I think time zones are actually pretty useful. If I have to call Frankfurt or Tokyo, it makes a big difference whether it's 4pm their time or 6pm. If things we

I think time zones are actually pretty useful. If I have to call Frankfurt or Tokyo, it makes a big difference whether it's 4pm their time or 6pm. If things were the same worldwide then I'd have no idea if it's the middle of the night in the place I'm trying to call unless I've already memorized it. With time zones I can just look at a world clock.