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Once in a lifetime they said…
(lemmy.nz)
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this post was submitted on 17 Sep 2026
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Doesn't need to be 64 bit to be unsigned... And the system clock generally only goes up, so no need to represent system time as earlier than 1970...
If you want computers to not have an arbitrary line in the sand when referring to the past, you need to be able to do calculations with time from before the epoch, that's why it needs to be signed.
Off the top of my head, working out the age of someone born before 1970 is going to be a calculation that happens countless times a day
You generally don't need the precision of seconds for that sort of calculation however, so can use a signed int representing date rather than datetime for that.