Please remember that the curvature of this map is off, accurate would be a globe map. Its not that wild, EU has a common time zone because its better for business.
CET gang needs to start annexing neighbors until the whole world is CET red :D.
But for real, time of day is just numbers, it needn't be that eg 5:00 has to mean morning hours (as is it changes every day a bit bcs of Earths tilt + it changes with longitude and latitude even within the same arbitrary timezone).
If we have 'world clock tech' then let's have one world time. I'll still be late whatever the case.