The 2018e 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:
North Korea switches back to +09 on 2018-05-05.
The main format uses negative DST again, for Ireland etc.
'make tarballs' now also builds a rearguard tarball.
New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
Changes to past and future time stamps
North Korea switches back from +0830 to +09 on 2018-05-05.
(Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
and Tim Parenti.)
Bring back the negative-DST changes of 2018a, except be more
compatible with data parsers that do not support negative DST.
Also, this now affects historical time stamps in Namibia and the
former Czechoslovakia, not just Ireland. The main format now uses
negative DST to model time stamps in Europe/Dublin (from 1971 on),
Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This
does not affect UT offsets, only time zone abbreviations and the
tm_isdst flag. Also, this does not affect rearguard or vanguard
formats; effectively the main format now uses vanguard instead of
rearguard format. Data parsers that do not support negative DST
can still use data from the rearguard tarball described below.
Changes to build procedure
The command 'make tarballs' now also builds the tarball
tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
except that it uses rearguard format intended for trailing-edge
data parsers.
Changes to data format and to code
The SAVE column of Rule and Zone lines can now have an 's' or 'd'
suffix, which specifies whether the adjusted time is standard time
or daylight saving time. If no suffix is given, daylight saving
time is used if and only if the SAVE column is nonzero; this is
the longstanding behavior. Although this new feature is not used
in tzdata, it could be used to specify the legal time in Namibia
1994-2017, as opposed to the popular time (see below).
Changes to past time stamps
From 1994 through 2017 Namibia observed DST in winter, not summer.
That is, it used negative DST, as Ireland still does. This change
does not affect UTC offsets; it affects only the tm_isdst flag and
the abbreviation used during summer, which is now CAT, not WAST.
Although (as noted by Michael Deckers) summer and winter time were
both simply called "standard time" in Namibian law, in common
practice winter time was considered to be DST (as noted by Stephen
Colebourne). The full effect of this change is only in vanguard
format; in rearguard and main format, the tm_isdst flag is still
zero in winter and nonzero in summer.
In 1946/7 Czechoslovakia also observed negative DST in winter.
The full effect of this change is only in vanguard format; in
rearguard and main formats, it is modeled as plain GMT without
daylight saving. Also, the dates of some 1944/5 DST transitions
in Czechoslovakia have been changed.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2018e.tar.gzhttps://www.iana.org/time-zones/repository/releases/tzdata2018e.tar.gzhttps://www.iana.org/time-zones/repository/releases/tzdb-2018e.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
4758e88f99c71af65d73ce730e87438466032a5f dated 2018-05-01 23:42:51 -0700
and tagged '2018e' 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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tzcode2018e.tar.gz
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tzdata2018e.tar.gz
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tzdb-2018e.tar.lz
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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
arearguard-format tarball and signature that does not contain
suchoffsets. This is intended to be a temporary transition aid for
theseparsers. The URLs are:
https://web.cs.ucla.edu/~eggert/tz/release/2018e/tzdata2018e-rearguard.tar.…https://web.cs.ucla.edu/~eggert/tz/release/2018e/tzdata2018e-rearguard.tar.…
with the following SHA-512 and GPG checksums:
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tzdata2018e-rearguard.tar.gz
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