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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”
I really wish that list would include some explanations about why each line is a falsehood, and what’s actually true. Particularly the line:
If the author has proof that some software will run on a space ship that is orbiting a black hole, I’d be really interested in seeing it.
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?
This one is good (or evil, depends on how you see it):
That one’s really good.
Which one is it?
And is it 2011/2005 or rather 1911/1905, 1811/1805,…?