tree 34d91036da7ad8fb03ac87f6d61c81a0535f45a8
parent c06c1eb6610b478a06df8116aefc975f376760f8
author A. Wilcox <AWilcox@Wilcox-Tech.com> 1535411840 -0500
committer Rich Felker <dalias@aerifal.cx> 1535414156 -0400

time: fix incorrect DST offset when using POSIX timezones without DST

This manifests itself in mktime if tm_isdst = 1 and the current TZ= is
a POSIX timezone specification. mktime would see that tm_isdst was set
to 0 by __secs_to_zone, and subtract 'oppoff' (dst_off) - gmtoff from
the resultant time. This meant that mktime returned a time that was
exactly double the GMT offset of the desired timezone when tm_isdst
was = 1.