Commits on Nov 3, 2019

1. Fix test_tzlocal_offset_equal[GMT-tzoff1] …

   test_tzlocal_offset_equal[GMT-tzoff1] fails if a system does not
   have a defined (installed) GMT timezone, for example if "Link Etc/GMT GMT"
   is not defined in the zoneinfo configuration:
   
   >           assert tz.tzlocal() == tzoff
   E           AssertionError: assert tzlocal() == tzoffset(u'GMT', 0)
   E             -tzlocal()
   E             +tzoffset(u'GMT', 0)
   
   An example of such a configuration is FreeBSD, who's default timezone is
   UTC [1][2]. This configuration results in any "non-present" or undefined TZ
   name being returned/processed as the default timezone name (in FreeBSD's
   case, UTC).
   
   Further, POSIX does not recognize [3] TZ=GMT or TZ=UTC as valid values
   because they neither start with a colon nor contain a numeric offset hour
   field.
   
   Accordingly, update the GMT value for this parametrized test to GMT0, a
   specific (not aliased) timezone, making it more robust to system
   configuration differences.
   
   [1] https://svnweb.freebsd.org/changeset/base/130332
   [2] https://svnweb.freebsd.org/changeset/base/199405
   [3] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html

   

   koobs authored and pganssle committed Nov 3, 2019
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