tzdata 2020b

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tzdata 2020b

Brian Inglis
The following package has been updated in the Cygwin distribution:

* tzdata 2020b

The Time Zone Database (often called tz, tzdb, or zoneinfo) contains
data that represents the history of local time for many regions around
the world.
It is updated periodically to reflect changes made by political bodies
to daylight saving (summer time) rules, UTC offsets, and time zone
boundaries.

News for the tz database

Release 2020b - 2020-10-06 18:35:04 -0700

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.

For more details, see the announcement or below:

https://mm.icann.org/pipermail/tz-announce/2020-October/000059.html

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 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 and systemv have been removed from
the distribution.  (Thanks to Tim Parenti.)