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General: FRENCH REVOLUTIONARY (DECIMAL) TIME 10 HOUR DAY 100 MINUTES=1 HOUR 100 SECONDS=1
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Réponse  Message 1 de 22 de ce thème 
De: BARILOCHENSE6999  (message original) Envoyé: 29/03/2025 16:40

FRENCH REVOLUTIONARY (DECIMAL) TIME

Everybody knows that there are 24 hours in a day, 60 minutes in an hour, and 60 seconds in minute. But in 1793, the French smashed the old clock system in favor of French Revolutionary Time, which was a 10-hour day, with 100 minutes per hour, and 100 seconds per minute. This thoroughly modern system had a few practical benefits, chief among them being a simplified way to do time-related math. If we want to know when a day is 80% complete, decimal time simply says "at the end of the eighth hour," whereas standard time requires us to say "at 19 hours, 12 minutes." French Revolutionary Time was a more elegant solution to that math problem. The problem was that every living person already had a well-established way of telling the time, and old habits die hard!

French Revolutionary Time clocksFrench Revolutionary Time officially began on November 24, 1793 although conceptual work around the system had been going on since the 1750s. The French manufactured clocks and watches showing both decimal time and standard time on their faces (allowing for both conversion and confusion). These clock faces were spectacularly weird.

French Revolutionary Time clock
The system proved unpopular. People were unfamiliar with switching systems of time, and there were few practical reasons for non-mathematicians to change how they told time. (The same could not be said of the metric system of weights and measurements, which helped to standardize commerce; weights and measurements often differed in neighboring countries, but clocks generally did not.) Furthermore, replacing every clock and watch in the country was an expensive proposition. The French officially stopped using decimal time after just 17 months. French Revolutionary Time became non-mandatory starting on April 7, 1795. This didn't stop some areas of the country from continuing to observe decimal time, and a few decimal clocks remained in use for years afterwards, presumably leading to many missed appointments!

 

LIVE NORMAL AND DECIMAL TIME

Live NORMAL time

Live DECIMAL time

 

DECIMAL TO NORMAL / NORMAL TO DECIMAL TIME CONVERTER

Enter decimall time:

Use HH:MM:SS format

Result in "normal" time:

Enter "normal" time:

Use HH:MM:SS format

Result in decimall time:



Some applications using decimal time are available in both Google Play and the Apple Store. For example, for Android - DecimalTime ; for Apple - DeciTime .


 

LOOK/PURCHASE SVALBARD DECIMAL TIME WATCHES

 


 

https://svalbard.watch/pages/about_decimal_time.html


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Réponse  Message 8 de 22 de ce thème 
De: BARILOCHENSE6999 Envoyé: 31/03/2025 03:21

I don’t know if it’s a right answer but I think it’s because the numerical system used was/is decimal

Known in the west as arabic number (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) but originated from India it’s a decimal system (ten symbols)

and the vast majority of human numerical system is decimal.

I guess that’s why.

But yes the base 12 system would have been interesting (not only for measurment but priorly for mathematics)

divider in decimal system 2 and 5

divider in 12 system 3, 2 and 2 again

https://www.quora.com/In-1793-decimal-time-was-tried-in-the-French-Revolution-10-hr-day-x-100-min-hr-x-100-sec-min-instead-of-24-x-60-x-60-Why-was-decimal-time-unsuccessful-after-1795

Réponse  Message 9 de 22 de ce thème 
De: BARILOCHENSE6999 Envoyé: 31/03/2025 03:27
French Revolutionary Time clock

Réponse  Message 10 de 22 de ce thème 
De: BARILOCHENSE6999 Envoyé: 31/03/2025 03:32

Decimal Time: How the French Made a 10-Hour Day

 
ByChris Higgins|Jan 5, 2013
This decimal clock was made by Pierre Daniel Destigny in Rouen, France, between 1798 and 1805.
This decimal clock was made by Pierre Daniel Destigny in Rouen, France, between 1798 and 1805. | DeFacto, Wikimedia Commons // CC BY-SA 4.0

Everybody knows that there are 24 hours in a day, 60 minutes in an hour, and 60 seconds in minute.* But in 1793, the French smashed the old clock in favor of French Revolutionary Time: a 10-hour day, with 100 minutes per hour, and 100 seconds per minute. This thoroughly modern system had a few practical benefits, chief among them being a simplified way to do time-related math: if we want to know when a day is 70 percent complete, decimal time simply says "at the end of the seventh hour," whereas standard time requires us to say "at 16 hours, 48 minutes." French Revolutionary Time was a more elegant solution to that math problem. The trick was that every living person already had a well-established way to tell time, and old habits die hard.

Noon is at Five in Decimal Time

French Revolutionary Time officially began on November 24, 1793, although conceptual work around the system had been going on since the 1750s. The French manufactured clocks and watches showing both decimal time and standard time on their faces (allowing for conversion and confusion).

The system proved unpopular. People were unfamiliar with switching systems of time, and there were few practical reasons for non-mathematicians to change how they told time. (The same could not be said of the metric system of weights and measurements, which helped to standardize commerce; weights and measurements often differed in neighboring countries, but clocks generally did not.) Furthermore, replacing every clock and watch in the country was a spendy proposition. The French officially stopped using decimal time after just 17 months: French Revolutionary Time became non-mandatory starting on April 7, 1795. This didn't stop some areas of the country from continuing to observe decimal time, and a few decimal clocks remained in use for years afterwards, presumably leading to many missed appointments.

Other Attempts at Decimal Time

The French Republican Calendar was another attempt by revolutionary France to decimalize everything. It wasn't particularly successful.

The French tried again in 1897, when the Commission de Décimalisation du Temps proposed a 24-hour day with 100-minute hours, again with 100 seconds per minute. This proposal was scrapped in 1900.

And then, of course, there's the Stardate, a pseudo-decimal system of date measurement used in Star Trek. Unsurprisingly, the Stardate started out being supremely imprecise and was just supposed to sound futuristic; here's a snippet from the Star Trek Guide for teleplay writers on the original series:

"Pick any combination of four numbers plus a percentage point, use it as your story's stardate. For example, 1313.5 is twelve o'clock noon of one day and 1314.5 would be noon of the next day. Each percentage point is roughly equivalent to one-tenth of one day."

And lest we forget Swiss watchmakers in all of this, Swatch introduced their own bizarre decimal time system in 1998. Called Swatch Internet Time, it divided the day into ".beats" (yes, with a dot) and referred to a particular .beat using the @ symbol (so you might say, "ICQ me at @484 so we can swap some beenz, LOL!"). Each .beat lasted 1 minute and 26.4 seconds and represented 1/1000 of a day. Nope, not confusing @all.

* = There are actually several exceptions to the 24/60/60 rule, most notably leap seconds, but let's keep it simple.

A version of this story ran in 2013; it has been updated for 2021.

https://www.mentalfloss.com/article/32127/decimal-time-how-french-made-10-hour-day

Réponse  Message 11 de 22 de ce thème 
De: BARILOCHENSE6999 Envoyé: 31/03/2025 04:02

France had a calendar with 10-hour days during the revolution.

 
 
  • 10-HOUR DECIMAL CLOCK
 

French Revolutionary Time was a short-lived concept that used a base-10 timekeeping system. Otherwise known as “decimal time,” this unprecedented method included 10-hour days, 100 minutes per hour, and 100 seconds per minute. Each day was divided into 10 equal parts, with “zero” marking the start (what is now midnight) and “five” denoting the midpoint (noon). This meant that every hour was more than twice as long as an hour of standard time. New clocks and watches were even manufactured displaying both decimal time and standard time, to considerable confusion. 

 

While France formally adopted this practice on November 24, 1793, the idea was first promoted in 1754. That year, mathematician Jean le Rond d’Alembert drew inspiration from the base-10 numeral system that had existed since ancient times and argued that it would be easier and more convenient to calculate times that were divisible by 10. The concept was revived in 1788 and met with enthusiasm from French revolutionaries seeking to shed their ties to the past. French Revolutionary Time was later adopted by the French Parliament, though it proved to be unpopular among citizens who found the switch confusing. The new system was deemed optional on April 7, 1795, and the country ultimately reverted to the previous timekeeping method.

In addition to changing how the country kept time, revolutionary France also adopted the French Republican calendar. The new formula divided the year into 12 months, each of which contained three 10-day weeks. To bring the total days up to 365, France tacked on five additional days at the end of the year as holidays. Debuted on October 24, 1793, the new calendar was also short-lived, and was abolished by Napoleon Bonaparte on January 1, 1806.

You may also like

https://historyfacts.com/world-history/fact/france-had-a-calendar-with-10-hour-days-during-the-revolution/

Réponse  Message 12 de 22 de ce thème 
De: BARILOCHENSE6999 Envoyé: 24/06/2025 19:28


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