In theory POSIX is based on UTC. In practice, since UTC has leap seconds,
and POSIX does not, POSIX is not based on UTC.
Could you be more specific?
There is no "in theory" since POSIX is a practical specification. The
specification says time_t is based on UTC. POSIX time has
never been a constant offset from TAI. What has been said many times is that it
might be nice to change POSIX time to be based
on TAI but if you try it you find that this breaks most timekeeping code.
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