On 5/23/22 04:48, Almaz Mingaleev wrote:
> I think overflow happens somewhere.
> Please see the attached code.

That test doesn't look right, as each mktime call modifies its argument,
polluting the next test case. Please try the attached test instead,
ported to C. On my platform (Ubuntu 22.04, x86-64) this outputs:

sizeof time_t: 8
2120284800
2120256000
4076812800
4076784000

which looks OK.