I thought the Unix time thing was 2106 in the case of bitcoin due to an extra bit being used?
Discussion
Yes. The timestamp is unsigned 32 bit. So we get ~4.3 billion seconds since Jan 1970 unix time epoch. This lands us in 2106 (2106-02-07 06:28:15). At which time the value can overflow, which would cause mined blocks to be invalid as they'd be reporting a timestamp not allowed per median of recent blocks being well in the future.
Othet systems globally also need updates.
Presumably we'd fork to using a 64 bit time in the block.
most timestamps i know of use signed integers so they are half the distance between that date and midnight january 1 1970
sometime about 2038
yes i think that bitcoin uses unsigned unix timestamps, that is what is in my memory too, i recall reading code that has extra handling for it