Martin Panter added the comment:
The problem is probably triggered by the test in test_imaplib which sets the
timezone to “STD-1DST”. It was added in revision 42b9d9d795f7, in 2012 for
Python 3.3 only, which explains why we don’t have any trouble with Python 2.
I am no expert on time zone settings, but this either looks like a bug or
unfortunate quirk in the C library. I only have the Gnu library handy to play
with at the moment. Using my demo C program, it looks like tzset() fails to
update tzname if both (1) New York time is set rather than UTC and (2) the
temporary TZ value did not include DST rules:
$ sudo timedatectl status # Note UTC time zone
Local time: Sun 2015-11-15 00:16:54 UTC
Universal time: Sun 2015-11-15 00:16:54 UTC
RTC time: Sun 2015-11-15 00:16:54
Time zone: UTC (UTC, +0000)
Network time on: no
NTP synchronized: no
RTC in local TZ: no
$ sudo timedatectl set-timezone America/New_York
$ ./tz-quirk "STD-1DST"
Initially: TZ=<unset> tzname={"GMT", "GMT"}
After tzset(): TZ=<unset> tzname={"EST", "EDT"}
Set TZ: TZ="STD-1DST" tzname={"STD", "DST"}
Unset TZ: TZ=<unset> tzname={"STD", "DST"}
If you include DST rules in the TZ value, the problem does not occur. Maybe
this could be a good enough workaround:
$ ./tz-quirk "STD-1DST,M3.2.0,M11.1.0"
Initially: TZ=<unset> tzname={"GMT", "GMT"}
After tzset(): TZ=<unset> tzname={"EST", "EDT"}
Set TZ: TZ="STD-1DST,M3.2.0,M11.1.0" tzname={"STD", "DST"}
Unset TZ: TZ=<unset> tzname={"EST", "EDT"}
$ sudo timedatectl set-timezone UTC # Restore my setting
$ pacman -Qo /lib/libc.so.6
/usr/lib/libc.so.6 is owned by glibc 2.22-3
----------
components: +Tests
nosy: +martin.panter
title: TarFile.list() outputs wrong time -> test_datetime, test_tarfile,
test_strptime time zone failures
versions: +Python 3.6
Added file: http://bugs.python.org/file41046/tz-quirk.c
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20220>
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