (April 1802).[10]

Rural Calendar

The Catholic Church used a calendar of saints, which named each day of the year after an associated saint. To reduce the influence of the Church, Fabre d'Églantine introduced a Rural Calendar in which each day of the year had a unique name associated with the rural economy, stated to correspond to the time of year. Every décadi (ending in 0) was named after an agricultural tool. Each quintidi (ending in 5) was named for a common animal. The rest of the days were named for "grain, pasture, trees, roots, flowers, fruits" and other plants, except for the first month of winter, Nivôse, during which the rest of the days were named after minerals.[11][12]


Vendémiaire commence le 22 septembre.jpg
Vendémiaire (22 September – 21 October)
1 22 Sep Raisin (Grape)
2 23 Sep Safran (Saffron)
3 24 Sep Châtaigne (Chestnut)
4 25 Sep Colchique (Crocus)
5 26 Sep Cheval (Horse)
6 27 Sep Balsamine (Impatiens)
7 28 Sep Carotte (Carrot)
8 29 Sep Amaranthe (Amaranth)
9 30 Sep Panais (Parsnip)
10 1 Oct Cuve (Vat)
11 2 Oct Pomme de terre (Potato)
12 3 Oct Immortelle (Strawflower)
13 4 Oct Potiron (Winter squash)
14 5 Oct Réséda (Mignonette)
15 6 Oct Âne (Donkey)
16 7 Oct Belle de nuit (Four o'clock flower)
17 8 Oct Citrouille (Pumpkin)
18 9 Oct Sarrasin (Buckwheat)
19 10 Oct Tournesol (Sunflower)
20 11 Oct Pressoir (Wine-Press)
21 12 Oct Chanvre (Hemp)
22 13 Oct Pêche (Peach)
23 14 Oct Navet (Turnip)
24 15 Oct Amaryllis (Amaryllis)
25 16 Oct Bœuf (Ox)
26 17 Oct Aubergine (Eggplant)
27 18 Oct Piment (Chili pepper)
28 19 Oct Tomate (Tomato)
29 20 Oct Orge (Barley)
30 21 Oct Tonneau (Barrel)
Brumaire commence le 23 octobre.jpg
Brumaire (22 October – 20 November)
1 22 Oct Pomme (Apple)
2 23 Oct Céleri (Celery)
3 24 Oct Poire (Pear)
4 25 Oct Betterave (Beet root)
5 26 Oct Oie (Goose)
6 27 Oct Héliotrope (Heliotrope)
7 28 Oct Figue (Common Fig)
8 29 Oct Scorsonère (Black Salsify)
9 30 Oct Alisier (Chequer Tree)
10 31 Oct Charrue (Plough)
11 1 Nov Salsifis (Salsify)
12 2 Nov Mâcre (Water chestnut)
13 3 Nov Topinambour (Jerusalem artichoke)
14 4 Nov Endive (Endive)
15 5 Nov Dindon (Turkey)
16 6 Nov Chervis (Skirret)
17 7 Nov Cresson (Watercress)
18 8 Nov Dentelaire (Leadworts)
19 9 Nov Grenade (Pomegranate)
20 10 Nov Herse (Harrow)
21 11 Nov Bacchante (Baccharis)
22 12 Nov Azerole (Azarole)
23 13 Nov Garance (Madder)
24 14 Nov Orange (Orange)
25 15 Nov Faisan (Pheasant)
26 16 Nov Pistache (Pistachio)
27 17 Nov Macjonc (Tuberous pea)
28 18 Nov Coing (Quince)
29 19 Nov Cormier (Service tree)
30 20 Nov Rouleau (Roller)
Frimaire commence le 22 novembre.jpg
Frimaire (21 November – 20 December)
1 21 Nov Raiponce (Rampion)
2 22 Nov Turneps (Turnip)
3 23 Nov Chicorée (Chicory)
4 24 Nov Nèfle (Medlar)
5 25 Nov Cochon (Pig)
6 26 Nov Mâche (Corn salad)
7 27 Nov Chou-fleur (Cauliflower)
8 28 Nov Miel (Honey)
9 29 Nov Genièvre (Juniper)
10 30 Nov Pioche (Pickaxe)
11 1 Dec Cire (Wax)
12 2 Dec Raifort (Horseradish)
13 3 Dec Cèdre (Cedar tree)
14 4 Dec Sapin (Fir)
15 5 Dec Chevreuil (Roe deer)
16 6 Dec Ajonc (Gorse)
17 7 Dec Cyprès (Cypress Tree)
18 8 Dec Lierre (Ivy)
19 9 Dec Sabine (Savin Juniper)
20 10 Dec Hoyau (Grub-hoe)
21 11 Dec Érable à sucre (Sugar Maple)
22 12 Dec Bruyère (Heather)
23 13 Dec Roseau (Reed plant)
24 14 Dec Oseille (Sorrel)
25 15 Dec Grillon (Cricket)
26 16 Dec Pignon (Pine nut)
27 17 Dec Liège (Cork)
28 18 Dec Truffe (Truffle)
29 19 Dec Olive (Olive)
30 20 Dec Pelle (Shovel)


Nivôse commence le 22 décembre.jpg
Nivôse (21 December – 19 January)
1 21 Dec Tourbe (Peat)
2 22 Dec Houille (Coal)
3 23 Dec Bitume (Bitumen)
4 24 Dec Soufre (Sulphur)
5 25 Dec Chien (Dog)
6 26 Dec Lave (Lava)
7 27 Dec Terre végétale (Topsoil)
8 28 Dec Fumier (Manure)
9 29 Dec Salpêtre (Saltpeter)
10 30 Dec Fléau (Flail)
11 31 Dec Granit (Granite)
12 1 Jan Argile (Clay)
13 2 Jan Ardoise (Slate)
14 3 Jan Grès (Sandstone)
15 4 Jan Lapin (Rabbit)
16 5 Jan Silex (Flint)
17 6 Jan Marne (Marl)
18 7 Jan Pierre à chaux (Limestone)
19 8 Jan Marbre (Marble)
20 9 Jan Van (Winnowing basket)
21 10 Jan Pierre à plâtre (Gypsum)
22 11 Jan Sel (Salt)
23 12 Jan Fer (Iron)
24 13 Jan Cuivre (Copper)
25 14 Jan Chat (Cat)
26 15 Jan Étain (Tin)
27 16 Jan Plomb (Lead)
28 17 Jan Zinc (Zinc)
29 18 Jan Mercure (Mercury)
30 19 Jan Crible (Sieve)
Pluviôse commence le 21 ou 22 janvier.jpg
Pluviôse (20 January – 18 February)
1 20 Jan Lauréole (Spurge-laurel)
2 21 Jan Mousse (Moss)
3 22 Jan Fragon (Butcher's Broom)
4 23 Jan Perce-neige (Snowdrop)
5 24 Jan Taureau (Bull)
6 25 Jan Laurier-thym (Laurustinus)
7 26 Jan Amadouvier (Tinder polypore)
8 27 Jan Mézéréon (Daphne mezereum)
9 28 Jan Peuplier (Poplar)
10 29 Jan Coignée (Axe)
11 30 Jan Ellébore (Hellebore)
12 31 Jan Brocoli (Broccoli)
13 1 Feb Laurier (Bay laurel)
14 2 Feb Avelinier (Filbert)
15 3 Feb Vache (Cow)
16 4 Feb Buis (Box Tree)
17 5 Feb Lichen (Lichen)
18 6 Feb If (Yew tree)
19 7 Feb Pulmonaire (Lungwort)
20 8 Feb Serpette (Billhook)
21 9 Feb Thlaspi (Pennycress)
22 10 Feb Thimelé (Rose Daphne)
23 11 Feb Chiendent (Couch grass)
24 12 Feb Trainasse (Common Knotgrass)
25 13 Feb Lièvre (Hare)
26 14 Feb Guède (Woad)
27 15 Feb Noisetier (Hazel)
28 16 Feb Cyclamen (Cyclamen)
29 17 Feb Chélidoine (Celandine)
30 18 Feb Traîneau (Sleigh)
Ventôse commence le 20 ou 21 février.jpg
Ventôse (19 February – 20 March)
1 19 Feb Tussilage (Coltsfoot)
2 20 Feb Cornouiller (Dogwood)
3 21 Feb Violier (Matthiola)
4 22 Feb Troène (Privet)
5 23 Feb Bouc (Billygoat)
6 24 Feb Asaret (Wild Ginger)
7 25 Feb Alaterne (Italian Buckthorn)
8 26 Feb Violette (Violet)
9 27 Feb Marceau (Goat Willow)
10 28 Feb Bêche (Spade)
11 1 Mar Narcisse (Narcissus)
12 2 Mar Orme (Elm)
13 3 Mar Fumeterre (Common fumitory)
14 4 Mar Vélar (Hedge mustard)
15 5 Mar Chèvre (Goat)
16 6 Mar Épinard (Spinach)
17 7 Mar Doronic (Doronicum)
18 8 Mar Mouron (Pimpernel)
19 9 Mar Cerfeuil (Chervil)
20 10 Mar Cordeau (Twine)
21 11 Mar Mandragore (Mandrake)
22 12 Mar Persil (Parsley)
23 13 Mar Cochléaria (Scurvy-grass)
24 14 Mar Pâquerette (Daisy)
25 15 Mar Thon (Tuna)
26 16 Mar Pissenlit (Dandelion)
27 17 Mar Sylvie (Wood Anemone)
28 18 Mar Capillaire (Maidenhair fern)
29 19 Mar Frêne (Ash tree)
30 20 Mar Plantoir (Dibber)


Germinal commence le 21 ou 22 mars.jpg
Germinal (21 March – 19 April)
1 21 Mar Primevère (Primrose)
2 22 Mar Platane (Plane Tree)
3 23 Mar Asperge (Asparagus)
4 24 Mar Tulipe (Tulip)
5 25 Mar Poule (Hen)
6 26 Mar Bette (Chard)
7 27 Mar Bouleau (Birch)
8 28 Mar Jonquille (Daffodil)
9 29 Mar Aulne (Alder)
10 30 Mar Couvoir (Hatchery)
11 31 Mar Pervenche (Periwinkle)
12 1 Apr Charme (Hornbeam)
13 2 Apr Morille (Morel)
14 3 Apr Hêtre (Beech Tree)
15 4 Apr Abeille (Bee)
16 5 Apr Laitue (Lettuce)
17 6 Apr Mélèze (Larch)
18 7 Apr Ciguë (Hemlock)
19 8 Apr Radis (Radish)
20 9 Apr Ruche (Hive)
21 10 Apr Gainier (Judas tree)
22 11 Apr Romaine (Romaine lettuce)
23 12 Apr Marronnier (Horse chestnut)
24 13 Apr Roquette (Arugula or Rocket)
25 14 Apr Pigeon (Pigeon)
26 15 Apr Lilas (Lilac)
27 16 Apr Anémone (Anemone)
28 17 Apr Pensée (Pansy)
29 18 Apr Myrtille (Bilberry)
30 19 Apr Greffoir (Knife)
Floréal commence le 21 avril.jpg
Floréal (20 April – 19 May)
1 20 Apr Rose (Rose)
2 21 Apr Chêne (Oak Tree)
3 22 Apr Fougère (Fern)
4 23 Apr Aubépine (Hawthorn)
5 24 Apr Rossignol (Nightingale)
6 25 Apr Ancolie (Common Columbine)
7 26 Apr Muguet (Lily of the valley)
8 27 Apr Champignon (Button mushroom)
9 28 Apr Hyacinthe (Hyacinth)
10 29 Apr Râteau (Rake)
11 30 Apr Rhubarbe (Rhubarb)
12 1 May Sainfoin (Sainfoin)
13 2 May Bâton d'or (Wallflower)
14 3 May Chamerisier (Fan Palm tree)
15 4 May Ver à soie (Silkworm)
16 5 May Consoude (Comfrey)
17 6 May Pimprenelle (Salad burnet)
18 7 May Corbeille d'or (Basket of Gold)
19 8 May Arroche (Orache)
20 9 May Sarcloir (Garden hoe)
21 10 May Statice (Thrift)
22 11 May Fritillaire (Fritillary)
23 12 May Bourrache (Borage)
24 13 May Valériane (Valerian)
25 14 May Carpe (Carp)
26 15 May Fusain (Spindle (shrub))
27 16 May Civette (Chive)
28 17 May Buglosse (Bugloss)
29 18 May Sénevé (Wild mustard)
30 19 May Houlette (Shepherd's crook)
Prairial commence le 21 mai.jpg
Prairial (20 May – 18 June)
1 20 May Luzerne (Alfalfa)
2 21 May Hémérocalle (Daylily)
3 22 May Trèfle (Clover)
4 23 May Angélique (Angelica)
5 24 May Canard (Duck)
6 25 May Mélisse (Lemon balm)
7 26 May Fromental (Oat grass)
8 27 May Martagon (Martagon lily)
9 28 May Serpolet (Wild Thyme)
10 29 May Faux (Scythe)
11 30 May Fraise (Strawberry)
12 31 May Bétoine (Woundwort)
13 1 Jun Pois (Pea)
14 2 Jun Acacia (Acacia)
15 3 Jun Caille (Quail)
16 4 Jun Œillet (Carnation)
17 5 Jun Sureau (Elderberry)
18 6 Jun Pavot (Poppy plant)
19 7 Jun Tilleul (Linden or Lime tree)
20 8 Jun Fourche (Pitchfork)
21 9 Jun Barbeau (Cornflower)
22 10 Jun Camomille (Camomile)
23 11 Jun Chèvrefeuille (Honeysuckle)
24 12 Jun Caille-lait (Bedstraw)
25 13 Jun Tanche (Tench)
26 14 Jun Jasmin (Jasmine)
27 15 Jun Verveine (Verbena)
28 16 Jun Thym (Thyme)
29 17 Jun Pivoine (Peony)
30 18 Jun Chariot (Hand Cart)


Messidor commence le 21 ou 22 juin.jpg
Messidor (19 June – 18 July)
1 19 Jun Seigle (Rye)
2 20 Jun Avoine (Oat)
3 21 Jun Oignon (Onion)
4 22 Jun Véronique (Speedwell)
5 23 Jun Mulet (Mule)
6 24 Jun Romarin (Rosemary)
7 25 Jun Concombre (Cucumber)
8 26 Jun Échalote (Shallot)
9 27 Jun Absinthe (Wormwood)
10 28 Jun Faucille (Sickle)
11 29 Jun Coriandre (Coriander)
12 30 Jun Artichaut (Artichoke)
13 1 Jul Girofle (Clove)
14 2 Jul Lavande (Lavender)
15 3 Jul Chamois (Chamois)
16 4 Jul Tabac (Tobacco)
17 5 Jul Groseille (Redcurrant)
18 6 Jul Gesse (Hairy Vetchling)
19 7 Jul Cerise (Cherry)
20 8 Jul Parc (Park)
21 9 Jul Menthe (Mint)
22 10 Jul Cumin (Cumin)
23 11 Jul Haricot (Bean)
24 12 Jul Orcanète (Alkanet)
25 13 Jul Pintade (Guinea fowl)
26 14 Jul Sauge (Sage Plant)
27 15 Jul Ail (Garlic)
28 16 Jul Vesce (Tare)
29 17 Jul Blé (Wheat)
30 18 Jul Chalémie (Shawm)
Thermidor commence le 20 ou 21 juillet.jpg
Thermidor (19 July – 17 August)
1 19 Jul Épeautre (Spelt)
2 20 Jul Bouillon blanc (Common mullein)
3 21 Jul Melon (Melon)
4 22 Jul Ivraie (Ryegrass)
5 23 Jul Bélier (Ram)
6 24 Jul Prêle (Horsetail)
7 25 Jul Armoise (Mugwort)
8 26 Jul Carthame (Safflower)
9 27 Jul Mûre (Blackberry)
10 28 Jul Arrosoir (Watering can)
11 29 Jul Panic (Switchgrass)
12 30 Jul Salicorne (Common Glasswort)
13 31 Jul Abricot (Apricot)
14 1 Aug Basilic (Basil)
15 2 Aug Brebis (Ewe)
16 3 Aug Guimauve (Marshmallow)
17 4 Aug Lin (Flax)
18 5 Aug Amande (Almond)
19 6 Aug Gentiane (Gentian)
20 7 Aug Écluse (Lock)
21 8 Aug Carline (Carline thistle)
22 9 Aug Câprier (Caper)
23 10 Aug Lentille (Lentil)
24 11 Aug Aunée (Inula)
25 12 Aug Loutre (Otter)
26 13 Aug Myrte (Myrtle)
27 14 Aug Colza (Rapeseed)
28 15 Aug Lupin (Lupin)
29 16 Aug Coton (Cotton)
30 17 Aug Moulin (Mill)
Fructidor commence le 21 ou 22 août.jpg
Fructidor (18 August – 16 September)
1 18 Aug Prune (Plum)
2 19 Aug Millet (Millet)
3 20 Aug Lycoperdon (Puffball)
4 21 Aug Escourgeon (Six-row Barley)
5 22 Aug Saumon (Salmon)
6 23 Aug Tubéreuse (Tuberose)
7 24 Aug Sucrion (Winter Barley)
8 25 Aug Apocyn (Apocynum)
9 26 Aug Réglisse (Liquorice)
10 27 Aug Échelle (Ladder)
11 28 Aug Pastèque (Watermelon)
12 29 Aug Fenouil (Fennel)
13 30 Aug Épine vinette (Barberry)
14 31 Aug Noix (Walnut)
15 1 Sep Truite (Trout)
16 2 Sep Citron (Lemon)
17 3 Sep Cardère (Teasel)
18 4 Sep Nerprun (Buckthorn)
19 5 Sep Tagette (Mexican Marigold)
20 6 Sep Hotte (Harvesting basket)
21 7 Sep Églantier (Wild Rose)
22 8 Sep Noisette (Hazelnut)
23 9 Sep Houblon (Hops)
24 10 Sep Sorgho (Sorghum)
25 11 Sep Écrevisse (Crayfish)
26 12 Sep Bigarade (Bitter orange)
27 13 Sep Verge d'or (Goldenrod)
28 14 Sep Maïs (Maize or Corn)
29 15 Sep Marron (Sweet Chestnut)
30 16 Sep Panier (Pack Basket)

Complementary days

Five extra days – six in leap years – were national holidays at the end of every year. These were originally known as les sans-culottides (after sans-culottes), but after year III (1795) as les jours complémentaires:

Converting from the Gregorian Calendar

Fountain in Octon, Hérault with date 5 Ventôse an 109 (24 February 1901)

Below are the Gregorian dates each Republican year (an in French) began while the calendar was in effect.

An Gregorian
I (1) 22 September 1792
II (2) 22 September 1793
III (3)* 22 September 1794
IV (4) 23 September 1795
V (5) 22 September 1796
VI (6) 22 September 1797
VII (7)* 22 September 1798
VIII (8) 23 September 1799
IX (9) 23 September 1800
X (10) 23 September 1801
XI (11)* 23 September 1802
XII (12) 24 September 1803
XIII (13) 23 September 1804
XIV (14) 23 September 1805
  • Leap year, extra day added at end of year[13]

The calendar was abolished in the year XIV (1805). After this date, opinions seem to differ on the method by which the leap years would have been determined if the calendar were still in force. There are at least four hypotheses used to convert dates from the Gregorian calendar:

  • The leap years would continue to vary in order to ensure that each year the autumnal equinox in Paris falls on 1 Vendémiaire, as was the case from year I to year XIV. This is the only method that was ever in legal effect, although it means that sometimes five years pass between leap years, such as the years 15 and 20.[14]
  • Leap years would have fallen on each year divisible by four (thus in 20, 24, 28…), except most century years, according to Romme's proposed fixed rules. This would have simplified conversions between the Republican and Gregorian calendars since the Republican leap day would usually follow a few months after 29 February, at the end of each year divisible by four, so that the date of the Republican New Year remains the same (22 September) in the Gregorian calendar for the entire third century of the Republican Era (AD 1992–2091).[15]
  • The leap years would have continued in a fixed rule every four years from the last one (thus years 15, 19, 23, 27…) with the leap day added before, rather than after, each year divisible by four, except most century years. This rule has the advantage that it is both simple to calculate and is continuous with every year in which the calendar was in official use during the First Republic. Some concordances were printed in France, after the Republican Calendar was abandoned, using this rule to determine dates for long-term contracts.[16][17]
  • Beginning with year 20, years divisible by four would be leap years, except for years divisible by 128. Note that this rule was first proposed by von Mädler, and not until the late 19th century. The date of the Republican New Year remains the same (23 September) in the Gregorian calendar every year from 129 to 256 (AD 1920–2047).[18][19][20]

The following table shows when several years of the Republican Era begin on the Gregorian calendar, according to each of the four above methods:

An AD/CE Equinox Romme Continuous 128-Year

XV (15)


23 September*

23 September

23 September*

23 September*

XVI (16)


24 September

23 September*

24 September

24 September

XVII (17)


23 September

23 September

23 September

23 September

XVIII (18)


23 September

23 September

23 September

23 September

XIX (19)


23 September

23 September

23 September*

23 September

XX (20)


23 September*

23 September*

24 September

23 September*

CCXXII (222)


22 September*

22 September

22 September

23 September



23 September

22 September

22 September*

23 September

CCXXIV (224)


23 September

22 September*

23 September

23 September*

CCXXV (225)


22 September

22 September

22 September

23 September

* Leap year, extra day added at end of year

Current date and time

For this calendar, the Romme method of calculating leap years is used. Other methods may differ by one day.

231 Pluviôse CCXXXI
décade 13
1 Friday
20 January 2023
2 Saturday
21 January 2023
3 Sunday
22 January 2023
4 Monday
23 January 2023
5 Tuesday
24 January 2023
6 Wednesday
25 January 2023
7 Thursday
26 January 2023
8 Friday
27 January 2023
9 Saturday
28 January 2023
10 Sunday
29 January 2023
décade 14
11 Monday
30 January 2023
12 Tuesday
31 January 2023
13 Wednesday
1 February 2023
14 Thursday
2 February 2023
15 Friday
3 February 2023
16 Saturday
4 February 2023
17 Sunday
5 February 2023
18 Monday
6 February 2023
19 Tuesday
7 February 2023
20 Wednesday
8 February 2023
décade 15
21 Thursday
9 February 2023
22 Friday
10 February 2023
23 Saturday
11 February 2023
24 Sunday
12 February 2023
25 Monday
13 February 2023
26 Tuesday
14 February 2023
27 Wednesday
15 February 2023
28 Thursday
16 February 2023
29 Friday
17 February 2023
30 Saturday
18 February 2023
10 h
24 h

Criticism and shortcomings

Clock dial displaying both decimal and duodecimal time.

Leap years in the calendar are a point of great dispute, due to the contradicting statements in the establishing decree[21] stating:

Each year begins at midnight, with the day on which the true autumnal equinox falls for the Paris Observatory.


The four-year period, after which the addition of a day is usually necessary, is called the Franciade in memory of the revolution which, after four years of effort, led France to republican government. The fourth year of the Franciade is called Sextile.

These two specifications are incompatible, as leap years defined by the autumnal equinox in Paris do not recur on a regular four year schedule. Thus, the years III, VII, and XI were observed as leap years, and the years XV and XX were also planned as such, even though they were five years apart.

Clock dial displaying both decimal (inside the circle) and duodecimal time (on the outer rim).

A fixed arithmetic rule for determining leap years was proposed in the name of the Committee of Public Education by Gilbert Romme on 19 Floréal An III (8 May 1795). The proposed rule was to determine leap years by applying the rules of the Gregorian calendar to the years of the French Republic (years IV, VIII, XII, etc. were to be leap years) except that year 4000 (the last year of ten 400-year periods) should be a common year instead of a leap year. Because he was shortly after sentenced to the guillotine, this proposal was never adopted and the original astronomical rule continued, which excluded any other fixed arithmetic rule. The proposal was intended to avoid uncertain future leap years caused by the inaccurate astronomical knowledge of the 1790s (even today, this statement is still valid due to the uncertainty in ΔT). In particular, the committee noted that the autumnal equinox of year 144 was predicted to occur at 11:59:40 pm local apparent time in Paris, which was closer to midnight than its inherent 3 to 4 minute uncertainty.

The calendar was abolished by an act dated 22 Fructidor an XIII (9 September 1805) and signed by Napoleon, which referred to a report by Michel-Louis-Étienne Regnaud de Saint-Jean d'Angély and Jean Joseph Mounier, listing two fundamental flaws.

  1. The rule for leap years depended upon the uneven course of the sun, rather than fixed intervals, so that one must consult astronomers to determine when each year started, especially when the equinox happened close to midnight, as the exact moment could not be predicted with certainty.
  2. Both the era and the beginning of the year were chosen to commemorate an historical event which occurred on the first day of autumn in France, whereas the other European nations began the year near the beginning of winter or spring, thus being impediments to the calendar's adoption in Europe and America, and even a part of the French nation, where the Gregorian calendar continued to be used, as it was required for religious purposes.

The report also noted that the 10-day décade was unpopular and had already been suppressed three years earlier in favor of the 7-day week, removing what was considered by some as one of the calendar's main benefits.[22] The 10-day décade was unpopular with laborers because they received only one full day of rest out of ten, instead of one in seven, although they also got a half-day off on the fifth day. It also, by design, conflicted with Sunday religious observances.

Another criticism of the calendar was that despite the poetic names of its months, they are tied to the climate and agriculture of metropolitan France and therefore not applicable to France's overseas territories.[citation needed]

Famous dates in the Republican Calendar and other cultural references

Décret de la Convention 9 Brumaire An III above the entrance to the ENS.

The "18 Brumaire" or "Brumaire" was the coup d'état of Napoleon Bonaparte on 18 Brumaire An VIII (9 November 1799), which many historians consider as the end of the French Revolution. Karl Marx' 1852 essay The 18th Brumaire of Louis Napoléon compares the 1851 coup of Louis Napoléon to his uncle's earlier coup.

Another famous revolutionary date is 9 Thermidor An II (27 July 1794), the date the Convention turned against Robespierre, who, along with others associated with the Mountain, was guillotined the following day. Based on this event, the term "Thermidorian" entered the Marxist vocabulary as referring to revolutionaries who destroy the revolution from the inside and turn against its true aims. For example, Leon Trotsky and his followers used this term about Joseph Stalin.

Émile Zola's novel Germinal takes its name from the calendar's month of Germinal.

The seafood dish lobster thermidor was probably named after the 1891 play Thermidor, set during the Revolution.[23][24]

The French frigates of the Floréal class all bear names of Republican months.

The Convention of 9 Brumaire An III, 30 October 1794, established the École Normale Supérieure. The date appears prominently on the entrance to the school.

The French composer Fromental Halévy was named after the feast day of 'Fromental' in the Revolutionary Calendar, which occurred on his birthday in year VIII (27 May 1799).

Neil Gaiman's The Sandman series, included a story called Thermidor which takes place on that month during the French Revolution.[25]

The Liavek shared world series uses a calendar which is a direct translation of the French Republican calendar.

Sarah Monette's Doctrine of Labyrinths series borrows the Republican calendar for one of the two competing calendars (their usage splits between social classes) in the fictional city of Mélusine.

See also


  1. Sylvain, Maréchal. "Almanach des Honnêtes-gens". Gallica. pp. 14–15.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. James Guillaume, Procès-verbaux du Comité d'instruction publique de la Convention nationale, t. I, pp. 227–228 et t. II, pp. 440–448 ; Michel Froechlé, « Le calendrier républicain correspondait-il à une nécessité scientifique ? », Congrès national des sociétés savantes : scientifiques et sociétés, Paris, 1989, pp. 453–465.
  3. Le calendrier républicain: de sa création à sa disparition. Bureau des longitudes. 1994. p. 19. ISBN 978-2-910015-09-1.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. "Concordat de 1801 Napoleon Bonaparte religion en france Concordat de 1801". 21 November 2007. Retrieved 30 January 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. Le calendrier républicain: de sa création à sa disparition. Bureau des longitudes. 1994. p. 26. ISBN 978-2-910015-09-1.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. Le calendrier républicain: de sa création à sa disparition. Bureau des longitudes. 1994. p. 36. ISBN 978-2-910015-09-1.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. Richard A. Carrigan, Jr. "Decimal Time". American Scientist, (May–June 1978), 66(3): 305–313.
  8. 8.0 8.1 Thomas Carlyle (1867). The French revolution: a history. Harper.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  9. Sporting Magazine, 15, Rogerson and Tuxford, January 1800, p. 210, retrieved 23 December 2014<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  10. Antoine Augustin Renouard (1822). Manuel pour la concordance des calendriers républicain et grégorien (2 ed.). A. A. Renouard. Retrieved 14 September 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  11. Ed. Terwecoren (1870). Collection de Précis historiques. J. Vandereydt. p. 31.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  12. Philippe-Joseph-Benjamin Buchez, Prosper Charles Roux (1837). Histoire parlementaire de la révolution française. Paulin. p. 415.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  13. Parise, Frank (2002). The Book of Calendars. Gorgias Press. p. 376. ISBN 9781931956765.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  14. Sébastien Louis Rosaz (1810). Concordance de l'Annuaire de la République française avec le calendrier grégorien.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  15. "Brumaire – Calendrier Républicain". Retrieved 30 January 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  16. Antoine Augustin Renouard (1822). Manuel pour la concordance des calendriers républicain et grégorien: ou, Recueil complet de tous les annuaires depuis la première année républicaine (2 ed.). A. A. Renouard.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  17. "Brumaire – Calendrier Républicain". Retrieved 30 January 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  18. The French Revolution Calendar
  19. "Calendars". Retrieved 30 January 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  20. "The French Revolutionary Calendar , Calendars". Retrieved 30 January 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  21. "Le Calendrier Republicain". Retrieved 30 January 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  22. Antoine Augustin Renouard (1822). Manuel pour la concordance des calendriers républicain et grégorien: ou, Recueil complet de tous les annuaires depuis la première année républicaine (2 ed.). A. A. Renouard. p. 217.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  23. James, Kenneth (15 November 2006). Escoffier: The King of Chefs. Continuum International Publishing Group. p. 44. ISBN 978-1-85285-526-0. Retrieved 11 March 2012.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  24. "Lobster thermidor". Online Dictionary. Merriam-Webster. Retrieved 11 March 2012.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  25. Gaiman, Neil (w), Woch, Stan (p), Giordano, Nick (i), Vozzo, Daniel (col), Klein, Todd (let), Berger, Karen (ed). "Thermidor" The Sandman v29, (August 1991), Vertigo Comics

Further reading

  • Ozouf, Mona, 'Revolutionary Calendar' in Furet, François and Mona Ozouf, eds., Critical Dictionary of the French Revolution (1989)
  • Shaw, Matthew, Time and the French Revolution: a history of the French Republican Calendar, 1789-Year XIV (2011)

External links