They actually tried to introduce decimal time[1], as well as a decimal week[2]. They didn't stick though.

If you are interested on the topic of the history of the metric system, check out The Measure of All Things[3], an absolutely fantastic read

[1] https://en.wikipedia.org/wiki/Decimal_time

[2] https://en.wikipedia.org/wiki/French_Republican_Calendar

[3] https://www.amazon.com/Measure-All-Things-Seven-Year-Transfo...