2020.4: Release of tzdata 2020d

Version 2020.4

Upstream version 2020d released 2020-10-21T18:24:13+00:00

Briefly:

Palestine ends DST earlier than predicted, on 2020-10-24.

Changes to past and future timestamps

Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 as previously
predicted (thanks to Sharef Mustafa.) Its 2019-10-26 fall-back was at 00:00,
not 01:00 (thanks to Steffen Thorsen.) Its 2015-10-23 transition was at 01:00
not 00:00, and its spring 2020 transition was on March 28 at 00:00, not March 27
(thanks to Pierre Cashon.) This affects Asia/Gaza and Asia/Hebron. Assume
future spring and fall transitions will be on the Saturday preceding the last
Sunday of March and October, respectively.

2020.3: Release of tzdata 2020c

Relevant portion of the upstream changelog:

Release 2020c - 2020-10-16 11:15:53 -0700

Briefly:

Fiji starts DST later than usual, on 2020-12-20.

Changes to future timestamps

Fiji will start DST on 2020-12-20, instead of 2020-11-08 as
previously predicted. DST will still end on 2021-01-17.
(Thanks to Raymond Kumar and Alan Mintz.) Assume for now that
the later-than-usual start date is a one-time departure from the
recent pattern.

2020.2: Release of tzdata 2020b

Upstream changelog contents (only the data-related aspects of this apply):

Release notes are:

Briefly:
Revised predictions for Morocco's changes starting in 2023.
Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08.
Macquarie Island has stayed in sync with Tasmania since 2011.
Casey, Antarctica is at +08 in winter and +11 in summer.
zic no longer supports -y, nor the TYPE field of Rules.

Changes to future timestamps

Morocco's spring-forward after Ramadan is now predicted to occur
no sooner than two days after Ramadan, instead of one day.
(Thanks to Milamber.)  The first altered prediction is for 2023,
now predicted to spring-forward on April 30 instead of April 23.

Changes to past and future timestamps

Casey Station, Antarctica has been using +08 in winter and +11 in
summer since 2018. The most recent transition from +08 to +11 was
2020-10-04 00:01. Also, Macquarie Island has been staying in
sync with Tasmania since 2011. (Thanks to Steffen Thorsen.)

Changes to past and future time zone abbreviations and DST flags

Canada's Yukon, represented by America/Whitehorse and
America/Dawson, changes its time zone rules from -08/-07 to
permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it.
This change affects only the time zone abbreviation (MST vs PDT)
and daylight saving flag for the period between the two dates.
(Thanks to Andrew G. Smith.)

Changes to past timestamps

Correct several transitions for Hungary for 1918/1983.
For example, the 1983-09-25 fall-back was at 01:00, not 03:00.
(Thanks to Géza Nyáry.)  Also, the 1890 transition to standard
time was on 11-01, not 10-01 (thanks to Michael Deckers).

The 1891 French transition was on March 16, not March 15.  The
1911-03-11 French transition was at midnight, not a minute later.
Monaco's transitions were on 1892-06-01 and 1911-03-29, not
1891-03-15 and 1911-03-11.  (Thanks to Michael Deckers.)

Changes to code

Support for zic's long-obsolete '-y YEARISTYPE' option has been
removed and, with it, so has support for the TYPE field in Rule
lines, which is now reserved for compatibility with earlier zic.
These features were previously deprecated in release 2015f.
(Thanks to Tim Parenti.)

zic now defaults to '-b slim' instead of to '-b fat'.

zic's new '-l -' and '-p -' options uninstall any existing
localtime and posixrules files, respectively.

The undocumented and ineffective tzsetwall function has been
removed.

Changes to build procedure

The Makefile now defaults POSIXRULES to '-', so the posixrules
feature (obsolete as of 2019b) is no longer installed by default.

Changes to documentation and commentary

The long-obsolete files pacificnew, systemv, and yearistype.sh have
been removed from the distribution.  (Thanks to Tim Parenti.)

2020.1: Release of tzdata 2020a

This release includes the IANA database version 2020a. It does not include the posix/ and right/ subdirectories.

2020.1rc1: Release Candidate 1 for 2020a

This release removes the posixrules zone.

2020.1rc0: Release Candidate 0 for 2020a

First release candidate for the 2020a IANA time zone data.