The 2018c release of the tz code and data is available. It follows on
the 2018a and 2018b releases, which were published but were not
announced until now, due to problems discovered late in their release
processes. 2018a had a build-failure typo, and 2018a and 2018b both had
problems with ICU and Java, downstream packages which do not support a
feature (negative DST offsets) used in 2018a and 2018b. The typo has
been fixed, and data changes using negative DST offsets have been
reverted pending development of a mechanism to export data to platforms
lacking support for such data.
The 2018a through 2018c releases reflect the following changes, which
were either circulated on the tz mailing list or are relatively minor
technical or administrative changes. This announcement has merged the
set of changes made by the three releases, to make it easier to see the
difference between 2017c and 2018c; please see the 2018c NEWS file for
more details about intermediate versions.
Release 2018c - 2018-01-22 23:00:44 -0800
Release 2018b - 2018-01-17 23:24:48 -0800
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.
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
Japanese DST transitions (1948-1951) were Sundays at 00:00, not
Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
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 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.)
The build procedure now works around mawk 1.3.3's lack of support
for character class expressions. (Problem reported by Ohyama.)
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.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2018c.tar.gzhttps://www.iana.org/time-zones/repository/releases/tzdata2018c.tar.gzhttps://www.iana.org/time-zones/repository/releases/tzdb-2018c.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
fromftp://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
ef4db72f1cbe1f7141f8aa012a624abb0a8d8059 dated 2018-01-22 23:00:44 -0800
and tagged '2018c' 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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tzcode2018c.tar.gz
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