Also, think of how deleterious the abolition of local time would have on communication. Right now I can say something like "I received an urgent call at 3am" and you know immediately what that means. But if I said "I received an urgent call at 17:00Z", a lot of the meaning is lost. You'd have to know where I live, i.e. what my local time zone is, and then do some quick mental math to determine what actual time of day 17:00Z means for me. With local time, that calculation is already done for you! Local time is just too damn useful of a concept. It really truly is better than global time for most uses. Global time is really only useful for scheduling global meetings and computer stuff.
[Well], think of how deleterious the abolition of [global] time would have on communication. Right now I can say something like "I received an urgent call at [17:00Z]" and you know immediately what that means [in reference to everything else happening in the world]. But if I said "I received an urgent call at [3am]", a lot of the meaning is lost. You'd have to know where I live, i.e. what my local time zone is, [where the caller is] and then do some [potentially complicated] math to determine what actual time 3am means. With [global] time, that calculation is already done for you! [Global] time is just too damn useful of a concept. It really truly is better than [local] time for most uses. [Local] time is really only useful for scheduling [local] meetings and [in-person] stuff.