All they do is complicate things.
In today's society where communication is easier across long distances, we should have a set Earth time.
In each respective area, people will learn what time the sun rises and what time it sets.
Communication and correlation over long distances would be simpler, and keeping track of world events would also be easier.
Agree or no?
-
So everyone on the other side of the earth should to sleep at 7:00 o clock am when I'm just waking up? No.