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January 2018

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2018c release of tz code and data available
by Paul Eggert Jan. 23, 2018

Jan. 23, 2018

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.gz https://www.iana.org/time-zones/repository/releases/tzdata2018c.tar.gz https://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.gz https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz https://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: 21988e876479e38661d41ea4c7b5218ba14b979739d7ba8d49a2d343bb9f37c654056ab21c046a6652715f012e4ca33c4aa109b1ec3ac5d0244dd3a7ea9ed6d2 tzcode2018c.tar.gz 0575c87c9ffcde7b7f62b0df928d8a0e8d93f832b5ef7227b3d8431686f851f1fd5372c7e768f2979830352433b31df7f3979a00c28ea3973a3a0987ebbfb835 tzdata2018c.tar.gz a1686902f81b4aceba494797e4eb8cdb8c1037ab7a27df9635b7a45ecfd90b8cf7b605a252ad1a8c67394a578f95aa9dff03071bc871120a98328de437c19b4f tzdb-2018c.tar.lz Here are the GPG checksums for the release files: -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJaZuAMAAoJEO2X6Q5iqn40NNsP/i+4WUmbLMMZnnR9FTvRUILo UAHYZRqC1KbdMppKeeyTL6thANvjpMjeYM8V54tzndzrMhBaPc8SpiwVgTevRtKZ wG9BSb8Hx/RDQeBWOjRwFx5/WQ+ha4aK0IFB8KB5gNFLOuyMn+9ZaxSzoEXmNWX0 Ddoizk516lpfGuhZCnPMVtDorebaAby0d3WMCxzEJ2w3gLOI4Aj8WVR2Cl5eTlA/ cpQ+bzLog5lnf+mzs/bJeMlfxPSskAlvIBYk905uPTAT/LDeod+T+BLBfcGEUb5J D64veBERj01NDwVLDRqHG0hdw8aPdMQyTLje6fI7sVh2cu4lGgA7QxHC+aTnmYjt 862/wX7dx2HtfuaIr+6eulAIR3+rix0CMndEXUGLtqnx4WySh5rT++V4crGcgzSH eRl2TOkBBxpYLIK6KtHd31V5WhJfTN2NQOZEFdrxy+Z2pPWZJrhcB9+0tYGoRVs0 ARQdm5I1w5JwiHO7sI0YHWCPZCVhDC2+/Izg668OUIdmFpqXanMAADkT5Qo9frlu 72cnL0MFMB4JCQwbqE1Xa1AOzz6bUG7zUfRDyAH6wZyHIxZgr5PmbbfUfoagOD0J /psdEJNsOUdg+wDou23UVRyt9/WIiZbXKWVTs14DMuqrHLUQAcFQtpYwb/U3z5mR 0I0syyatHweHMeftotgJ =gt0T -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJaZuAMAAoJEO2X6Q5iqn40WkcP/3/QD5VP4YT5/zLPqTE4hLMB iuNFJelf1Iv4hFXYCMhfnU+0MlUfvSBBKLI5uu1vTl48ms33Ku+CL6fKI8uIlwMG v0yTCOxRozMofUcjsm2IfGRlJgAajMPWDOGsD3jocX0Vf14m9siycy4xdBk7vNrs QUKL3zl0XOBQY51ivnYvEK/f8LJZzn7NHizL0VwI0rxO/Oj6o0Q2wWkE61tBS27r znn9lFRWH1Nh+TJ7Yh1mNAd4UOYGL9Q3eoWkl5MzPM3ujjVSdsEXhNLGemPrfE50 RzuvsLgiKqahBpC9Zxy39pqiO+riRKHLlNjxNcCeHw6M5w8/FuBwwozSmdchWaZn gD50k7az4F5nojUgzYTNGV6nW2CGflLLgOeUWMmYUyF999KpOJzLXNFqMuBYqOOu ODI7CJweT0/Ff9jjoKMSqg1rMMDEox/E127ms8uf6qGyjWvp0AQlA5O06bStfpjH HDJog9BcDXb64oiJsIg0K4UqqF1n7jMqiufhz4WhrqPqaTP9qJuorSn5yar/UsGc V2l2C+BdJhmsvQ9vkLrYJNWXks+oQSFJ1dYYpv+zp/MsiBV1/pKaYEXgurRfQBCW eHO57ovm2Pf59dghTnm7SyoiZeqCK/89MWxpX4YbDgzP4ZyBhS2g1/bk7toPajUa idAZsIgmZDmw77UHpPJu =nVJg -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJaZuAMAAoJEO2X6Q5iqn40rDcP/3cxJ0Ri2s3WNCnu1woSJ3KU zRc5lvC4YZRo8/4yqEjzcq8M2eiYs540WqE4kPm9dFSefCOWX6nw5imrU2cM9EfJ XPyrZho+r85uH5KMCgQ9J+AC1HBya4TPdaTPikEYVARBMmkwLtM34FxJz2VnFRhT ZQjDG+ncZNhOBXWu6Mughb6I38Cl19/Dn2iQJ9p0XTay6uytCMceZ+o52bugeWCL HlRkGqZgW9cxFygq3EBEGWN/IcsdFSZqpHLVslD5xeZP294tCW0LsgE/SZ0YP1c3 Dd0KWeC4iYbrETda57XA9+27siXwhT9hVQnXVeykmsmn+TftZHh89A+bVYlglhIi QXRH2pi9OX/8DgsTox3mswAM2OPFiUgdOthwVdnrdHjhWc74SFr7AARSmoIVZHve gKIQXCuTV+mcVKZ6ibHZHs86QQ/jevcLivlQdOO9MMHVNMu5ZjBR6E3QjY5TTwcW 2UT/JEMMluYA+b5xVrGOwWa2g2vU/K1nvOVX73vT3n552djrZ6NholegrVVbcVjO GySPxMwjm1MMlmvXnN0cr4eWzFamVdMMSBkn8X/aBjbHAIvnqiqoxK/9JQf0wEZV lgGETcAvxr540LUuY0R95SO3qy4MXrT5USMDUSnif8BsNoLe5MEExAmVJ3A7W1sP 3/xQouSXzl63eYI3Rvam =WEKZ -----END PGP SIGNATURE-----

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