When the metric system was defined and adopted during the French revolution they changed the calendar as well.
Months were changed to be 30 days each with an extra 5-6 days at the end of the year, weeks were 10 days long, days were 10 hours of 100 minutes, each minute lasted 100 seconds.
Unfortunately it did not stick and the decimal time system was reverted.
When the metric system was defined and adopted during the French revolution they changed the calendar as well.
Months were changed to be 30 days each with an extra 5-6 days at the end of the year, weeks were 10 days long, days were 10 hours of 100 minutes, each minute lasted 100 seconds.
Unfortunately it did not stick and the decimal time system was reverted.