The French were really into decimalization for a while. They tried decimal time (10 decimal hours per day, each 100 decimal minutes, each 100 decimal seconds),

The French were really into decimalization for a while. They tried decimal time (10 decimal hours per day, each 100 decimal minutes, each 100 decimal seconds), and a new calendar with equal 30-day months (the extra days at the end were national holidays, in September in the Gregorian calendar). Also 10-day 'décades' instead of weeks.