The French Revolution introduced lots of new ideas, some of them lasting in our days. However their calendar reform was not among them. It lasted only for twelve years.
The French Republican Calendar (French: calendrier républicain français) or 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 decimalization in France (which also included decimal time of day, decimalization of currency, and metrication). To make the calendar popular a commemorative medal was issued. On the obverse of the bronze medal the start epoch was stated, written in seven lines: "ÉRE FRANCAISE COMMENCÉE A L'ÉQUINOXE D'AUTOMN. 22 SEPT. 1792 9 HEURES 18 MIN. 30 S DU MATIN. A PARIS" (French era has begun at the autumn equinox, September 22, 1792 9h 18m 30 s in the morning in Paris). Above the legend the part of the zodiac, centering with the Scorpion is visible. The Sun is placed in the Libra.
The reverse shows the allegoric figure of France. Legend above is: "REPUBLIQUE UNE ET INDIVISIBLE", below: "NATION FRANCAISE".