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

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.

Ratings and Reviews

4.0 out of 5
1 Rating

1 Rating

Emax3729 ,

Needs update please!

Hi developer! Could you please update this app to suit the newest updates, I.e. increase the clarity/resolution of the app?

Victorianbelle ,

Fun but needs to be expanded

This is a fun app, especially since I teach world history. I would give it a much higher rating if i could convert dates before 1992. I want to look up birthdays and significant dates in history.

Mongolianmonkey ,

Good start, but needs improvement

The first page, with the date and the decimal time is fine.

The problem is with the Dédicaces page. It always defaults back to the same page, the first day of the year. Thus to see the symbol for a day, you first have to select the date, than click Done. This is inefficient, time-consuming, frustrating and unnecessarily cumbersome.

The fix should make it possible to easily move from one Dédicace to another, forward or backwards, by swiping the screen left or right. Many apps use this swiping feature to move forward and backwards.

By the way, the pictures and texts on the Dédicace pages are excellent and informative!

Just fix the navigation, please.

Update October 11, 2013.

On my iPhone 3GS, the app worked fine insofar as showing each day in real time was concerned But yesterday, I traded in my 3GS for a 5C and now this app (1) doesn't work at all--it's stuck on the same day, 19 vendémiaire, and (2) it now looks really ugly because they they stupidly removed the beautiful picture form the original Republican calendar.

Please fix this app! I use it [or, rather, I WANT to use it] every day!



Jose Luis Martin Mas
207.9 MB

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



Age Rating
Rated 4+
© 2014 Kawasemi Corp. José Luis Martín Mas


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