The 2019a release of the tz code and data is available. It reflects the
following changes, which were either circulated on the tz mailing list or are
relatively minor technical or administrative changes:
Briefly:
Palestine "springs forward" on 2019-03-30 instead of 2019-03-23.
Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00.
Changes to past and future timestamps
Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as
previously predicted. Adjust our prediction by guessing that spring
transitions will be between 24 and 30 March, which matches recent practice
since 2016. (Thanks to Even Scharning and Tim Parenti.)
Metlakatla ended its observance of Pacific standard time,
rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan
Stanley and Tim Parenti.)
Changes to past timestamps
Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25).
(Thanks to Alois Treindl and Isaac Starkman.)
Changes to time zone abbreviations
Etc/UCT is now a backward-compatibility link to Etc/UTC, instead
of being a separate zone that generates the abbreviation "UCT",
which nowadays is typically a typo. (Problem reported by Isiah
Meadows.)
Changes to code
zic now has an -r option to limit the time range of output data.
For example, 'zic -r @1000000000' limits the output data to
timestamps starting 1000000000 seconds after the Epoch.
This helps shrink output size and can be useful for applications
not needing the full timestamp history, such as TZDIST truncation;
see Internet RFC 8536 section 5.1. (Inspired by a feature request
from Christopher Wong, helped along by bug reports from Wong and
from Tim Parenti.)
Changes to documentation
Mention Internet RFC 8536 (February 2019), which documents TZif.
tz-link.html now cites tzdata-meta
<https://tzdata-meta.timtimeonline.com/>.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2019a.tar.gzhttps://www.iana.org/time-zones/repository/releases/tzdata2019a.tar.gzhttps://www.iana.org/time-zones/repository/releases/tzdb-2019a.tar.lz
As usual, links to the latest release files are here:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gzhttps://www.iana.org/time-zones/repository/tzdata-latest.tar.gzhttps://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by appending
".asc" to the above URLs. Copies of these signatures are appended to this message.
This release corresponds to commit 14c73382cf95efd5f189379427b7b37ca22b9eff
dated 2019-03-25 22:01:33 -0700 and tagged '2019a' in the development GitHub
repository at <https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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PS. If your tzdata parser does not yet support negative DST offsets,
this particular release's data entries are also available in a
rearguard-format tarball and signature that does not contain such
offsets. This is intended to be a temporary transition aid for these
parsers. The URLs are:
https://web.cs.ucla.edu/~eggert/tz/release/2019a/tzdata2019a-rearguard.tar.…https://web.cs.ucla.edu/~eggert/tz/release/2019a/tzdata2019a-rearguard.tar.…
with the following SHA-512 and GPG checksums:
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tzdata2019a-rearguard.tar.gz
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