Comment on Epoch fail!!!

ChaoticNeutralCzech@feddit.org ⁨2⁩ ⁨months⁩ ago

• saigot@lemmy.ca ⁨2⁩ ⁨months⁩ ago

  If the calendar was written in C++ or many of it’s derivatives then signed integer overflow is undefined behaviour and it could technically choose to do anything it damn well wants (unsigned integers actually do have defined overflow behaviour). Something tells me the runtime of a paper calendar is anything but standard :D

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• Zoomboingding@lemmy.world ⁨2⁩ ⁨months⁩ ago

  It’s not the overflow that’s the issue, but a calculation failure that causes the date value to be “0” and thus list the date as January 1, 1970. It’s happened to me several times with Pokemon GO.

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  • jaybone@lemmy.world ⁨2⁩ ⁨months⁩ ago

    Fuck the specs. If Pokemon GO says it, that’s good enough for me.

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  • ChaoticNeutralCzech@feddit.org ⁨2⁩ ⁨months⁩ ago

    In this case, it’s the overflow as 01111111…11111111+1 in binary becomes 10000000…00000000.

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    But yes, some programs erroneously fall back to 0 in case of a null value, which corresponds to 1970-01-01. That’s why so many geotags exist for Null Island.

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    • Matty_r@programming.dev ⁨2⁩ ⁨months⁩ ago

      For those wanting to know why, its called Two’s complement

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• observantTrapezium@lemmy.ca ⁨2⁩ ⁨months⁩ ago

  Haha, that’s right. Immediate noticed that.

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