Tracking time is entirely a human construct

There's no reason we can use a Universal clock for the whole planet. Technically we have that UTC or Universal Time, also called Greenwich Mean Time or GMT.

The problem is that people base their day on the time. Noon is when the sun is the highest, you go to work for 8am, etc

If you use Universal time noon would be in the evening in North America and people don't like that. Which is why timezones exist.

Timezones are kinda, not really, but mostly just lines drawn on a map that says "for this area the clock will be X hours ahead or behind GMT so that noon is when the sun is directly overhead"