vendor/tzdata/tzdata2020a

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 News for the tz database
 
+Release 2020a - 2020-04-23 16:03:47 -0700
+
+  Briefly:
+    Morocco springs forward on 2020-05-31, not 2020-05-24.
+    Canada's Yukon advanced to -07 year-round on 2020-03-08.
+    America/Nuuk renamed from America/Godthab.
+    zic now supports expiration dates for leap second lists.
+
+  Changes to future timestamps
+
+    Morocco's second spring-forward transition in 2020 will be May 31,
+    not May 24 as predicted earlier.  (Thanks to Semlali Naoufal.)
+    Adjust future-year predictions to use the first Sunday after the
+    day after Ramadan, not the first Sunday after Ramadan.
+
+    Canada's Yukon, represented by America/Whitehorse and
+    America/Dawson, advanced to -07 year-round, beginning with its
+    spring-forward transition on 2020-03-08, and will not fall back on
+    2020-11-01.  Although a government press release calls this
+    "permanent Pacific Daylight Saving Time", we prefer MST for
+    consistency with nearby Dawson Creek, Creston, and Fort Nelson.
+    (Thanks to Tim Parenti.)
+
+  Changes to past timestamps
+
+    Shanghai observed DST in 1919.  (Thanks to Phake Nick.)
+
+  Changes to timezone identifiers
+
+    To reflect current usage in English better, America/Godthab has
+    been renamed to America/Nuuk.  A backwards-compatibility link
+    remains for the old name.
+
+  Changes to code
+
+    localtime.c no longer mishandles timestamps after the last
+    transition in a TZif file with leap seconds and with daylight
+    saving time transitions projected into the indefinite future.
+    For example, with TZ='America/Los_Angeles' with leap seconds,
+    zdump formerly reported a DST transition on 2038-03-14
+    from 01:59:32.999... to 02:59:33 instead of the correct transition
+    from 01:59:59.999... to 03:00:00.
+
+    zic -L now supports an Expires line in the leapseconds file, and
+    truncates the TZif output accordingly.  This propagates leap
+    second expiration information into the TZif file, and avoids the
+    abovementioned localtime.c bug as well as similar bugs present in
+    many client implementations.  If no Expires line is present, zic
+    -L instead truncates the TZif output based on the #expires comment
+    present in leapseconds files distributed by tzdb 2018f and later;
+    however, this usage is obsolescent.  For now, the distributed
+    leapseconds file has an Expires line that is commented out, so
+    that the file can be fed to older versions of zic which ignore the
+    commented-out line.  Future tzdb distributions are planned to
+    contain a leapseconds file with an Expires line.
+
+    The configuration macros HAVE_TZNAME and USG_COMPAT should now be
+    set to 1 if the system library supports the feature, and 2 if not.
+    As before, these macros are nonzero if tzcode should support the
+    feature, zero otherwise.
+
+    The configuration macro ALTZONE now has the same values with the
+    same meaning as HAVE_TZNAME and USG_COMPAT.
+
+    The code's defense against CRLF in leap-seconds.list is now
+    portable to POSIX awk.  (Problem reported by Deborah Goldsmith.)
+
+    Although the undocumented tzsetwall function is not changed in
+    this release, it is now deprecated in preparation for removal in
+    future releases.  Due to POSIX requirements, tzsetwall has not
+    worked for some time.  Any code that uses it should instead use
+    tzalloc(NULL) or, if portability trumps thread-safety, should
+    unset the TZ environment variable.
+
+  Changes to commentary
+
+    The Îles-de-la-Madeleine and the Listuguj reserve are noted as
+    following America/Halifax, and comments about Yukon's "south" and
+    "north" have been corrected to say "east" and "west".  (Thanks to
+    Jeffery Nichols.)
+
+
 Release 2019c - 2019-09-11 08:59:48 -0700
 
   Briefly: