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Nothing is so extremely rare that the empire wouldn’t have it. Arguing Palpatine wouldn’t have heard of it seems like a dead end. You can maybe argue palps wouldn’t give the separatists something that useful, but his dedicated jedi hunters would have had it.
Eliminating time zones doesn’t make scheduling meetings easier it just changes the language. Instead of figuring out what time it is elsewhere you have to remember what normal working hours are, Europe, US, and Japan aren’t all going to be available 9-5 UTC. It’s just as easy to suggest a meeting at functionally midnight without time zones.