Why isn't 'time' part of the metric system and why don't we make it metric?

I like moving the decimal place in metric system. It’s easy. But noooo. Whoever came up with the day, hour, and minute didn’t take into account the ease of converting one into the other.

Can anyone tell me, offhand, how many minutes are in 2 years? Well, if we implement my version of metric time: 10 minutes in an hour, 100 minutes in a day, 1000 minutes in a month, and 10000 minutes in a year; so the answer would be 20000 minutes.

Of course there are many logistics and kinks and scientific measurements to be made, but would time be a good thing to make metric?