Version 2020.5

Upstream version 2020e released 2020-12-22T23:14:34+00:00

Briefly:

Volgograd switches to Moscow time on 2020-12-27 at 02:00.

Changes to future timestamps

Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. (Thanks to
Alexander Krivenyshev and Stepan Golosunov.)

Changes to past timestamps

Correct many pre-1986 transitions, fixing entries originally derived from
Shanks. The fixes include:

• Australia: several 1917 through 1971 transitions
• Bahamas: several 1941 through 1945 transitions
• Bermuda: several 1917 through 1956 transitions
• Belize: several 1942 through 1968 transitions
• Ghana: several 1915 through 1956 transitions
• Israel and Palestine: several 1940 through 1985 transitions
• Kenya and adjacent: several 1908 through 1960 transitions
• Nigeria and adjacent: correcting LMT in Lagos, and several 1905 through 1919 transitions
• Seychelles: the introduction of standard time in 1907, not 1906
• Vanuatu: DST in 1973-1974, and a corrected 1984 transition

(Thanks to P Chan.)

Because of the Australia change, Australia/Currie (King Island) is no longer
needed, as it is identical to Australia/Hobart for all timestamps since 1970 and
was therefore created by mistake. Australia/Currie has been moved to the
'backward' file and its corrected data moved to the 'backzone' file.

Changes to past time zone abbreviations and DST flags

To better match legislation in Turks and Caicos, the 2015 shift to year-round
observance of -04 is now modeled as AST throughout before returning to Eastern
Time with US DST in 2018, rather than as maintaining EDT until 2015-11-01.
(Thanks to P Chan.)

Changes to documentation

The zic man page now documents zic's coalescing of transitions when a zone falls
back just before DST springs forward.