A
Arne Vajhøj
UNIX had 32 bit time variables, hence its epoch was tiny: 68 years
(1970-2038). This is the shortest date range of any OS I've used.
Fortunately its since been upgraded to 64 bits, so the UNIX epoch will
now outlast the universe with a healthy margin for error.
I don't think UNIX specify its size.
Many Unix'es has changed from 32 to 64 bit.
Arne