[ascar]

I don't think we should abolish time zones, but he isn't making good points.

His points are based on conventions that exist because we use local time zones and he uses a lot of English centric bias in his argument.

His first point of am/pm is already a bad start considering a 24h clock is simply advantageous and used throughout most of the world.

Finding out if he can call his uncle would be as easy as looking up daylight times instead of time offsets/local times. And even then the cultural conventions of your country might not map to his and it was still inappropriate to call.

The problem with business hours and overlapping days is entirely made up, because he wants to stick to previous conventions that worked well with local time. If a night club opens Saturday from 19:00 to 05:00 it's perfectly clear that means it's open till Sunday 05:00. It would work similarly for business hours. The regular business hours also differ vastly in different cultures and jobs! The day name is of course UTC based and wraps at 00:00UTC.

I play an international online game that wraps days at 00:00UTC and we communicate in UTC. If I say Wednesday 14:00 UTC it's perfectly clear what that means and you get used to that very quickly. If we would change the system the next generation would grow up with that system and it would be natural. And I find it much easier to remember that my Korean friends are available from 23:00 UTC till 16:00 UTC than to remember what time it is there right now compared to here, because that requires mental math or a lookup.