- tz - lists.iana.org

[PROPOSED] Fix 'zic -b slim' bug with TZ='CET'
by Paul Eggert June 15, 2019

June 15, 2019

Without this fix, 'zic -b slim' can mishandle transitions in the few obsolescent zones like CET that do not start with local mean time. For example, for CET it incorrectly optimizes away the first and third transitions, and treats the second transition as one to standard time instead of to DST. * zic.c (swaptypes): Remove. All uses removed. (writezone): Swap indices rather than contents of the old type 0 and the new (default) type 0 array entries. --- zic.c | 44 +++++++++++++++++++------------------------- 1 file changed, 19 insertions(+), 25 deletions(-) diff --git a/zic.c b/zic.c index 34228a5..03f33ee 100644 --- a/zic.c +++ b/zic.c @@ -1810,17 +1810,6 @@ atcomp(const void *avp, const void *bvp) return (a < b) ? -1 : (a > b); } -static void -swaptypes(int i, int j) -{ - { zic_t t = gmtoffs[i]; gmtoffs[i] = gmtoffs[j]; gmtoffs[j] = t; } - { char t = isdsts[i]; isdsts[i] = isdsts[j]; isdsts[j] = t; } - { unsigned char t = abbrinds[i]; abbrinds[i] = abbrinds[j]; - abbrinds[j] = t; } - { bool t = ttisstds[i]; ttisstds[i] = ttisstds[j]; ttisstds[j] = t; } - { bool t = ttisgmts[i]; ttisgmts[i] = ttisgmts[j]; ttisgmts[j] = t; } -} - struct timerange { int defaulttype; ptrdiff_t base, count; @@ -2066,7 +2055,6 @@ writezone(const char *const name, const char *const string, char version, THISDEFAULTTYPE appears as type 0 in the output instead of OLD0. TYPEMAP also omits unused types. */ old0 = strlen(omittype); - swaptypes(old0, thisdefaulttype); #ifndef LEAVE_SOME_PRE_2011_SYSTEMS_IN_THE_LURCH /* @@ -2085,12 +2073,16 @@ writezone(const char *const name, const char *const string, char version, if (isdsts[types[i]]) mrudst = types[i]; else mrustd = types[i]; - for (i = old0; i < typecnt; i++) - if (!omittype[i]) { - if (isdsts[i]) - hidst = i; - else histd = i; - } + for (i = old0; i < typecnt; i++) { + int h = (i == old0 ? thisdefaulttype + : i == thisdefaulttype ? old0 : i); + if (!omittype[h]) { + if (isdsts[h]) + hidst = i; + else + histd = i; + } + } if (hidst >= 0 && mrudst >= 0 && hidst != mrudst && gmtoffs[hidst] != gmtoffs[mrudst]) { isdsts[mrudst] = -1; @@ -2204,12 +2196,15 @@ writezone(const char *const name, const char *const string, char version, if (hicut) putc(currenttype, fp); - for (i = old0; i < typecnt; i++) - if (!omittype[i]) { - puttzcode(gmtoffs[i], fp); - putc(isdsts[i], fp); - putc((unsigned char) indmap[abbrinds[i]], fp); - } + for (i = old0; i < typecnt; i++) { + int h = (i == old0 ? thisdefaulttype + : i == thisdefaulttype ? old0 : i); + if (!omittype[h]) { + puttzcode(gmtoffs[h], fp); + putc(isdsts[h], fp); + putc(indmap[abbrinds[h]], fp); + } + } if (thischarcnt != 0) fwrite(thischars, sizeof thischars[0], thischarcnt, fp); @@ -2244,7 +2239,6 @@ writezone(const char *const name, const char *const string, char version, for (i = old0; i < typecnt; i++) if (!omittype[i]) putc(ttisgmts[i], fp); - swaptypes(old0, thisdefaulttype); } fprintf(fp, "\n%s\n", string); close_file(fp, directory, name); -- 2.21.0

1 0

[PROPOSED] * NEWS: Mention -b slim briefly.
by Paul Eggert June 14, 2019

June 14, 2019

--- NEWS | 1 + 1 file changed, 1 insertion(+) diff --git a/NEWS b/NEWS index 0e4c688..7aaae11 100644 --- a/NEWS +++ b/NEWS @@ -4,6 +4,7 @@ Unreleased, experimental changes Briefly: Brazil no longer observes DST. + 'zic -b slim' outputs smaller TZif files; please try it out. Palestine's 2019 spring-forward transition was on 03-29, not 03-30. Changes to future timestamps -- 2.21.0

1 0

[PROPOSED 1/3] Tune and simplify addtype
by Paul Eggert June 14, 2019

June 14, 2019

* zic.c (addtype): Avoid the need to call strcmp each time through the loop checking for duplicate zone types. The strcmp is unnecessary if we already have checked for duplicate abbreviations and so can just look at the strings’ offsets. So, look for those duplicates first. --- zic.c | 36 +++++++++++++++++++----------------- 1 file changed, 19 insertions(+), 17 deletions(-) diff --git a/zic.c b/zic.c index 2cd8cc7..3e27a48 100644 --- a/zic.c +++ b/zic.c @@ -2876,16 +2876,28 @@ addtype(zic_t gmtoff, char const *abbr, bool isdst, bool ttisstd, bool ttisgmt) { register int i, j; - /* - ** See if there's already an entry for this zone type. - ** If so, just return its index. - */ - for (i = 0; i < typecnt; ++i) { + if (! (-1L - 2147483647L <= gmtoff && gmtoff <= 2147483647L)) { + error(_("UT offset out of range")); + exit(EXIT_FAILURE); + } + + for (j = 0; j < charcnt; ++j) + if (strcmp(&chars[j], abbr) == 0) + break; + if (j == charcnt) + newabbr(abbr); + else { + /* + ** See if there's already an entry for this zone type. + ** If so, just return its index. + */ + for (i = 0; i < typecnt; i++) { if (gmtoff == gmtoffs[i] && isdst == isdsts[i] && - strcmp(abbr, &chars[abbrinds[i]]) == 0 && + j == abbrinds[i] && ttisstd == ttisstds[i] && ttisgmt == ttisgmts[i]) return i; + } } /* ** There isn't one; add a new one, unless there are already too @@ -2895,22 +2907,12 @@ addtype(zic_t gmtoff, char const *abbr, bool isdst, bool ttisstd, bool ttisgmt) error(_("too many local time types")); exit(EXIT_FAILURE); } - if (! (-1L - 2147483647L <= gmtoff && gmtoff <= 2147483647L)) { - error(_("UT offset out of range")); - exit(EXIT_FAILURE); - } + i = typecnt++; gmtoffs[i] = gmtoff; isdsts[i] = isdst; ttisstds[i] = ttisstd; ttisgmts[i] = ttisgmt; - - for (j = 0; j < charcnt; ++j) - if (strcmp(&chars[j], abbr) == 0) - break; - if (j == charcnt) - newabbr(abbr); abbrinds[i] = j; - ++typecnt; return i; } -- 2.21.0

1 2

UTC calculation for March 12, 3001 [IANA #1143241], [PR 9419866]
by Lasher, Beth June 10, 2019

June 10, 2019

In the year 3001, Daylight Savings time is applied on Sunday March 9, 3001 as expected. (Eastern Standard time). BUT on the following Thursday, March 12, 3001 at 3 am, it seems that another Daylight Savings Time change is applied. After March 12, 3001, the UTC time zone offset for Eastern Daylight Savings Time is 3 hours (not 4) and remains that way until the year 9999. Is this correct? What is the cause of this second time offset change?

10 16

[PROPOSED] Cite US DST legislation
by Paul Eggert June 7, 2019

June 7, 2019

* northamerica: Cite all the US federal DST legislation. (US): Adjust table to match the legislation more closely. This does not affect the TZif output files. --- northamerica | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/northamerica b/northamerica index 65827ec..52898de 100644 --- a/northamerica +++ b/northamerica @@ -93,10 +93,24 @@ # was the first nationwide legal time standard, and apparently # time was just called "Standard Time" or "Daylight Saving Time". -# From Arthur David Olson: -# US Daylight Saving Time ended on the last Sunday of *October* in 1974. -# See, for example, the front page of the Saturday, 1974-10-26 -# and Sunday, 1974-10-27 editions of the Washington Post. +# From Paul Eggert (2019-06-04): +# Here is the legal basis for the US federal rules. +# * Public Law 65-107 (1918-03-19) implemented standard and daylight saving +# time for the first time across the US, springing forward on March's last +# Sunday and falling back on October's last Sunday. +# * Public Law 66-40 (1919-08-20) repealed DST on October 1919's last Sunday. +# * Public Law 77-403 (1942-01-20) started wartime DST on 1942-02-09. +# * Public Law 79-187 (1945-09-25) ended wartime DST on 1945-09-30. +# * Public Law 89-387 (1966-04-13) reinstituted a national standard for DST, +# from April's last Sunday to October's last Sunday, effective 1967. +# * Public Law 93-182 (1973-12-15) moved the 1974 spring-forward to 01-06. +# * Public Law 94-434 (1974-10-05) moved the 1975 spring-forward to +# February's last Sunday. +# * Public Law 99-359 (1986-07-08) moved the spring-forward to April's first +# Sunday. +# * Public Law 109-50 (2005-08-08), effective 2007, moved the spring-forward +# to March's second Sunday and the fall-back to November's first Sunday. +# All transitions are at 02:00 local time. # From Arthur David Olson: # Before the Uniform Time Act of 1966 took effect in 1967, observance of @@ -152,11 +166,11 @@ Rule US 1918 1919 - Mar lastSun 2:00 1:00 D Rule US 1918 1919 - Oct lastSun 2:00 0 S Rule US 1942 only - Feb 9 2:00 1:00 W # War Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule US 1945 only - Sep lastSun 2:00 0 S +Rule US 1945 only - Sep 30 2:00 0 S Rule US 1967 2006 - Oct lastSun 2:00 0 S Rule US 1967 1973 - Apr lastSun 2:00 1:00 D Rule US 1974 only - Jan 6 2:00 1:00 D -Rule US 1975 only - Feb 23 2:00 1:00 D +Rule US 1975 only - Feb lastSun 2:00 1:00 D Rule US 1976 1986 - Apr lastSun 2:00 1:00 D Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D Rule US 2007 max - Mar Sun>=8 2:00 1:00 D -- 2.21.0

5 8

tzdb-latest.tar.gz download issue
by Matt Johnson June 4, 2019

June 4, 2019

The lzip file, https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz redirects to https://data.iana.org/time-zones/tzdb-latest.tar.lz and downloads successfully. The gzip file, https://www.iana.org/time-zones/repository/tzdb-latest.tar.gz redirects to https://data.iana.org/time-zones/tzdb-latest.tar.gz and then fails with a 404. They both used to work, not sure what happened. Thanks, Matt

4 4

Extend POSIX TZ to allow transition times outside 00-24 range, permanent DST
by Paul Eggert June 3, 2019

June 3, 2019

I recently proposed extending the POSIX spec for TZ strings. Please see: http://austingroupbugs.net/view.php?id=1252 This proposal is a modest one, as it doesn't specify TZ strings like 'America/Los_Angeles'. Instead it merely specifies the strings generated by zic and stored into TZif files. This includes strings like '<-03>3<-02>,M3.5.0/-2,M10.5.0/-1' which use times of day outside the 00-24 range, and strings like 'EST5EDT,0/0,J365/25' that represent permanent daylight saving time. This extension to POSIX TZ strings has already been specified in Internet RFC 8536 section 3.3.1 <https://tools.ietf.org/html/rfc8536#page-13> and I think it's a good idea to backport the extension to POSIX itself, as this will bless the common practice of taking the last line of a TZif file and using it as a TZ string on small platforms that lack room to store the TZif files. Please feel free to comment at austingroupbugs.net.

1 0

[PROPOSED] Add an outline to tz-link.html
by Paul Eggert June 1, 2019

June 1, 2019

* tz-link.html: Add an outline, so that it’s more like theory.html. --- tz-link.html | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 92 insertions(+), 2 deletions(-) diff --git a/tz-link.html b/tz-link.html index e0d8cc8..85fc001 100644 --- a/tz-link.html +++ b/tz-link.html @@ -18,6 +18,46 @@ histories and planned futures are often recorded only fitfully. Here is a summary of attempts to organize and record relevant data in this area. </p> + <h3>Outline</h3> + <nav> + <ul> + <li>The <code><abbr>tz</abbr></code> database product and process + <ul> + <li><a href="#tzdb">The <code><abbr>tz</abbr></code> database</a></li> + <li><a href="#download">Downloading the <code><abbr>tz</abbr></code> database</a></li> + <li><a href="#changes">Changes to the <code><abbr>tz</abbr></code> database</a></li> + <li><a href="#commentary">Commentary on the <code><abbr>tz</abbr></code> database</a></li> + </ul> + </li> + <li>Uses of the <code><abbr>tz</abbr></code> database + <ul> + <li><a href="#web">Web sites using recent versions of the <code><abbr>tz</abbr></code> database</a></li> + <li><a href="#protocols">Network protocols for <code><abbr>tz</abbr></code> data</a></li> + <li><a href="#compilers">Other <code><abbr>tz</abbr></code> compilers</a></li> + <li><a href="#TZif">Other <abbr>TZif</abbr> readers</a></li> + <li><a href="#software">Other <code><abbr>tz</abbr></code>-based time zone software</a></li> + </ul> + </li> + <li>Related data + <ul> + <li><a href="#other-dbs">Other time zone databases</a></li> + <li><a href="#maps">Maps</a></li> + <li><a href="#boundaries">Time zone boundaries</a></li> + </ul> + </li> + <li>Timekeeping concepts + <ul> + <li><a href="#civil">Civil time concepts and history</a></li> + <li><a href="#national">National histories of legal time</a></li> + <li><a href="#precision">Precision timekeeping</a></li> + <li><a href="#notation">Time notation</a></li> + <li><a href="#see-also">See also</a></li> + </ul> + </li> + </ul> + </nav> + +<section> <h2 id="tzdb">The <code><abbr title="time zone">tz</abbr></code> database</h2> <p> The <a href="https://en.wikipedia.org/wiki/Public_domain">public-domain</a> @@ -88,6 +128,9 @@ Universal Time</a> (<abbr>UTC</abbr>). The database also records when daylight saving time was in use, along with some time zone abbreviations such as <abbr>EST</abbr> for Eastern Standard Time in the <abbr>US</abbr>.</p> +</section> + +<section> <h2 id="download">Downloading the <code><abbr>tz</abbr></code> database</h2> <p> The following <a @@ -148,6 +191,9 @@ specified by <a href="https://tools.ietf.org/html/8536">Internet The code also lets you read a <abbr>TZif</abbr> file and interpret timestamps for that location.</p> +</section> + +<section> <h2 id="changes">Changes to the <code><abbr>tz</abbr></code> database</h2> <p> The <code><abbr>tz</abbr></code> code and data @@ -226,6 +272,9 @@ found in <a href="theory.html">Theory and pragmatics of the tz code and data</a> <a href="https://a0.github.io/a0-tzmigration/">A0 TimeZone Migration</a> displays changes between recent <code><abbr>tzdb</abbr></code> versions. </p> +</section> + +<section> <h2 id="commentary">Commentary on the <code><abbr>tz</abbr></code> database</h2> <ul> <li>The article @@ -239,6 +288,9 @@ href="https://blog.jonudell.net/2009/10/23/a-literary-appreciation-of-the-olsonz literary appreciation of the Olson/Zoneinfo/tz database</a> comments on the database's style.</li> </ul> +</section> + +<section> <h2 id="web">Web sites using recent versions of the <code><abbr>tz</abbr></code> database</h2> <p> @@ -270,6 +322,9 @@ calculates the current time difference between locations.</li> <li><a href="http://www.wx-now.com">Weather Now</a> and <a href="http://www.thetimenow.com">The Time Now</a> list the weather too.</li> </ul> +</section> + +<section> <h2 id="protocols">Network protocols for <code><abbr>tz</abbr></code> data</h2> <ul> <li>The <a href="https://www.ietf.org">Internet Engineering Task Force</a>'s @@ -302,6 +357,9 @@ title="Extensible Markup Language">XML</abbr></a> format, and a variant uses <a href="https://www.json.org"><abbr title="JavaScript Object Notation">JSON</abbr></a> format.</li> </ul> +</section> + +<section> <h2 id="compilers">Other <code><abbr>tz</abbr></code> compilers</h2> <ul> <li><a href="https://sourceforge.net/projects/vzic/">Vzic</a> is a <a @@ -439,6 +497,9 @@ source into text files, along with a runtime that can read those files. Tcl is freely available under a <abbr>BSD</abbr>-style license.</li> </ul> +</section> + +<section> <h2 id="TZif">Other <abbr>TZif</abbr> readers</h2> <ul> <li>The <a @@ -497,6 +558,9 @@ package contains <a href="https://www.haskell.org">Haskell</a> code that parses and uses <abbr>TZif</abbr> data. It is freely available under a <abbr>BSD</abbr>-style license.</li> </ul> +</section> + +<section> <h2 id="software">Other <code><abbr>tz</abbr></code>-based time zone software</h2> <ul> <li><a href="https://foxclocks.org">FoxClocks</a> @@ -554,6 +618,9 @@ a macOS program. Its developers <a href="http://veladg.com/tzoffer.html">offer free licenses</a> to <code><abbr>tz</abbr></code> contributors.</li> </ul> +</section> + +<section> <h2 id="other-dbs">Other time zone databases</h2> <ul> <li><a href="https://www.astro.com/atlas">Time-zone Atlas</a> @@ -582,6 +649,9 @@ Schedules Information Manual</a> of the International Air Transport Association gives current time zone rules for airports served by commercial aviation.</li> </ul> +</section> + +<section> <h2 id="maps">Maps</h2> <ul> <li>The <a href="https://www.cia.gov/index.html">United States Central @@ -609,6 +679,9 @@ much is time wrong around the world?</a> maps the difference between mean solar and standard time, highlighting areas such as western China where the two differ greatly. It's a bit out of date, unfortunately.</li> </ul> +</section> + +<section> <h2 id="boundaries">Time zone boundaries</h2> <p>Geographical boundaries between timezones are available from several <a href="https://en.wikipedia.org/wiki/Geolocation">geolocation</a> @@ -683,6 +756,9 @@ for land and territorial waters only). A captain can change ship's clocks any time after entering a new time zone; midnight changes are common.</li> </ul> +</section> + +<section> <h2 id="civil">Civil time concepts and history</h2> <ul> <li><a href="https://www.nist.gov/pml/time-and-frequency-division/popular-links/walk-thr…">A @@ -704,6 +780,9 @@ time zone boundary.</li> <li><a href="http://statoids.com/tconcept.html">Basic Time Zone Concepts</a> discusses terminological issues behind time zones.</li> </ul> +</section> + +<section> <h2 id="national">National histories of legal time</h2> <dl> <dt>Australia</dt> @@ -790,6 +869,9 @@ Navy (SOHMA) publishes an annual <a href="http://www.armada.gub.uy/sohma/index.php/servicios/datos-astronomicos" hreflang="es">almanac (in Spanish)</a>.</dd> </dl> +</section> + +<section> <h2 id="precision">Precision timekeeping</h2> <ul> <li><a @@ -878,6 +960,9 @@ without Leap Seconds</a> gives pointers on this contentious issue, which was active until 2015 and could become active again.</li> </ul> +</section> + +<section> <h2 id="notation">Time notation</h2> <ul> <li>The <a id="CLDR" href="http://cldr.unicode.org">Unicode Common Locale Data @@ -946,18 +1031,23 @@ any future changes to the rules. One should never set local time is nine hours ahead of <abbr>UT</abbr> and the time zone is called "<abbr>GMT</abbr>".</li> </ul> +</section> + +<section> <h2 id="see-also">See also</h2> <ul> <li><a href="theory.html">Theory and pragmatics of the tz code and data</a></li> <li><a href="tz-art.html">Time and the Arts</a></li> </ul> +</section> + +<footer> <hr> -<address> This web page is in the public domain, so clarified as of 2009-05-17 by Arthur David Olson. <br> Please send corrections to this web page to the <a href="mailto:tz@iana.org">time zone mailing list</a>. -</address> +</footer> </body> </html> -- 2.17.1

1 0

Hong Kong Time history
by P Chan May 31, 2019

May 31, 2019

*According to the Hong Kong Daylight-Saving Regulations, 1941, the 1941 spring-forward transition was at 03:00. http://sunzi.lib.hku.hk/hkgro/view/g1941/304271.pdf http://sunzi.lib.hku.hk/hkgro/view/g1941/305516.pdf *According to some articles from South China Morning Post, +08 was resumed on 1945-11-18 at 02:00. https://i.imgur.com/M2IsZ3c.png https://i.imgur.com/iOPqrVo.png https://i.imgur.com/fffcGDs.png *Some newspapers published on said the 1946 spring-forward transition was on 04-21 at 00:00. The Kung Sheung Evening News 1946-04-20 (Chinese) https://i.imgur.com/ZSzent0.png https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2FH7zGe%2FKF%2BFLYsu… p.4 The Kung Sheung Daily News 1946-04-21 (Chinese) https://i.imgur.com/7ecmRlcm.png https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2BQBGt1%2BwUj5qG2Gqt… p.4 *According to the Summer Time Ordinance (1946), the fallback transitions between 1946 and 1952 were at 03:30 Standard Time (+08) http://oelawhk.lib.hku.hk/archive/files/bb74b06a74d5294620a15de560ab33c6.pdf *Some other laws and regulations related to DST from 1953 to 1979 Summer Time Ordinance 1953 https://i.imgur.com/IOlJMav.jpg Summer Time (Amendment) Ordinance 1965 https://i.imgur.com/8rofeLa.jpg Interpretation and General Clauses Ordinance (1966) https://i.imgur.com/joy3msj.jpg Emergency (Summer Time) Regulation 1973 https://i.imgur.com/OpRWrKz.jpg Interpretation and General Clauses (Amendment) Ordinance 1977 https://i.imgur.com/RaNqnc4.jpg Resolution of the Legislative Council passed on 9 May 1979 https://www.legco.gov.hk/yr78-79/english/lc_sitg/hansard/h790509.pdf#page=39 P Chan

4 7

[PROPOSED 1/2] Update URLs
by Paul Eggert May 31, 2019

May 31, 2019

* northamerica, theory.html, tz-art.html, tz-how-to.html, tz-link.html: Update URLs. A lot of this is replacing "http:" by "https:" when either will do; most of the rest is updating URLs that moved. The substantive changes are upgrading from ISO 8601:2004 to ISO 8601-1:2019, adding a C++20 link, removing URLs for DJGPP and Walltime-js (now obsolete), removing URLs maintained by the National Physical Laboratory and astrologyschool.com (no longer existing), and saying that draft-murchison-tzdist-geolocate is expired. --- northamerica | 2 +- theory.html | 12 ++++---- tz-art.html | 48 ++++++++++++++--------------- tz-how-to.html | 4 +-- tz-link.html | 83 +++++++++++++++++++++----------------------------- 5 files changed, 68 insertions(+), 81 deletions(-) diff --git a/northamerica b/northamerica index fce043f..65827ec 100644 --- a/northamerica +++ b/northamerica @@ -2494,7 +2494,7 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 # From Paul Eggert (2001-03-03): # -# http://www.latimes.com/news/nation/20010303/t000018766.html +# https://www.latimes.com/archives/la-xpm-2001-mar-03-mn-32561-story.html # James F. Smith writes in today's LA Times # * Sonora will continue to observe standard time. # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that diff --git a/theory.html b/theory.html index e373022..e580ccc 100644 --- a/theory.html +++ b/theory.html @@ -88,7 +88,7 @@ href="https://en.wikipedia.org/wiki/POSIX">POSIX</a>, an international standard for <a href="https://en.wikipedia.org/wiki/Unix">UNIX</a>-like systems. As of this writing, the current edition of POSIX is: <a -href="http://pubs.opengroup.org/onlinepubs/9699919799/"> The Open +href="https://pubs.opengroup.org/onlinepubs/9699919799/"> The Open Group Base Specifications Issue 7</a>, IEEE Std 1003.1-2017, 2018 Edition. Because the database's scope encompasses real-world changes to civil @@ -186,7 +186,7 @@ in decreasing order of importance: href="https://en.wikipedia.org/wiki/ASCII">ASCII</a> letters, '<code>.</code>', '<code>-</code>' and '<code>_</code>'. Do not use digits, as that might create an ambiguity with <a - href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag…">POSIX + href="https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#ta…">POSIX <code>TZ</code> strings</a>. A file name component must not exceed 14 characters or start with '<code>-</code>'. @@ -379,8 +379,8 @@ in decreasing order of importance: special meaning to the <a href="https://en.wikipedia.org/wiki/Unix_shell">UNIX shell</a> and cause commands like - '<code><a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set">set</a> - `<a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/date.html">date</a>`</code>' + '<code><a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#s…">set</a> + `<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/date.html">date</a>`</code>' to have unexpected effects. Previous editions of this guideline required upper-case letters, but the Congressman who introduced @@ -1354,11 +1354,11 @@ Sources for time on other planets: Michael Allison and Robert Schmunk, "<a href="https://www.giss.nasa.gov/tools/mars24/help/notes.html">Technical Notes on Mars Solar Time as Adopted by the Mars24 Sunclock</a>" - (2015-06-30). + (2018-12-13). </li> <li> Jia-Rui Chong, - "<a href="http://articles.latimes.com/2004/jan/14/science/sci-marstime14">Workdays + "<a href="https://www.latimes.com/archives/la-xpm-2004-jan-14-sci-marstime14-story.ht…">Workdays Fit for a Martian</a>", <cite>Los Angeles Times</cite> (2004-01-14), pp A1, A20–A21. </li> diff --git a/tz-art.html b/tz-art.html index 32f523e..8c57174 100644 --- a/tz-art.html +++ b/tz-art.html @@ -25,7 +25,7 @@ briefly says why France has more time zones than Russia. "About Time" (1962; 59 minutes) is part of the Bell Science extravaganza, with Frank Baxter, Richard Deacon, and Les Tremayne. Its advisor was Richard Feynman, and it was voiced by Mel Blanc. -(<a href="http://www.imdb.com/title/tt0154110/">IMDb entry</a>.)</li> +(<a href="https://www.imdb.com/title/tt0154110/">IMDb entry</a>.)</li> </ul> <h2>Movies</h2> <ul> @@ -36,14 +36,14 @@ there is a reference to British Double Summer Time. The time does not play a large part in the plot; it's just a passing reference to the time when one of the characters was supposed to have died (but didn't). -(<a href="http://us.imdb.com/title/tt0038733/">IMDb entry.</a>) +(<a href="https://www.imdb.com/title/tt0038733/">IMDb entry.</a>) (Dave Cantor) <li> The 1953 railway comedy movie <em>The Titfield Thunderbolt</em> includes a play on words on British Double Summer Time. Valentine's wife wants him to leave the pub and asks him, "Do you know what time it is?" And he, happy where he is, replies: "Yes, my love. Summer double time." -(<a href="http://us.imdb.com/title/tt0046436/">IMDb entry.</a>) +(<a href="https://www.imdb.com/title/tt0046436/">IMDb entry.</a>) (Mark Brader, 2009-10-02) </li> <li> @@ -56,7 +56,7 @@ a gigantic computerized theft. To achieve this, at one location the crooks interfere with the microwave system supplying time signals to the computer, advancing the time by 0.1 second each minute over the last hour of 1999. (So this movie teaches us that 0.1 × 60 = 10.) -(<a href="http://us.imdb.com/title/tt0137494/">IMDb entry.</a>) +(<a href="https://www.imdb.com/title/tt0137494/">IMDb entry.</a>) (Mark Brader, 2009-10-02) </li> <li> @@ -183,7 +183,7 @@ European readers of the 1870s clearly held the U.S. press in deep contempt; the protagonists cross the U.S. without once reading a paper. Available versions include -<a href="http://www.literature.org/Works/Jules-Verne/eighty">an English +<a href="https://www.gutenberg.org/ebooks/103">an English translation</a>, and <a href="https://fourmilab.ch/etexts/www/tdm80j">the original French</a> "with illustrations from the original 1873 French-language edition". @@ -203,7 +203,7 @@ part in the novel." (Paul Eggert, 2006-04-22) </li> <li> John Dunning, <a -href="http://books.simonandschuster.com/Two-OClock-Eastern-Wartime/John-Dunning/9…"><em>Two +href="https://www.simonandschuster.com/books/Two-OClock-Eastern-Wartime/John-Dunn…"><em>Two O'Clock, Eastern Wartime</em></a>, 2001. Mystery, history, daylight saving time, and old-time radio. </li> @@ -234,7 +234,7 @@ Todd Strait, drums</td></tr> <tr><td>Notes</td><td>CD notes "additional lyric by Karrin Allyson; arranged by Russ Long and Karrin Allyson"</td></tr> <tr><td>ADO Rating</td><td>1 star</td></tr> -<tr><td><a href="http://www.allmusic.com/album/i-didnt-know-about-you-mw0000618657">AMG Rating</a></td><td>4 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/i-didnt-know-about-you-mw0000618657">AMG Rating</a></td><td>4 stars</td></tr> <tr><td>Penguin Rating</td><td>3.5 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Kevin Mahogany</td></tr> @@ -249,7 +249,7 @@ Ray Drummond, bass; Ralph Moore, tenor saxophone; Lewis Nash, drums</td></tr> <tr><td>ADO Rating</td><td>1.5 stars</td></tr> -<tr><td><a href="http://www.allmusic.com/album/double-rainbow-mw0000620371">AMG Rating</a></td><td>3 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/double-rainbow-mw0000620371">AMG Rating</a></td><td>3 stars</td></tr> <tr><td>Penguin Rating</td><td>3 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Joe Williams</td></tr> @@ -263,7 +263,7 @@ The Robert Farnon [39 piece] Orchestra</td></tr> <tr><td>Notes</td><td>This CD is also available as part of a 3-CD package from Telarc, "Triple Play" (CD-83461)</td></tr> <tr><td>ADO Rating</td><td>black dot</td></tr> -<tr><td><a href="http://www.allmusic.com/album/heres-to-life-mw0000623648">AMG Rating</a></td><td>2 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/heres-to-life-mw0000623648">AMG Rating</a></td><td>2 stars</td></tr> <tr><td>Penguin Rating</td><td>3 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Charles Fambrough</td></tr> @@ -278,7 +278,7 @@ Edward Simon, piano; Lenny White, drums; Marion Simon, percussion</td></tr> <tr><td>ADO Rating</td><td>2 stars</td></tr> -<tr><td><a href="http://www.allmusic.com/album/keeper-of-the-spirit-mw0000176559">AMG Rating</a></td><td>unrated</td></tr> +<tr><td><a href="https://www.allmusic.com/album/keeper-of-the-spirit-mw0000176559">AMG Rating</a></td><td>unrated</td></tr> <tr><td>Penguin Rating</td><td>3 stars</td></tr> </table> <hr> @@ -296,7 +296,7 @@ David Piltch, string bass</td></tr> <tr><td>Notes</td><td>Lyrical reference to "Eastern Standard Time" in Tom Waits' "Purple Avenue"</td></tr> <tr><td>ADO Rating</td><td>2.5 stars</td></tr> -<tr><td><a href="http://www.allmusic.com/album/blame-it-on-my-youth-mw0000274303">AMG Rating</a></td><td>3 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/blame-it-on-my-youth-mw0000274303">AMG Rating</a></td><td>3 stars</td></tr> <tr><td>Penguin Rating</td><td>unrated</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Milt Hinton</td></tr> @@ -327,7 +327,7 @@ and Good Time Charlie. <a href="http://www.chiaroscurojazz.com/album.php?C=310">Album info</a> is available.</td></tr> <tr><td>ADO Rating</td><td>3 stars</td></tr> -<tr><td><a href="http://www.allmusic.com/album/old-man-time-mw0000269353">AMG Rating</a></td><td>4.5 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/old-man-time-mw0000269353">AMG Rating</a></td><td>4.5 stars</td></tr> <tr><td>Penguin Rating</td><td>3 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Alan Broadbent</td></tr> @@ -341,7 +341,7 @@ Putter Smith, Bass; Frank Gibson, Jr., drums</td></tr> <tr><td>Notes</td><td>The CD cover features an analemma for equation-of-time fans</td></tr> <tr><td>ADO Rating</td><td>1 star</td></tr> -<tr><td><a href="http://www.allmusic.com/album/pacific-standard-time-mw0000645433">AMG Rating</a></td><td>4 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/pacific-standard-time-mw0000645433">AMG Rating</a></td><td>4 stars</td></tr> <tr><td>Penguin Rating</td><td>3.5 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Anthony Braxton/Richard Teitelbaum</td></tr> @@ -356,7 +356,7 @@ Leo Smith, trumpet and miscellaneous instruments; Leroy Jenkins, violin and miscellaneous instruments; Richard Teitelbaum, modular moog and micromoog synthesizer</td></tr> <tr><td>ADO Rating</td><td>black dot</td></tr> -<tr><td><a href="http://www.allmusic.com/album/silence-time-zones-mw0000595735">AMG Rating</a></td><td>4 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/silence-time-zones-mw0000595735">AMG Rating</a></td><td>4 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Charles Gayle</td></tr> <tr><td>CD</td><td>Time Zones</td></tr> @@ -366,7 +366,7 @@ Richard Teitelbaum, modular moog and micromoog synthesizer</td></tr> <tr><td>Total Time</td><td>49:06</td></tr> <tr><td>Personnel</td><td>Charles Gayle, piano</td></tr> <tr><td>ADO Rating</td><td>1 star</td></tr> -<tr><td><a href="http://www.allmusic.com/album/time-zones-mw0000349642">AMG Rating</a></td><td>4.5 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/time-zones-mw0000349642">AMG Rating</a></td><td>4.5 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>The Get Up Kids</td></tr> <tr><td>CD</td><td>Eudora</td></tr> @@ -375,7 +375,7 @@ Richard Teitelbaum, modular moog and micromoog synthesizer</td></tr> <tr><td>ID</td><td>357</td></tr> <tr><td>Total Time</td><td>65:12</td></tr> <tr><td>Notes</td><td>Includes the song "Central Standard Time." Thanks to Colin Bowern for this information.</td></tr> -<tr><td><a href="http://www.allmusic.com/album/eudora-mw0000592063">AMG Rating</a></td><td>2.5 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/eudora-mw0000592063">AMG Rating</a></td><td>2.5 stars</td></tr> <tr><td> </td><td></td></tr> <tr><td>Artist</td><td>Coldplay</td></tr> @@ -420,7 +420,7 @@ Supernaw.</td></tr> <tr><td>ID</td><td>272</td></tr> <tr><td>Total Time</td><td>73:05</td></tr> <tr><td>Notes</td><td>Includes the song "Twilight Time Zone."</td></tr> -<tr><td><a href="http://www.allmusic.com/album/lobster-leaps-in-mw0000794929">AMG Rating</a></td><td>3.5 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/lobster-leaps-in-mw0000794929">AMG Rating</a></td><td>3.5 stars</td></tr> <tr><td>ADO Rating</td><td>2 stars</td></tr> <tr><td> </td><td></td></tr> @@ -431,7 +431,7 @@ Supernaw.</td></tr> <tr><td>Label</td><td>Columbia</td></tr> <tr><td>ID</td><td>CK-8905</td></tr> <tr><td>Total Time</td><td>45:36</td></tr> -<tr><td><a href="http://www.allmusic.com/album/the-times-they-a-changin-mw0000202344">AMG Rating</a></td><td>4.5 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/the-times-they-a-changin-mw0000202344">AMG Rating</a></td><td>4.5 stars</td></tr> <tr><td>ADO Rating</td><td>1.5 stars</td></tr> <tr><td>Notes<td>The title song is also available on "Bob Dylan's Greatest Hits" and "The Essential Bob Dylan."</td></tr> <tr><td> </td><td></td></tr> @@ -442,7 +442,7 @@ Supernaw.</td></tr> <tr><td>Label</td><td>Universal Jazz France</td></tr> <tr><td>ID</td><td>B0012688-02</td></tr> <tr><td>Total Time</td><td>42:31</td></tr> -<tr><td><a href="http://www.allmusic.com/album/tide-mw0000815692">AMG Rating</a></td><td>3.5 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/tide-mw0000815692">AMG Rating</a></td><td>3.5 stars</td></tr> <tr><td>ADO Rating</td><td>2.5 stars</td></tr> <tr><td>Notes<td>Includes the song "Fire and Wood" with the lyric "The clocks were turned back you remember/Think it's still November." @@ -455,7 +455,7 @@ Supernaw.</td></tr> <tr><td>ID</td><td>B0005171-02</td></tr> <tr><td>Total Time</td><td>156:22</td></tr> <tr><td>ADO Rating</td><td>1 star</td></tr> -<tr><td><a href="http://www.allmusic.com/album/youre-getting-better-the-word-jazz-dot-master…">AMG Rating</a></td><td>4.5 stars</td></tr> +<tr><td><a href="https://www.allmusic.com/album/youre-getting-better-the-word-jazz-dot-maste…">AMG Rating</a></td><td>4.5 stars</td></tr> <tr><td>Notes</td><td>Includes the piece "What Time Is It" ("He knew what time it was everywhere...that counted").</td></tr> </table> @@ -478,16 +478,16 @@ The related book <em>What If?</em> has an entry </li> <li> Pig kills time in <a -href="http://www.gocomics.com/pearlsbeforeswine/2016/11/06"><em>Pearls +href="https://www.gocomics.com/pearlsbeforeswine/2016/11/06"><em>Pearls Before Swine</em> (2016-11-06)</a>. </li> <li> Stonehenge is abandoned in <a -href='http://www.gocomics.com/nonsequitur/2017/03/12'><em>Non Sequitur</em> +href='https://www.gocomics.com/nonsequitur/2017/03/12'><em>Non Sequitur</em> (2017-03-12)</a>. <li> The boss freaks out in <a -href='http://dilbert.com/strip/1998-03-14'><em>Dilbert</em> (1998-03-14)</a>. +href='https://dilbert.com/strip/1998-03-14'><em>Dilbert</em> (1998-03-14)</a>. </li> <li> Peppermint Patty: "What if the world comes to an end tonight, Marcie?" @@ -495,7 +495,7 @@ Peppermint Patty: "What if the world comes to an end tonight, Marcie?" Marcie: "I promise there'll be a tomorrow, sir ... in fact, it's already tomorrow in Australia!" <br> -(Charles M. Schulz, <a href='http://www.gocomics.com/peanuts/1980/06/13'><em>Peanuts</em>, 1980-06-13</a>) +(Charles M. Schulz, <a href='https://www.gocomics.com/peanuts/1980/06/13'><em>Peanuts</em>, 1980-06-13</a>) </li> </ul> <h2>Jokes</h2> diff --git a/tz-how-to.html b/tz-how-to.html index 8471b67..0bb66ad 100644 --- a/tz-how-to.html +++ b/tz-how-to.html @@ -535,9 +535,9 @@ href="https://en.wikipedia.org/wiki/Internationalization_and_localization">local the abbreviations. They are intended to be the values returned through the <code>"%Z"</code> format specifier to <a href="https://en.wikipedia.org/wiki/C_(programming_language)">C</a>’s -<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html"><code>strftime</code></a> +<a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html"><code>strftime</code></a> function in the -<a href="http://kirste.userpage.fu-berlin.de/chemnet/use/info/libc/libc_19.html#SEC3…">“C” locale</a>. +<a href="https://kirste.userpage.fu-berlin.de/chemnet/use/info/libc/libc_19.html#SEC…">“C” locale</a>. <li>If there is no generally-accepted abbreviation for a time zone, a numeric offset is used instead, e.g., <code>+07</code> for 7 hours diff --git a/tz-link.html b/tz-link.html index 89ebd40..e0d8cc8 100644 --- a/tz-link.html +++ b/tz-link.html @@ -41,8 +41,6 @@ title="Berkeley Software Distribution">BSD</abbr></a>, <a href="https://www.openbsd.org">Open<abbr>BSD</abbr></a>, <a href="https://www.chromium.org/chromium-os">Chromium OS</a>, <a href="https://cygwin.com">Cygwin</a>, -<a href="http://www.delorie.com/djgpp/"><abbr -title="DJ's GNU Programming Platform">DJGPP</abbr></a>, <a href="https://en.wikipedia.org/wiki/MINIX">MINIX</a>, <a href="https://www.mysql.com">MySQL</a>, <a href="https://en.wikipedia.org/wiki/WebOS"><abbr @@ -50,13 +48,13 @@ title="Web Operating System">webOS</abbr></a>, <a href="https://ibm.com/aix"><abbr title="Advanced Interactive eXecutive">AIX</abbr></a>, <a href="https://en.wikipedia.org/wiki/BlackBerry_10">BlackBerry 10</a>, -<a href="https://www.apple.com/ios/"><abbr +<a href="https://www.apple.com/ios"><abbr title="iPhone OS">iOS</abbr></a>, -<a href="https://www.apple.com/macos/">macOS</a>, +<a href="https://www.apple.com/macos">macOS</a>, <a href="https://www.microsoft.com/en-us/windows">Microsoft Windows</a>, -<a href="https://www.hpe.com/info/openvms">Open<abbr +<a href="https://www.vmssoftware.com">Open<abbr title="Virtual Memory System">VMS</abbr></a>, -<a href="https://www.oracle.com/database/index.html">Oracle Database</a>, and +<a href="https://www.oracle.com/database/">Oracle Database</a>, and <a href="https://www.oracle.com/solaris">Oracle Solaris</a>.</p> <p> Each main entry in the database represents a <dfn>timezone</dfn> @@ -251,16 +249,15 @@ These are listed roughly in ascending order of complexity and fanciness. time and zones.</li> <li><a href="https://www.timejones.com">TimeJones.com</a>, <a href="https://timezoneconverterapp.com">Time Zone Converter</a> and -<a href="http://worldclock.com">The World Clock</a> +<a href="https://worldclock.com">The World Clock</a> are time zone converters.</li> <li><a -href="http://twiki.org/cgi-bin/xtra/tzdatepick.html">Date and Time Gateway</a> +href="https://twiki.org/cgi-bin/xtra/tzdatepick.html">Date and Time Gateway</a> lets you see the <code><abbr>TZ</abbr></code> values directly.</li> <li><a href="http://www.convertit.com/Go/ConvertIt/World_Time/Current_Time.ASP">Current Time in 1000 Places</a> uses descriptions of the values.</li> -<li><a href="http://www.timezoneconverter.com/cgi-bin/tzc.tzc">Time Zone -Converter</a> +<li><a href="https://timezoneconverterapp.com/">Time Zone Converter</a> uses a pulldown menu.</li> <li><a href="http://home.kpn.nl/vanadovv/time/TZworld.html">Complete timezone information for all countries</a> displays tables of DST rules. @@ -284,10 +281,10 @@ along with <a href="https://tools.ietf.org/html/rfc7809">CalDAV</a> (Internet <abbr>RFC</abbr> 7809), a calendar access protocol for transferring time zone data by reference. The <a href="https://www.ietf.org/mailman/listinfo/tzdist-bis">tzdist-bis -mailing list</a> discusses the Internet draft <a +mailing list</a> discussed the Internet draft <a id="TZDIST-Geolocate" href="https://tools.ietf.org/html/draft-murchison-tzdist-geolocate">TZDIST -Geolocate Extension</a>, which lets a client determine its timezone +Geolocate Extension</a> (now expired), which let a client determine its timezone from its geographic location using a <a href="https://tools.ietf.org/html/rfc5870">'geo' URI</a>.</li> <li>The <a href="https://tools.ietf.org/html/rfc5545"> @@ -318,7 +315,7 @@ General Public License (<abbr title="General Public License">GPL</abbr>)</a>.</li> <li><a href="https://sourceforge.net/projects/tzical/">tziCal – tz database conversion utility</a> is like Vzic, except for the <a -href="https://www.microsoft.com/net">.NET framework</a> +href="https://dotnet.microsoft.com">.NET framework</a> and with a <abbr>BSD</abbr>-style license.</li> <li><a href="https://metacpan.org/release/DateTime-TimeZone">DateTime::TimeZone</a> @@ -336,11 +333,9 @@ Database Parser</a> is a <a href="https://en.wikipedia.org/wiki/C%2B%2B">C++</a> parser and runtime library that is <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0355r4.html">moving -forward</a> for inclusion in the next iteration of <a -href="https://isocpp.org/std/the-standard"><em><abbr -title="International Organization for Standardization">ISO</abbr> -International Standard ISO/IEC 14882:2017(E) – Programming -Language C++</em></a>. +forward</a> for inclusion in +<a href="https://en.wikipedia.org/wiki/C++20">C++20</a>, +the next iteration of the C++ standard. It is freely available under the <abbr title="Massachusetts Institute of Technology">MIT</abbr> license.</li> <li><a id="ICU" href="http://site.icu-project.org">International Components for @@ -366,8 +361,7 @@ tool</a> compiles <code><abbr>tz</abbr></code> source into the format used by Oracle Java.</li> <li>The <a href="https://www.oracle.com/technetwork/articles/java/jf14-date-time-2125367.html">Java -SE <code>java.time</code> <abbr>API</abbr></a> in Java 8 and later -can be supplemented by <a +SE 8 Date and Time</a> <abbr>API</abbr> can be supplemented by <a href="https://www.threeten.org/threeten-extra/">ThreeTen-Extra</a>, which is freely available under a <abbr>BSD</abbr>-style license.</li> <li><a href="https://www.joda.org/joda-time/">Joda-Time – Java date @@ -409,16 +403,14 @@ license.</li> <li><a href="https://github.com/mde/timezone-js">TimezoneJS.Date</a>'s <abbr>API</abbr> is upward compatible with standard JavaScript Dates. It is freely available under the Apache License.</li> -<li><a href="https://github.com/sproutsocial/walltime-js">Walltime-js</a> -translates <abbr>UT</abbr> to local time. It is freely available under -the <abbr>MIT</abbr> license.</li> </ul> <li><a href="https://github.com/JuliaTime/">JuliaTime</a> contains a compiler from <code><abbr>tz</abbr></code> source into <a href="https://julialang.org/">Julia</a>. It is freely available under the <abbr>MIT</abbr> license.</li> -<li><a href="https://github.com/pavkam/tzdb">Delphi/<abbr -title="Free Pascal Compiler">FPC</abbr> Time Zone Database</a> +<li><a href="https://github.com/pavkam/tzdb"><abbr>TZDB</abbr> – +<abbr>IANA</abbr> Time Zone Database for Delphi/<abbr +title="Free Pascal Compiler">FPC</abbr></a> compiles from <code><abbr>tz</abbr></code> source into <a href="https://en.wikipedia.org/wiki/Object_Pascal">Object Pascal</a> as compiled by <a href="https://en.wikipedia.org/wiki/Delphi_(IDE)">Delphi</a> @@ -542,7 +534,7 @@ which stores time zone data in the <a href="https://unicode.org/cldr/charts/latest/supplemental/zone_tzid.html">Zone → Tzid table</a> or <a -href="https://unicode.org/repos/cldr/trunk/common/supplemental/windowsZones.xml"><abbr>XML</abbr> +href="https://github.com/unicode-org/cldr/blob/master/common/supplemental/windows…"><abbr>XML</abbr> file</a> of the <abbr>CLDR</abbr> data maps proprietary zone IDs to <code><abbr>tz</abbr></code> names. These mappings can be performed programmatically via the <a href="https://github.com/mj1856/TimeZoneConverter">TimeZoneConverter</a> .NET library, @@ -598,15 +590,15 @@ title="Central Intelligence Agency">CIA</abbr>)</a> publishes a <a href="https://www.cia.gov/library/publications/the-world-factbook/graphics/ref_ma…">time zone map</a>; the <a -href="https://www.lib.utexas.edu/maps/world.html">Perry–Castañeda +href="https://legacy.lib.utexas.edu/maps/world.html">Perry–Castañeda Library Map Collection</a> of the University of Texas at Austin has copies of recent editions. The pictorial quality is good, but the maps do not indicate daylight saving time, and parts of the data are a few years out of date.</li> -<li><a href="https://www.worldtimezone.com">Current time around the world -and standard time zones map of the world</a> +<li><a href="https://www.worldtimezone.com">World Time Zone Map +with current time</a> has several fancy time zone maps; it covers Russia particularly well. The maps' pictorial quality is not quite as good as the <abbr>CIA</abbr>'s @@ -715,7 +707,7 @@ Zone Concepts</a> discusses terminological issues behind time zones.</li> <h2 id="national">National histories of legal time</h2> <dl> <dt>Australia</dt> -<dd>The Parliamentary Library has commissioned a <a +<dd>The Parliamentary Library commissioned a <a href="https://www.aph.gov.au/binaries/library/pubs/rp/2009-10/10rp10.pdf">research paper on daylight saving time in Australia</a>. The Bureau of Meteorology publishes a list of <a @@ -733,8 +725,8 @@ Portuguese)</a>.</dd> <dt>Canada</dt> <dd>National Research Council Canada publishes current and some older information about <a -href="https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html">time -zones & daylight saving time</a>.</dd> +href="https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-offic…">time +zones and daylight saving time</a>.</dd> <dt>Chile</dt> <dd>The Hydrographic and Oceanographic Service of the Chilean Navy publishes a <a href="https://www.horaoficial.cl/historia_hora.html" hreflang="es">history of @@ -760,7 +752,7 @@ of Legal Time in Germany</a>.</dd> href="ftp://ftp.cs.huji.ac.il/pub/tz/announcements" hreflang="he">announcements (in Hebrew)</a>.</dd> <dt>Italy</dt> -<dd>The National Institute of Metrological Research maintains a +<dd>The National Institute of Metrological Research publishes a <a href="http://oldsite.inrim.it/res/tf/ora_legale_i.shtml" hreflang="it">table of civil time (in Italian)</a>.</dd> <dt>Malaysia</dt> @@ -777,22 +769,17 @@ covers the history of local time in the Netherlands from ancient times.</dd> <dt>New Zealand</dt> <dd>The Department of Internal Affairs maintains a brief <a href="https://www.dia.govt.nz/Daylight-Saving-History">History of -Daylight Saving</a>. The privately-maintained <a -href="http://astrologyschool.com/nztime.html">History of New Zealand -time</a> has more details.</dd> +Daylight Saving</a>.</dd> <dt>Singapore</dt> <dd><a id="Singapore" -href="http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html">Why +href="http://www.math.nus.edu.sg/~mathelmr/teaching/timezone.html">Why is Singapore in the "Wrong" Time Zone?</a> details the history of legal time in Singapore and Malaysia.</dd> <dt>United Kingdom</dt> <dd><a href="https://www.polyomino.org.uk/british-time/">History of legal time in Britain</a> discusses in detail the country -with perhaps the best-documented history of clock adjustments. -The National Physical Laboratory also maintains an <a -href="http://www.npl.co.uk/educate-explore/what-is-time/archive-of-summer-time-da…">Archive -of Summer time dates</a>.</dd> +with perhaps the best-documented history of clock adjustments.</dd> <dt>United States</dt> <dd>The Department of Transportation's <a href="https://www.transportation.gov/regulations/recent-time-zone-proceedings">Recent @@ -800,7 +787,7 @@ Time Zone Proceedings</a> lists changes to time zone boundaries.</dd> <dt>Uruguay</dt> <dd>The Oceanography, Hydrography, and Meteorology Service of the Uruguayan Navy (SOHMA) publishes an annual <a -href="http://www.armada.mil.uy/Pagina/institucion/dimat/sohma/almanaque.html" hreflang="es">almanac +href="http://www.armada.gub.uy/sohma/index.php/servicios/datos-astronomicos" hreflang="es">almanac (in Spanish)</a>.</dd> </dl> <h2 id="precision">Precision timekeeping</h2> @@ -905,14 +892,14 @@ both <abbr title="Locale Data Markup Language">LDML</abbr> (an <abbr>XML</abbr> format) and <abbr>JSON</abbr>. <li> <a href="https://www.cl.cam.ac.uk/~mgk25/iso-time.html">A summary of -the international standard date and time notation</a> is a good -summary of +the international standard date and time notation</a> covers <a -href="https://www.iso.org/standard/40874.html"><em><abbr>ISO</abbr> -8601:2004 – Data elements and interchange formats – Information -interchange – Representation of dates and times</em></a>.</li> +href="https://www.iso.org/standard/70907.html"><em><abbr +title="International Organization for Standardization">ISO</abbr> +8601-1:2019 – Date and time – Representations for information +interchange – Part 1: Basic rules</em></a>.</li> <li> -<a href="https://www.w3.org/TR/xmlschema-2/#dateTime"><abbr>XML</abbr> +<a href="https://www.w3.org/TR/xmlschema/#dateTime"><abbr>XML</abbr> Schema: Datatypes – dateTime</a> specifies a format inspired by <abbr>ISO</abbr> 8601 that is in common use in <abbr>XML</abbr> data.</li> <li><a href="https://tools.ietf.org/html/rfc5322#section-3.3">§3.3 of -- 2.21.0

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Fwd: Historical timezone data for Bonin Islands (Ogasawara)
by Phake Nick May 29, 2019

May 29, 2019

Hello all, I have recently received some new information about timezone history of Bonin Islands, Japan as detailed in the attached message. Because their last time change to return to Japanese time when they return to Japanese rule was right before 1970, it mean per the current tz database rule, the information doesn't warrant creation of a new timezone for Bonin Islands itself and is thus as an anecdotal note for interest purpose only. However, in the attached link, it described some special timekeeping phenomenon regarding Marcus island, another remote island currently owned by Japanese in the same administrative unit as Bonin Islands. Many reports claim that the American coastal guard on the American quarter of the island use its own coastal guard time, and most sources describe the time as UTC+11, being two hours faster than JST used by some Japanese personnel on the island. Some sites describe it as same as Wake Island/Guam time although it would be incorrect to be same as Guam. And then in a few Japanese governmental report from 1980s (from National Institute of Information and Communications Technology) regarding the construction of VLBI facility on the Marcus Island, it claimed that there're three time standard being used on the island at the time which include not just JST (UTC+9) or [US]CG time (UTC+11) but also a JMSDF time (UTC+10) (Japan Maritime Self-Defense Force). Unfortunately there are no other sources that mentioned such time and there are also no information on things like how the tine was used. ---------- Forwarded message --------- From: Wakaba Date: 2019-1-28 Mon 13:48 Subject: Re: Question related to the page 昭和のサマータイム on suikawiki To: Phake Nick >> Hello, I see that there're a lot of information about DST at the time in Japan on Suikawiki, but a special area that's not mentioned in the page os Ogasawara 小笠原諸島 (Bonin Islands) which seems to have its own different history of governance. Do you know where can information related to timezone of the islands can be found? > Unfortunately we have no reliable source on time in US-controlled Ogasawara Islands at the moment. It turns out that National Diet Library of Japan has several reports by Japanese Government officers that describe the time used in islands when they visited there. According to them (and other sources such as newspapers), standard time UTC + 10 (JST + 1) and DST UTC + 11 (JST + 2) was used until its return to Japan at 1968-06-26 00:00 JST. The exact periods of DST are still unknown. I guessed Guam, Mariana, and Bonin and Marcus districts might have synchronized their DST periods, but reports imply they had their own decisions, i.e. there were three or more different time zones. Details: https://wiki.suikawiki.org/n/%E5%B0%8F%E7%AC%A0%E5%8E%9F%E8%AB%B8%E5%B3%B6%…

2 1

Update zone.tab with #KyivNotKiev
by Ігор Чигінь May 29, 2019

May 29, 2019

Hello, it's almost 28 years of using city name of non-existing USSR. I propose to use correct timezone name in zone.tab (also zone1970.tab?) UA +5026+03031 Europe/Kyiv More info from MFA of Ukraine: https://mfa.gov.ua/en/page/open/id/5418 Thanks, Ihor

3 2

https://www.timeanddate.com/news/time/brazil-scraps-dst.html
by DONATELLA SABELLICO May 28, 2019

May 28, 2019

Hi, this is the new Brasil announcement... https://www.timeanddate.com/news/time/brazil-scraps-dst.html We used the tzdb-2019a.tar.lz<https://data.iana.org/time-zones/releases/tzdb-2019a.tar.lz> (452.2kb) It seems they are ok for this year 2019 since I did not see any change DST for incoming Nov. Am I correct? When the new table are planned? thanks ::DISCLAIMER:: -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

2 1

Re: [tz] Issue with Africa/Casablanca
by Paul Eggert May 20, 2019

May 20, 2019

David Gauchard wrote: > What would you think of an > additional option like "--near-future" which would always produce not an > empty description for all timezones ? If it's that important for newlib perhaps we should just make it the default, under the argument that a POSIX-compatible prediction, even if wrong during Ramadan, is better than no prediction at all (as that will cause these clients to be wrong the whole year).

1 1

Issue with Africa/Casablanca
by David Gauchard May 18, 2019

May 18, 2019

Hello, Latest version of zic produces an empty TZ string with Africa/Casablanca (and El Aaiun) Would it better be at least GMT0 ? Thanks

2 1

[PROPOSED] Assume zic 2004 or later in "Apr Sun>=25" etc.
by Paul Eggert May 18, 2019

May 18, 2019

* asia (Zion), northamerica (Toronto): Use constructs like "Apr Sun>=25" and "Apr Fri<=1" that have been supported by zic since 2004. Although Solaris 8 used pre-2004 zic, Solaris 8 reached end-of-life in March 2012. * zic.8: State more clearly that "Apr Sun>=25" is allowed. --- asia | 19 +------------------ northamerica | 17 ++++------------- zic.8 | 9 +++++++++ 3 files changed, 14 insertions(+), 31 deletions(-) diff --git a/asia b/asia index f97c830..9518756 100644 --- a/asia +++ b/asia @@ -1782,32 +1782,15 @@ Rule Zion 2004 only - Sep 22 1:00 0 S # # ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2005+beyond.ps -# From Paul Eggert (2012-10-26): -# I used Ephraim Silverberg's dst-israel.el program -# <ftp://ftp.cs.huji.ac.il/pub/tz/software/dst-israel.el> (2005-02-20) -# along with Ed Reingold's cal-hebrew in GNU Emacs 21.4, -# to generate the transitions from 2005 through 2012. -# (I replaced "lastFri" with "Fri>=26" by hand.) -# The spring transitions all correspond to the following Rule: -# -# Rule Zion 2005 2012 - Mar Fri>=26 2:00 1:00 D -# -# but older zic implementations (e.g., Solaris 8) do not support -# "Fri>=26" to mean April 1 in years like 2005, so for now we list the -# springtime transitions explicitly. - # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Zion 2005 only - Apr 1 2:00 1:00 D +Rule Zion 2005 2012 - Apr Fri<=1 2:00 1:00 D Rule Zion 2005 only - Oct 9 2:00 0 S -Rule Zion 2006 2010 - Mar Fri>=26 2:00 1:00 D Rule Zion 2006 only - Oct 1 2:00 0 S Rule Zion 2007 only - Sep 16 2:00 0 S Rule Zion 2008 only - Oct 5 2:00 0 S Rule Zion 2009 only - Sep 27 2:00 0 S Rule Zion 2010 only - Sep 12 2:00 0 S -Rule Zion 2011 only - Apr 1 2:00 1:00 D Rule Zion 2011 only - Oct 2 2:00 0 S -Rule Zion 2012 only - Mar Fri>=26 2:00 1:00 D Rule Zion 2012 only - Sep 23 2:00 0 S # From Ephraim Silverberg (2013-06-27): diff --git a/northamerica b/northamerica index 8e5e351..fce043f 100644 --- a/northamerica +++ b/northamerica @@ -1701,19 +1701,10 @@ Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D # was meant. Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D -# The 1927-to-1939 rules can be expressed more simply as -# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S -# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D -# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D -# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S -# The rules below avoid use of Sun>=25 -# (which pre-2004 versions of zic cannot handle). -Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S -Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D -Rule Toronto 1932 only - May 1 2:00 1:00 D -Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D -Rule Toronto 1933 only - Oct 1 2:00 0 S -Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S +Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S +Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D +Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D +Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D diff --git a/zic.8 b/zic.8 index 6d893c2..89ea2d9 100644 --- a/zic.8 +++ b/zic.8 @@ -317,6 +317,15 @@ may be abbreviated or spelled out in full. There must be no white space characters within the .B ON field. +The +.q <= +and +.q >= +constructs can result in a day in the neighboring month; +for example, the IN-ON combination +.q "Oct Sun>=31" +stands for the first Sunday on or after October 31, +even if that Sunday occurs in November. .TP .B AT Gives the time of day at which the rule takes effect, -- 2.21.0

1 0

Estimate for a new tzdb release with Brazil rules.
by Chris Woodbury May 17, 2019

May 17, 2019

> Robert Elz kre at munnari.OZ.AU on Tue May 14 07:35:10 UTC 2019 wrote: > > When I once thought I might try that, I got told "git: command not found" > I have no interest whatever in installing that thing, just for this > >kre Wow. Perhaps one might check if "git" was installed. As we've no information as to what kind of system you're running on, it's hard to help you. (It might be as simple as it isn't in your PATH.) After checking the obvious, I usually start with Google: how to install "git" on .... If you're not the sysadmin, perhaps that would be a good place to start, too. She/he may have more motivation, too.

8 11

Decree for Chile DST change
by Juan Correa May 17, 2019

May 17, 2019

I couldn't find the decree for the chilean DST change until today (even when it was published on November 23th on the Official Gazette, I searched for it on december 2018 with no avail) http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/… The only extra bit of information is that America/Punta_Arenas is confirmed to not change until 2022 -- Juan Correa Poblete PS Labs (http://www.pslabs.cl)

2 1

Some extra information about the Eucla zone
by Gilmore Davidson May 17, 2019

May 17, 2019

After Australia’s clock change last weekend, the national broadcaster has published an article about the Eucla time zone: https://www.abc.net.au/news/2019-04-08/this-remote-stretch-of-desert-has-it… <https://www.abc.net.au/news/2019-04-08/this-remote-stretch-of-desert-has-it…> > Sergeant Chamberlain said when it comes to life on the Nullarbor, the custom made time zone was at the lower end of quirky. Some interesting snippets of information include a rough description of the geographical boundaries... > The time zone exists for about 340 kilometres and takes in the tiny roadhouse communities of Cocklebiddy, Madura, Madura, Eucla and Border Village. …and an indication that the zone has definitely been in existence since before the 1970 cut-off of the database: > Mr Pike has lived on the Nullarbor for 47 years > > […] > > 'Why'? > > "Good question," Mr Pike said. > > "I don't even know that, and it's been going for over 50 years.” This doesn’t change any of the existing data, but could be useful as a reference. Cheers, Gil

2 1

[PROPOSED] Ignore more non-source files
by Paul Eggert May 16, 2019

May 16, 2019

* .gitignore: Ignore *.diff, *.i, *.orig, *.rej, *.tar. Ignore check_* files, as they are created by ‘make check’. --- .gitignore | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/.gitignore b/.gitignore index 1e62d11..cf3b825 100644 --- a/.gitignore +++ b/.gitignore @@ -2,14 +2,20 @@ # This file is in the public domain. *.a *.asc +*.diff +*.i *.o +*.orig *.patch +*.rej +*.tar *.tar.* *.txt *.tzs *.zi *~ ChangeLog +check_* date leapseconds tzselect -- 2.21.0

1 0

[PROPOSED] Bring zic man page up to date
by Paul Eggert May 16, 2019

May 16, 2019

* zic.8: Don’t mention time(2), since zic does not rely on time_t any more. Mention other ways that -v generates warnings. ON fields can’t contain non-space white space characters either. Remove incorrect assertion that fractional seconds are not allowed. --- zic.8 | 60 +++++++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 48 insertions(+), 12 deletions(-) diff --git a/zic.8 b/zic.8 index 524a113..6d893c2 100644 --- a/zic.8 +++ b/zic.8 @@ -110,9 +110,7 @@ Be more verbose, and complain about the following situations: The input specifies a link to a link. .PP A year that appears in a data file is outside the range -of years representable by -.BR time (2) -values. +of representable years. .PP A time of 24:00 or more appears in the input. Pre-1998 versions of @@ -124,6 +122,36 @@ Pre-2004 versions of .B zic prohibit this. .PP +A time zone abbreviation uses a +.B %z +format. +Pre-2015 versions of +.B zic +do not support this. +.PP +A timestamp contains fractional seconds. +Pre-2018 versions of +.B zic +do not support this. +.PP +The input contains abbreviations that are mishandled by pre-2018 versions of +.B zic +due to a longstanding coding bug. +These abbreviations include +.q L +for +.q Link , +.q mi +for +.q min , +.q Sa +for +.q Sat , +and +.q Su +for +.q Sun . +.PP The output file does not contain all the information about the long-term future of a timezone, because the future cannot be summarized as an extended POSIX TZ string. For example, as of 2019 this problem @@ -137,8 +165,15 @@ code designed for older output formats. These compatibility issues affect only timestamps before 1970 or after the start of 2038. .PP -A time zone abbreviation has fewer than 3 characters. -POSIX requires at least 3. +The output file contains more than 1200 transitions, +which may be mishandled by some clients. +The current reference client supports at most 2000 transitions; +pre-2014 versions of the reference client support at most 1200 +transitions. +.PP +A time zone abbreviation has fewer than 3 or more than 6 characters. +POSIX requires at least 3, and requires implementations to support +at least 6. .PP An output file name contains a byte that is not an ASCII letter, .q "\*-" , @@ -279,7 +314,7 @@ or a weekday name preceded by (e.g., .BR "lastSunday" ) may be abbreviated or spelled out in full. -Note that there must be no spaces within the +There must be no white space characters within the .B ON field. .TP @@ -455,7 +490,7 @@ and .TP .B UNTIL The time at which the UT offset or the rule(s) change for a location. -It takes the form of YEAR [MONTH [DAY [TIME]]]. +It takes the form of one to four fields YEAR [MONTH [DAY [TIME]]]. If this is specified, the time zone information is generated from the given UT offset and rule change until the time specified, which is interpreted using @@ -587,10 +622,10 @@ Rule EU 1979 1995 \*- Sep lastSun 1:00u 0 \*- Rule EU 1981 max \*- Mar lastSun 1:00u 1:00 S Rule EU 1996 max \*- Oct lastSun 1:00u 0 \*- .sp -.ta \w'# Zone\0\0'u +\w'Europe/Zurich\0\0'u +\w'0:34:08\0\0'u +\w'RULES\0\0'u +\w'FORMAT\0\0'u +.ta \w'# Zone\0\0'u +\w'Europe/Zurich\0\0'u +\w'0:29:45.50\0\0'u +\w'RULES\0\0'u +\w'FORMAT\0\0'u # Zone NAME UTOFF RULES FORMAT [UNTIL] Zone Europe/Zurich 0:34:08 \*- LMT 1853 Jul 16 - 0:29:46 \*- BMT 1894 Jun + 0:29:45.50 \*- BMT 1894 Jun 1:00 Swiss CE%sT 1981 1:00 EU CE%sT .sp @@ -601,9 +636,10 @@ Link Europe/Zurich Europe/Vaduz In this example, the timezone is named Europe/Zurich but it has an alias as Europe/Vaduz. This example says that Zurich was 34 minutes and 8 seconds east of UT until 1853-07-16 at 00:00, when the legal offset -was changed to 7\(de\|26\(fm\|22.50\(sd; although this works out to -0:29:45.50, the input format cannot represent fractional seconds so it -is rounded here. After 1894-06-01 at 00:00 the UT offset became one hour +was changed to 7\(de\|26\(fm\|22.50\(sd, which works out to 0:29:45.50; +.B zic +treats this by rounding it to 0:29:46. +After 1894-06-01 at 00:00 the UT offset became one hour and Swiss daylight saving rules (defined with lines beginning with .q "Rule Swiss") apply. From 1981 to the present, EU daylight saving rules have -- 2.21.0

1 0

[PROPOSED] Assume zic 2017c or later when shrinking
by Paul Eggert May 16, 2019

May 16, 2019

The tzdata.zi file was first released in 2017c, and deliberately avoided zic features that were also new to that release, to avoid problems with people mistakenly running older zic when generating this new file. After a year’s wait it is reasonable to assume that anybody using this new file is also using a new-enough zic. This saves about 900 bytes in tzdata.zi. * NEWS: Mention this. * zishrink.awk (gen_rule_name, prehash_rule_names) (process_input_line, output_saved_lines): For clarity, use the convention that parameters are on the first line of function definition, and local vars are on later lines. (process_input_line): Assume zic 2017c or later. Make line types more explicit. --- NEWS | 5 +++++ zishrink.awk | 44 +++++++++++++++++++++++--------------------- 2 files changed, 28 insertions(+), 21 deletions(-) diff --git a/NEWS b/NEWS index c939b8f..be6dd26 100644 --- a/NEWS +++ b/NEWS @@ -25,6 +25,11 @@ Unreleased, experimental changes Europe/Rome between those dates. (Thanks to Stephen Trainor and Luigi Rosa.) + Changes to build procedure + + tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi + by a percent or so. + Release 2019a - 2019-03-25 22:01:33 -0700 diff --git a/zishrink.awk b/zishrink.awk index 8876b68..4e187ac 100644 --- a/zishrink.awk +++ b/zishrink.awk @@ -20,7 +20,8 @@ function record_hash(n, name) # Return a shortened rule name representing NAME, # and record this relationship to the hash table. -function gen_rule_name(name, n) +function gen_rule_name(name, \ + n) { # Use a simple memonic: the first two letters. n = substr(name, 1, 2) @@ -29,7 +30,8 @@ function gen_rule_name(name, n) return n } -function prehash_rule_names(name) +function prehash_rule_names( \ + name) { # Rule names are not part of the tzdb API, so substitute shorter # ones. Shortening them consistently from one release to the next @@ -148,20 +150,21 @@ function prehash_rule_names(name) } } -# Process an input line and save it for later output. +# Process the input line LINE and save it for later output. -function process_input_line(line, field, end, i, n, startdef) +function process_input_line(line, \ + field, end, i, n, startdef, \ + linkline, ruleline, zoneline) { # Remove comments, normalize spaces, and append a space to each line. sub(/#.*/, "", line) line = line " " gsub(/[\t ]+/, " ", line) - # Abbreviate keywords. Do not abbreviate "Link" to just "L", - # as pre-2017c zic erroneously diagnoses "Li" as ambiguous. - sub(/^Link /, "Li ", line) - sub(/^Rule /, "R ", line) - sub(/^Zone /, "Z ", line) + # Abbreviate keywords and determine line type. + linkline = sub(/^Link /, "L ", line) + ruleline = sub(/^Rule /, "R ", line) + zoneline = sub(/^Zone /, "Z ", line) # SystemV rules are not needed. if (line ~ /^R SystemV /) return @@ -169,7 +172,7 @@ function process_input_line(line, field, end, i, n, startdef) # Replace FooAsia rules with the same rules without "Asia", as they # are duplicates. if (match(line, /[^ ]Asia /)) { - if (line ~ /^R /) return + if (ruleline) return line = substr(line, 1, RSTART) substr(line, RSTART + 5) } @@ -179,21 +182,19 @@ function process_input_line(line, field, end, i, n, startdef) while (match(line, /:0[^:]/)) line = substr(line, 1, RSTART - 1) substr(line, RSTART + 2) - # Abbreviate weekday names. Do not abbreviate "Sun" and "Sat", as - # pre-2017c zic erroneously diagnoses "Su" and "Sa" as ambiguous. + # Abbreviate weekday names. while (match(line, / (last)?(Mon|Wed|Fri)[ <>]/)) { end = RSTART + RLENGTH line = substr(line, 1, end - 4) substr(line, end - 1) } - while (match(line, / (last)?(Tue|Thu)[ <>]/)) { + while (match(line, / (last)?(Sun|Tue|Thu|Sat)[ <>]/)) { end = RSTART + RLENGTH line = substr(line, 1, end - 3) substr(line, end - 1) } - # Abbreviate "max", "only" and month names. - # Do not abbreviate "min", as pre-2017c zic erroneously diagnoses "mi" - # as ambiguous. + # Abbreviate "max", "min", "only" and month names. gsub(/ max /, " ma ", line) + gsub(/ min /, " mi ", line) gsub(/ only /, " o ", line) gsub(/ Jan /, " Ja ", line) gsub(/ Feb /, " F ", line) @@ -221,7 +222,7 @@ function process_input_line(line, field, end, i, n, startdef) n = split(line, field) # Abbreviate rule names. - i = field[1] == "Z" ? 4 : field[1] == "Li" ? 0 : 2 + i = zoneline ? 4 : linkline ? 0 : 2 if (i && field[i] ~ /^[^-+0-9]/) { if (!rule[field[i]]) rule[field[i]] = gen_rule_name(field[i]) @@ -231,11 +232,11 @@ function process_input_line(line, field, end, i, n, startdef) # If this zone supersedes an earlier one, delete the earlier one # from the saved output lines. startdef = "" - if (field[1] == "Z") + if (zoneline) zonename = startdef = field[2] - else if (field[1] == "Li") + else if (linkline) zonename = startdef = field[3] - else if (field[1] == "R") + else if (ruleline) zonename = "" if (startdef) { i = zonedef[startdef] @@ -254,7 +255,8 @@ function process_input_line(line, field, end, i, n, startdef) output_line[nout++] = line } -function output_saved_lines(i) +function output_saved_lines( \ + i) { for (i = 0; i < nout; i++) if (output_line[i]) -- 2.21.0

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[PROPOSED] zic: omit pre-2017c chatter unless -v
by Paul Eggert May 16, 2019

May 16, 2019

* zic.c (byword): Put pre-2017c warnings in the same category as other pre-2015 etc. warnings: that is, output the warnings only if -v is given. --- zic.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/zic.c b/zic.c index 4bafe5d..5b932dc 100644 --- a/zic.c +++ b/zic.c @@ -3140,8 +3140,8 @@ byword(const char *word, const struct lookup *table) else return NULL; /* multiple inexact matches */ } - /* Warn about any backward-compatibility issue with pre-2017c zic. */ - if (foundlp) { + if (foundlp && noise) { + /* Warn about any backward-compatibility issue with pre-2017c zic. */ bool pre_2017c_match = false; for (lp = table; lp->l_word; lp++) if (itsabbr(word, lp->l_word)) { -- 2.21.0

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Estimate for a new tzdb release with Brazil rules.
by Pramoth Murali May 14, 2019

May 14, 2019

Wanted to request a follow-up to an earlier comment https://mm.icann.org/pipermail/tz/2019-April/027877.html <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmm.icann.…> . Specifically, “No rush for a new tzdb release (but of course we'll want something out before October :-)”. Do we have an estimate for when the new tzdb release might be available containing the Brazil rules? Is there any way I can request this be updated sooner than later? Understand there was a patch attached in an earlier thread. My company would ideally prefer to align with a more formal release cadence to get these changes. Thanks! -- Pramoth

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Spelling of Ukrainian cities #KyivNotKiev
by Vitaliy Stavropolskiy May 12, 2019

May 12, 2019

Hi! Maybe it's time to change the spelling of Ukrainian cities <https://mfa.gov.ua/en/page/open/id/5418>? I've found a comment in the tzdb: > # Admittedly English-language spelling of Ukrainian names is > # controversial, and some day "Kyiv" may become substantially more popular > in > # English; in the meantime, stick with the traditional English "Kiev" as > that > # means less disruption for our users. I think it's the right time to change it. For example, a lot of Airports and international media did it. For example,The Guardian: https://twitter.com/shaunwalker7/status/1095687682582286337 https://www.theguardian.com/guardian-observer-style-guide-k Airports in London, Toronto, Istanbul, Bucharest, etc.: 1. https://twitter.com/GamanOleksandr/status/1108371955353305095 2. https://procol-harum.livejournal.com/1091764.html?utm_source=twsharing&utm_… 3. https://www.facebook.com/UkrEmbassyDK/posts/2189053684497098 You can find a lot of other examples by using hashtag #KyivNotKiev Here is the link to the official information from the Ministry of Foreign Affairs of Ukraine: https://mfa.gov.ua/en/page/open/id/5418 Please, consider. Best regards, Vitalii Stavropolskyi

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