Changes to future time stamps

  Turkey switched from EET/EEST (+02/+03) to permanent +03,
  effective 2016-09-07.  (Thanks to Burak AYDIN.)  Use "+03" rather
  than an invented abbreviation for the new time.

  New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
  (Thanks to Tim Parenti.)

Changes to past time stamps

  For America/Los_Angeles, spring-forward transition times have been
  corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
  1950-1966.

  For zones using Soviet time on 1919-07-01, transitions to UT-based
  time were at 00:00 UT, not at 02:00 local time.  The affected
  zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
  Europe/Ulyanovsk.  (Thanks to Alexander Belopolsky.)

Changes to past and future time zone abbreviations

  The Factory zone now uses the time zone abbreviation -00 instead
  of a long English-language string, as -00 is now the normal way to
  represent an undefined time zone.

  Several zones in Antarctica and the former Soviet Union, along
  with zones intended for ships at sea that cannot use POSIX TZ
  strings, now use numeric time zone abbreviations instead of
  invented or obsolete alphanumeric abbreviations.  The affected
  zones are Antarctica/Casey, Antarctica/Davis,
  Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
  Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
  Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
  Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
  Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
  Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
  Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
  Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
  Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
  Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
  Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
  Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
  Europe/Minsk, Europe/Samara, Europe/Volgograd, and
  Indian/Kerguelen.  For Europe/Moscow the invented abbreviation MSM
  was replaced by +05, whereas MSK and MSD were kept as they are not
  our invention and are widely used.

Changes to zone names

  Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
  (Thanks to David Massoud.)