[tz-announce] 2015c release of tz code and data available

April 14, 2015

      The 2015c 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.  Although this release is 
based on the best information we had when it was made, the daylight-saving 
situation in Egypt seems to be fluid, and we may need to generate another 
release soon.

   Changes affecting future time stamps

     Egypt's spring-forward transition is at 24:00 on April's last Thursday,
     not 00:00 on April's last Friday.  2015's transition will therefore be on
     Thursday, April 30 at 24:00, not Friday, April 24 at 00:00.  Similar fixes
     apply to 2026, 2037, 2043, etc.  (Thanks to Steffen Thorsen.)

   Changes affecting past time stamps

     The following changes affect some pre-1991 Chile-related time stamps
     in America/Santiago, Antarctica/Palmer, and Pacific/Easter.

       The 1910 transition was January 10, not January 1.

       The 1918 transition was September 10, not September 1.

       The UTC-4 time observed from 1932 to 1942 is now considered to be
       standard time, not year-round DST.

       Santiago observed DST (UTC-3) from 1946-07-15 through 1946-08-31,
       then reverted to standard time, then switched its time zone to
       UTC-5 on 1947-04-01.

       Assume transitions before 1968 were at 00:00, since we have no data
       saying otherwise.

       The spring 1988 transition was 1988-10-09, not 1988-10-02.
       The fall 1990 transition was 1990-03-11, not 1990-03-18.

       Assume no UTC offset change for Pacific/Easter on 1890-01-01,
       and omit all transitions on Pacific/Easter from 1942 through 1946
       since we have no data suggesting that they existed.

     One more zone has been turned into a link, as it differed
     from an existing zone only for older time stamps.  As usual,
     this change affects UTC offsets in pre-1970 time stamps only.
     The zone's old contents have been moved to the 'backzone' file.
     The affected zone is America/Montreal.

   Changes affecting commentary

     Mention the TZUpdater tool.

     Mention "The Time Now".  (Thanks to Brandon Ramsey.)

Here are links to the release files:

   ftp://ftp.iana.org/tz/releases/tzcode2015c.tar.gz
   ftp://ftp.iana.org/tz/releases/tzdata2015c.tar.gz

The files are also available via HTTP as follows:

   http://www.iana.org/time-zones/repository/releases/tzcode2015c.tar.gz
   http://www.iana.org/time-zones/repository/releases/tzdata2015c.tar.gz

As usual, links to the latest release files are here:

   http://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
   http://www.iana.org/time-zones/repository/tzdata-latest.tar.gz

   ftp://ftp.iana.org/tz/tzcode-latest.tar.gz
   ftp://ftp.iana.org/tz/tzdata-latest.tar.gz

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 14ef987885fc4355ab03450cca48bb4fad31f957 
dated Sat Apr 11 08:55:55 2015 -0700 and tagged '2015c' in the experimental 
github repository at <https://github.com/eggert/tz>.

Here are the SHA-512 checksums for the release files:

01f57e27c1031434e7da8876f30084dfef9dbe36988539c857f71f86c0ab1995f82c9fe5dad32ded12185c53433b7f1a0553d8848a2d97529981021ffd70dfb1 
  tzcode2015c.tar.gz
ca89c2041c8420e7b154660e227211b60ba20e8d70b6870b5c0a149838c588d13065202b1266c59caf22a99df2387da95ac04049b9ecb7939cd406c7f007a73e 
  tzdata2015c.tar.gz

Here are the GPG checksums for the release files:

Paul Eggert

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