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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug time/29951] New: daylight variable not set correctly if last
 DST change coincides with offset change
Date: Mon, 02 Jan 2023 09:51:37 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: time
X-Bugzilla-Version: 2.37
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: fweimer at redhat dot com
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29951

            Bug ID: 29951
           Summary: daylight variable not set correctly if last DST change
                    coincides with offset change
           Product: glibc
           Version: 2.37
            Status: NEW
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---

The daylight variable is supposed to be set to 1 if DST is every in use for=
 the
current time zone. But __tzfile_read does this:

  __daylight =3D rule_stdoff !=3D rule_dstoff;

This check can fail to set __daylight to 1 if the DST and non-DST offsets
happen to be the same.

The current tz data for Africa/Tripoli exposes this bug.

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