On 12/09/2017 11:11 AM, Paul Eggert wrote: > POSIX requires support for UT offsets ranging from -24:00 to 24:59:59 Whoops, wrong value. POSIX actually allows UT offsets from -24:59:59 to 24:59:59, so POSIX daylight-saving and standard time can differ by almost 50 hours in either direction.