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It’s not just time zones and leap seconds. SI seconds on Earth are slower because of relativity, so there are time standards for space stuff (TCB, TGC) that use faster SI seconds than UTC/Unix time. T2 - T1 = [God doesn’t know and the Devil isn’t telling.]
Obligatory “Falsehoods programmers believe about time”
Thank you, but I gave up halfway through the list.
I got to “The day before Saturday is always Friday” and I was like waaaa?