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Calendrier- French Revolution Calendar

By Kawasemi Corp. (Jose Luis Martin Mas)

This app is only available on the App Store for iOS devices.


Calendrier- French Revolution Calendar shows today's date in the French Revolution Calendar, as well as the current decimal time.

On 24th October 1793 the Convention adopted in France a new calendar based on a decimal system. It had been designed during that year by the Committee of Public Instruction with the objective of introducing a rational organization in the calendar. The structure and rules of the calendar were defined by the politician Charles Gilbert Romme. The poet Fabre d'Énglantine invented the names of the months.

The calendar consisted of 12 months of 30 days each, with 5 extra days (6 in a leap year) to match the solar year. Instead of seven-days weeks, the months were divided on three ten-days weeks called décades.

Parallel to this, the National Convention also decided to reform the time measures with an easier an rational decimal time. Each day was divided in 10 hours, so that the fifth hour was noon, and the tenth was midnight. Each hour had 100 decimal minutes, and each decimal minute, 100 decimal seconds.

Unfortunately, the weight of tradition and custom was heavier than these reforms. The decimal time was only used officially for six months, and the calendar, for three years. Now with Calendrier, you can enjoy that great idea on your iPhone and your iPad.

- Show's today's date in the French Revolution Calendar, and the decimal time.
- Full conversion of Gregorian dates to Republican dates from Gregorian year 1792 to 2195 using the Equinoctal Rule (Republican year starts at the date of the Autumn equinox in Paris).
- Dédicaces. [ dedikas ]. When the poet Fabre d'Églantine made his report with the proposal for the names of the months, he also made another interesting proposal full of the educational spirit of the Enlightenment: assigning to each day of the year a plant, an animal or an agricultural tool so that every citizen would be able to learn something of the rural economy. Fabre d'Églantine never gave a name to this concept, so we've decided to used the French word "Dédicace" ("commemoration") to name it. Calendrier includes a section where you will be able to find out which was the dédicace of each day of the calendar, with a picture of the plant, animal or tool, its name, and a few brief lines about it.

Tab bar icons by Joseph Wain /

What's New in Version 2.51

- Fixed interface bugs.
- Today widget. We've added a widget to the app so that you can see what decimal time it is and open the app from there.
- Holidays. We've got recently on our hands J. Le Boyer's 1822 work "Traité Complet du Calendrier", that, among a huge collection of calendars of every place and time, it includes a detailed explanation of the French Revolution Calendar. This work has made us discover that the French Revolution Calendar had a holiday at the end of each décade (that is, days 10, 20 and 30 of each month). We've added these holidays to the Today tab of the app.
- New illustrations. We've managed to replace most (but not all) of the dedicaces images that were contemporary photos for illustrations of the XVIIIth and XIXth centuries.
- Several bug fixes related to sans-culottides and the refresh of views.


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iPad Screenshot 1
Calendrier- French Revolution Calendar
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This app is designed for both iPhone and iPad
  • $1.99
  • Category: Reference
  • Updated:
  • Version: 2.51
  • Size: 208 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.

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