1 files changed, 154 insertions, 12 deletions

diff --git a/contrib/tzdata/NEWS b/contrib/tzdata/NEWS
index bd2bec223a0b..2bd0aa84143f 100644
--- a/contrib/tzdata/NEWS
+++ b/contrib/tzdata/NEWS
@@ -1,5 +1,147 @@
 News for the tz database
 
+Release 2018c - 2018-01-22 23:00:44 -0800
+
+  Briefly:
+  Revert Irish changes that relied on negative DST offsets.
+
+  Changes to tm_isdst
+
+    Revert the 2018a change to Europe/Dublin.  As before, this change
+    does not affect UT offsets or abbreviations; it affects only
+    whether timestamps are considered to be standard time or
+    daylight-saving time, as expressed in the tm_isdst flag of C's
+    struct tm type.  This reversion is intended to be a temporary
+    workaround for problems discovered with downstream uses of
+    releases 2018a and 2018b, which implemented Irish time by using
+    negative DST offsets in the Eire rules of the 'europe' file.
+    Although negative DST offsets have been part of tzcode for many
+    years and are supported by many platforms, they were not
+    documented before 2018a and ICU and OpenJDK do not currently
+    support them.  A mechanism to export data to platforms lacking
+    support for negative DST is planned to be developed before the
+    change is reapplied.  (Problems reported by Deborah Goldsmith and
+    Stephen Colebourne.)
+
+  Changes to past time stamps
+
+    Japanese DST transitions (1948-1951) were Sundays at 00:00, not
+    Saturdays or Sundays at 02:00.  (Thanks to Takayuki Nikai.)
+
+  Changes to build procedure
+
+    The build procedure now works around mawk 1.3.3's lack of support
+    for character class expressions.  (Problem reported by Ohyama.)
+
+
+Release 2018b - 2018-01-17 23:24:48 -0800
+
+  Briefly:
+  Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
+
+  Changes to build procedure
+
+    The distribution now contains the file 'pacificnew' again.
+    This file was inadvertantly omitted in the 2018a distribution.
+    (Problem reported by Matias Fonzo.)
+
+
+Release 2018a - 2018-01-12 22:29:21 -0800
+
+  Briefly:
+  São Tomé and Príncipe switched from +00 to +01.
+  Brazil's DST will now start on November's first Sunday.
+  Ireland's standard time is now in the summer, not the winter.
+  Use Debian-style installation locations, instead of 4.3BSD-style.
+  New zic option -t.
+
+  Changes to past and future time stamps
+
+    São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
+    01:00.  (Thanks to Steffen Thorsen and Michael Deckers.)
+
+  Changes to future time stamps
+
+    Starting in 2018 southern Brazil will begin DST on November's
+    first Sunday instead of October's third Sunday.  (Thanks to
+    Steffen Thorsen.)
+
+  Changes to past time stamps
+
+    A discrepancy of 4 s in timestamps before 1931 in South Sudan has
+    been corrected.  The 'backzone' and 'zone.tab' files did not agree
+    with the 'africa' and 'zone1970.tab' files.  (Problem reported by
+    Michael Deckers.)
+
+    The abbreviation invented for Bolivia Summer Time (1931-2) is now
+    BST instead of BOST, to be more consistent with the convention
+    used for Latvian Summer Time (1918-9) and for British Summer Time.
+
+  Changes to tm_isdst
+
+    Change Europe/Dublin so that it observes Irish Standard Time (UT
+    +01) in summer and GMT (as negative daylight-saving) in winter,
+    instead of observing standard time (GMT) in winter and Irish
+    Summer Time (UT +01) in summer.  This change does not affect UT
+    offsets or abbreviations; it affects only whether timestamps are
+    considered to be standard time or daylight-saving time, as
+    expressed in the tm_isdst flag of C's struct tm type.
+    (Discrepancy noted by Derick Rethans.)
+
+  Changes to build procedure
+
+    The default installation locations have been changed to mostly
+    match Debian circa 2017, instead of being designed as an add-on to
+    4.3BSD circa 1986.  This affects the Makefile macros TOPDIR,
+    TZDIR, MANDIR, and LIBDIR.  New Makefile macros TZDEFAULT, USRDIR,
+    USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
+    locations more precisely.  (This responds to suggestions from
+    Brian Inglis and from Steve Summit.)
+
+    The default installation procedure no longer creates the
+    backward-compatibility link US/Pacific-New, which causes
+    confusion during user setup (e.g., see Debian bug 815200).
+    Use 'make BACKWARD="backward pacificnew"' to create the link
+    anyway, for now.  Eventually we plan to remove the link entirely.
+
+    tzdata.zi now contains a version-number comment.
+    (Suggested by Tom Lane.)
+
+    The Makefile now quotes values like BACKWARD more carefully when
+    passing them to the shell.  (Problem reported by Zefram.)
+
+    Builders no longer need to specify -DHAVE_SNPRINTF on platforms
+    that have snprintf and use pre-C99 compilers.  (Problem reported
+    by Jon Skeet.)
+
+  Changes to code
+
+    zic has a new option -t FILE that specifies the location of the
+    file that determines local time when TZ is unset.  The default for
+    this location can be configured via the new TZDEFAULT makefile
+    macro, which defaults to /etc/localtime.
+
+    Diagnostics and commentary now distinguish UT from UTC more
+    carefully; see theory.html for more information about UT vs UTC.
+
+    zic has been ported to GCC 8's -Wstringop-truncation option.
+    (Problem reported by Martin Sebor.)
+
+  Changes to documentation and commentary
+
+    The zic man page now documents the longstanding behavior that
+    times and years can be out of the usual range, with negative times
+    counting backwards from midnight and with year 0 preceding year 1.
+    (Problem reported by Michael Deckers.)
+
+    The theory.html file now mentions the POSIX limit of six chars
+    per abbreviation, and lists alphabetic abbreviations used.
+
+    The files tz-art.htm and tz-link.htm have been renamed to
+    tz-art.html and tz-link.html, respectively, for consistency with
+    other file names and to simplify web server configuration.
+
+
 Release 2017c - 2017-10-20 14:49:34 -0700
 
   Briefly:
@@ -895,8 +1037,8 @@ Release 2015f - 2015-08-10 18:06:56 -0700
     (Thanks to Jon Skeet and Arthur David Olson.)  Constraints on
     simultaneity are now documented.
 
-    The two characters '%z' in a zone format now stand for the UTC
-    offset, e.g., '-07' for seven hours behind UTC and '+0530' for
+    The two characters '%z' in a zone format now stand for the UT
+    offset, e.g., '-07' for seven hours behind UT and '+0530' for
     five hours and thirty minutes ahead.  This better supports time
     zone abbreviations conforming to POSIX.1-2001 and later.
 
@@ -1019,13 +1161,13 @@ Release 2015c - 2015-04-11 08:55:55 -0700
       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,
+      Assume no UT 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.
+    this change affects UT 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.
 
@@ -1055,7 +1197,7 @@ Release 2015b - 2015-03-19 23:28:11 -0700
 
     Some more zones have been turned into links, when they differed
     from existing zones only for older time stamps.  As usual,
-    these changes affect UTC offsets in pre-1970 time stamps only.
+    these changes affect UT offsets in pre-1970 time stamps only.
     Their old contents have been moved to the 'backzone' file.
     The affected zones are: America/Antigua, America/Cayman,
     Pacific/Midway, and Pacific/Saipan.
@@ -1107,7 +1249,7 @@ Release 2015a - 2015-01-29 22:35:20 -0800
 
     Some more zones have been turned into links, when they differed
     from existing zones only for older time stamps.  As usual,
-    these changes affect UTC offsets in pre-1970 time stamps only.
+    these changes affect UT offsets in pre-1970 time stamps only.
     Their old contents have been moved to the 'backzone' file.
     The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
     and Asia/Muscat.
@@ -1154,7 +1296,7 @@ Release 2014j - 2014-11-10 17:37:11 -0800
 
     Some more zones have been turned into links, when they differed
     from existing zones only for older time stamps.  As usual,
-    these changes affect UTC offsets in pre-1970 time stamps only.
+    these changes affect UT offsets in pre-1970 time stamps only.
     Their old contents have been moved to the 'backzone' file.
     The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
     Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
@@ -1244,7 +1386,7 @@ Release 2014h - 2014-09-25 18:59:03 -0700
 
     Some more zones have been turned into links, when they differed
     from existing zones only for older timestamps.  As usual,
-    these changes affect UTC offsets in pre-1970 timestamps only.
+    these changes affect UT offsets in pre-1970 timestamps only.
     Their old contents have been moved to the 'backzone' file.
     The affected zones are: Africa/Blantyre, Africa/Bujumbura,
     Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
@@ -1329,7 +1471,7 @@ Release 2014g - 2014-08-28 12:31:23 -0700
 
     Some more zones have been turned into links, when they differed
     from existing zones only for older timestamps.  As usual,
-    these changes affect UTC offsets in pre-1970 timestamps only.
+    these changes affect UT offsets in pre-1970 timestamps only.
     Their old contents have been moved to the 'backzone' file.
     The affected zones are: Africa/Bangui, Africa/Brazzaville,
     Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
@@ -1479,7 +1621,7 @@ Release 2014f - 2014-08-05 17:42:36 -0700
     standard and daylight saving time the abbreviations are AEST and AEDT
     instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
     and AWST/AWDT are now used instead of the former CST, CWST, and WST.
-    This change does not affect UTC offsets, only time zone abbreviations.
+    This change does not affect UT offsets, only time zone abbreviations.
     (Thanks to Rich Tibbett and many others.)
 
     Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
@@ -1516,8 +1658,8 @@ Release 2014f - 2014-08-05 17:42:36 -0700
     Treindl sent helpful translations of two papers by Guo Qingsheng.)
 
     Some zones have been turned into links, when they differed from existing
-    zones only for older UTC offsets where data entries were likely invented.
-    These changes affect UTC offsets in pre-1970 timestamps only.  This is
+    zones only for older UT offsets where data entries were likely invented.
+    These changes affect UT offsets in pre-1970 timestamps only.  This is
     similar to the change in release 2013e, except this time for western
     Africa.  The affected zones are: Africa/Bamako, Africa/Banjul,
     Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,