I know what you’re getting at 😆

Decilitre is actually the common unit for drinks in Hungary (and possibly in other countries). Hungarians also use dekagramm, which is 10 grams. But the cool thing about metric is that to convert, you just move the decimal around!

The French actually tried it, here’s the Wikipedia article.

A more reasonable thing to do is something like Swatch Internet Time, you get 1000 “.beats” in a day with no time zones. Beyond a day it might not be too helpful to keep decimal, there will be 365+fraction days a year no matter how you measure it.