Edit: Today I learned that UTC is an actual real thing and not just a setting I scroll past on my computer 😅.
They also complicate things.
It made more sense back before we had electric lighting and when everyone lived by the rising and setting of the sun. Now it doesn’t seem to really matter.
Obviously, the whole world deciding where to start the time would be nigh impossible but it could be like: starting at this date, on the first day of the year, what ever point is farthest away from the sun is 00:00 from henceforth.
And then people just adapted to what that meant for their particular area. Somebody’s morning might be 13:00!
Imagine if the whole world was on some global time schedule.
Edit: From my comment below
Look at the earth from a top down perspective. It’s a pie. With 12 or 24 slices depending on the granularity. A clock, basically. It would take the same amount of energy to learn which slice of earth is lined up towards the sun for each hour as would be to learn anything else in elementary school.
After which, for the rest of your life you’d have an intuitive grasp of where earth is in its rotation and what “time” it would be for any place in the world.
Oh, you’re talking about solar time? Yeah, that gets messy when every 1 second slice of the planet is essentially a small time zone.
Anyway, I was just thinking of having a single universal time. When scheduling meetings, everyone would just need to tell what time window is ideal and what’s tolerable. Just like nowadays, you would still need to look at a meeting planner to figure it which time that works for everyone.