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On 04/30/2014 12:31 PM, Rich Felker wrote:
having gmtime return different results based on the TZ variable is non-conforming.
glibc gmtime doesn't return different results. Only localtime is affected: it throws in leap seconds if you set TZ appropriately. In this case gmtime is returning TAI, not the POSIX approximation to UTC.
Anyway, this is not a POSIX conformance issue, as POSIX does not constrain gmtime's behavior when the user sets TZ to a value outside the POSIX range.
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