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by TheCoelacanth 3379 days ago
Seconds since Epoch is always unambiguous, but you can't always unambiguously convert a time to seconds since Epoch. If I set my alarm clock to 7 AM while I am in EST and you save that as 11 AM UTC, then I travel to somewhere that is in CST that 7 AM is now 12 PM UTC and the time you saved is now wrong.