That's pretty cool! The French actually had a decimal time system after the revolution, but they eventually abandoned it.

Okay but now you have to tell us how it works!

The history of the calendar in Roman times is actually an entire topic to itself.

The pre-Julian calendar required fine tuning every year in winter to keep the rest of the months aligned with the seasons.

Technically not a difficult job to keep the calendar running smoothly and consistently, but the person in charge of the calendar in Rome was a politician, so they would play political games with the length of the year.

Caesar wanted a calendar that would run on auto-pilot to strip power away from those politicians.

By sheer coincidence when Caesar made his reform, during the the changeover of calendars while he was in charge, he got to rule over a 400+ day long year.

We should have a base 12 metric system but the French already established the 10

There is a fun fun sci-fi book called "Deepness in the Sky" by Vernor Vinge. The Humans use epoch time with si prefixed Seconds for time,

It came from the Sumerians, not the Greeks.

One benefit of base 12 and base 60 over base 10 for everyday use with things like time is simple factorization. You can divide 12 hours evenly into halves, thirds, quarters, and sixths, and 60 minutes evenly into halves, thirds, quarters, fifths, sixths, tenths, etc. With base 10, you've just got halves and fifths.

Because base ten sucks for practical use and anything that needs division.

Some people briefly tried that during the French Revolution, but it never caught on.

It was called the French Republican Calendar. Didn’t last very long.

https://en.m.wikipedia.org/wiki/French_Republican_calendar

https://en.wikipedia.org/wiki/Decimal_time?wprov=sfla1

The French tried at the same time they adopted the rest of the metric system but it just didnt offer much advantage vs changing out clocks.

With digital clocks it would be simpler now.

Yeah that didn't fly at all ..

A slow clock might not be right in your entire lifetime.

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Military plus all of mainland Europe

Time zones are kind of useful though.