[baddox]

Sure, but for every example there is a perfect mirror example. Say you're on a phone call with your uncle Steve in Melbourne. At the end of the call, Steven says he will call you back at 18:30 tomorrow. If there was one global time zone, you wouldn't need to do any time conversion to know when to expect the call.

[golangnews]

That’s what I meant by It would simplify a lot of coordination though, I agree zones don’t help this sort of question, if anything they hinder.

Main problem with getting rid of zones are day boundaries and people getting used to a 24 hour clock and arbitrary hours ( even the proposer here used am and pm!), so days would start at odd hours - at least the term noon would be a lot more accurate :) It would seem odd for Saturday say to start at 23:00 in some places though.