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US/Canada time zones if they were not adjusted for political boundaries
(files.catbox.moe)
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So timezones.
The difference is that you're not changing how time is kept. Countries can change their timezone offsets right now to screwy things like +12:45 and it changes how time is recorded and stored. If we switch to UTC, a country can just declare their official hours are shifting and nobody has to fundamentally change how clocks work.