[Bug time/31558] New: mktime wildly mishandles times near Pacific/Apia tz discontinuity

["bugdal at aerifal dot cx" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31558

            Bug ID: 31558
           Summary: mktime wildly mishandles times near Pacific/Apia tz
                    discontinuity
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: bugdal at aerifal dot cx
  Target Milestone: ---

Given tm_year=2011-1900, tm_mon=12-1, tm_mday=31, all other fields 0, and
TZ=Pacific/Apia, glibc mktime produces an output of 2012-01-01 01:00:00 (time_t
1325329200), offset a whole day forward from what it should be. The affected
input is not even a time in the omitted day (2011-12-30 does not exist in this
zone) but 1 hour into the following day, which exists. The problem seems to be
related to how tm_isdst=0 is being applied - DST is active at this time - but
with or without it applied, the time never falls into the limbo day.

Discovered as part of a monster thread about the topic of this zone transition
on the musl libc mailing list.

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