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Work · March 13, 2022

French Republican Calendar based on equinoxes

An interactive French Republican Calendar (a.k.a. French Revolutionary Calendar) that uses the original equinox method and never drifts out of sync with the seasons, along with revolutionary decimal time.

French Republican Calendar based on equinoxes launched on March 13, 2022 with 50 votes, #975 of 3,153 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 4 years on.

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In plain words

The French Republican Calendar based on equinoxes is a work tool that implements the historical French Revolutionary calendar system, recalculated using astronomical equinox events rather than fixed dates. It helps users convert between the Gregorian calendar and this alternative calendar system. The tool is designed for historians, calendar enthusiasts, and anyone interested in exploring alternative timekeeping methods rooted in astronomical observation and French history.

written from the facts on this page · September 2026

From the sources

The French Republican calendar was a calendar created and implemented during the French Revolution. It is also frequently referred to as the French Revolutionary Calendar , but this is a misnomer: year 1 of the calendar started on 22 September 1792, the day after the abolition of the monarchy and the founding of the French First Republic . A year consists of 12 months of 30 days each, divided into three décades of 10 days each, followed by 5 complementary days (6 in leap years). The year starts on the day of the autumnal equinox at the Paris Observatory (longitude 2°20′14.03″ E). A leap year follow directly from this definition: a year is a leap year when the next autumnal equinox happens…from frcal.qt.ax

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