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How did the French republican calendar change the length of the week?
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French Revolution
The execution of Louis XVI in 1793.
The French republican calendar, adopted in 1793, replaced the traditional seven-day week with a 10-day period known as a décade.123
This change was intended to create a more rational, secular system that would eliminate Christian associations, specifically by "swallowing up" the traditional Sunday in a new cycle of work and recreation. Under this system, each month consisted of 30 days, divided into three décades, with the final day of each 10-day period serving as a designated rest day.132