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  1. JDK
  2. JDK-8203233

(tz) Upgrade time-zone data to tzdata2018e

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    • Resolved In Build:
      b16

      Backports

        Description

        [Fri May 4 00:22:20 UTC 2018]

        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.gz
        https://www.iana.org/time-zones/repository/releases/tzdata2018e.tar.gz
        https://www.iana.org/time-zones/repository/releases/tzdb-2018e.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.

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                • Assignee:
                  rpatil Ramanand Patil
                  Reporter:
                  rpatil Ramanand Patil
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