[Bug libc/22639] New: year 2039 bug for localtime etc. on 64-bit platforms

["eggert at gnu dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22639

            Bug ID: 22639
           Summary: year 2039 bug for localtime etc. on 64-bit platforms
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: eggert at gnu dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 10697
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10697&action=edit
Demonstrate the Y2039 bug in glibc localtime

On 64-bit platforms, localtime and related functions work correctly in the year
2039 (the first full year after a 32-bit time_t would overflow), but they stop
working in March 2039.

The attached program illustrates the bug. It uses US Pacific time rules, and
should output this:

2039-04-30 14:00:00 PDT

because DST should be observed in April 2039. However, it incorrectly outputs
this:

2039-04-30 13:00:00 PST

The same bug occurs if one sets TZ=America/Los_Angeles in the putenv call. The
bug appears to affect all years starting in 2039.

This bug was first reported on the tz mailing list by user Random832 here:

https://mm.icann.org/pipermail/tz/2017-December/025795.html

I observed the bug on Fedora 27 x86-64.

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