It would make it harder to figure out what time of day it is for someone else. If you want to call someone in Australia now, you add or subtract however many hours and the number you come up with will tell you what time of day it is for them. If it were the same time there as here, though. You would have to figure out what time of day 14:00 means in Australia, even though it's also 14:00 here. Time zones make the calculation easier, as 14:00 is in the afternoon everywhere, even though it doesn't all happen at the same time.
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