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US/Canada time zones if they were not adjusted for political boundaries
(files.catbox.moe)
For the map enthused!
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"i will call you tomorrow" already does not define a time period. And nothing is stopping Noon from being a local time, its just that your noon in Hawaii would be UTC -10. So saying I will call you tomorrow afternoon still means I am calling in the later half of the day even in global UTC. You are just defining it with a local reference.
Currently if I want to call someone in Japan, or Australia I already cant say I will call you tomorrow afternoon, because its already tomorrow when I get up.
Yes, but these kind of long distance calls affect only a handful of people. A best before date on a food packaging or a lot of other situations where only the day is given from a date would become more complex for a lot of places, and they would affect the life of far more people.