November 2014 - tz - lists.iana.org

Re: [tz] [Patch] Make it slightly easier to parse tzdata
by random832＠fastmail.us Nov. 4, 2014

Nov. 4, 2014

On Sat, Nov 1, 2014, at 16:24, Paul Eggert wrote: > Brian Inglis wrote: > > This would require a tradeoff between the compiled sizes of the > > decompressors on your platform and the compressed data: > > 94K tz.tar.xz > > We can shrink it even further than that, as follows: This requires embedding zic, though. I got the impression his post was about compressing the compiled zoneinfo files (which are, after all, what is required by the library functions)

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[PROPOSED PATCH] * tz-link.htm: Modernize URLs a bit. Omit unnecessary trailing slashes.
by Paul Eggert Nov. 2, 2014

Nov. 2, 2014

--- tz-link.htm | 96 ++++++++++++++++++++++++++++++------------------------------- 1 file changed, 48 insertions(+), 48 deletions(-) diff --git a/tz-link.htm b/tz-link.htm index 0dbd1b0..6b57415 100644 --- a/tz-link.htm +++ b/tz-link.htm @@ -8,7 +8,7 @@ <meta http-equiv="Content-type" content='text/html; charset="UTF-8"'> <meta name="DC.Creator" content="Eggert, Paul"> <meta name="DC.Contributor" content="Olson, Arthur David"> -<meta name="DC.Date" content="2014-10-31"> +<meta name="DC.Date" content="2014-11-02"> <meta name="DC.Description" content="Sources of information about time zones and daylight saving time"> <meta name="DC.Identifier" @@ -27,7 +27,7 @@ for many representative locations around the globe. It is updated periodically to reflect changes made by political bodies to <a href="http://en.wikipedia.org/wiki/Time_zone">time zone</a> boundaries and -<a href="http://en.wikipedia.org/wiki/Daylight_saving">daylight-saving</a> +<a href="http://en.wikipedia.org/wiki/Daylight_saving_time">daylight-saving</a> rules. This database (often called <code>zoneinfo</code> or <code><abbr>tz</abbr></code>) @@ -36,15 +36,15 @@ including <a href="http://www.gnu.org/software/libc/">the <abbr title="GNU's Not Unix">GNU</abbr> C Library</a> (used in -<a href="http://www.linux.org/"><abbr>GNU</abbr>/Linux</a>), -<a href="http://www.android.com/">Android</a>, -<a href="https://developer.mozilla.org/en-US/docs/Mozilla/Firefox_OS">Firefox +<a href="http://en.wikipedia.org/wiki/Linux"><abbr>GNU</abbr>/Linux</a>), +<a href="http://www.android.com">Android</a>, +<a href="https://developer.mozilla.org/en-US/Firefox_OS">Firefox <abbr title="Operating System">OS</abbr></a>, -<a href="http://www.freebsd.org/">Free<abbr +<a href="https://www.freebsd.org">Free<abbr title="Berkeley Software Distribution">BSD</abbr></a>, -<a href="http://netbsd.org/">Net<abbr>BSD</abbr></a>, -<a href="http://openbsd.org/">Open<abbr>BSD</abbr></a>, -<a href="http://cygwin.com/">Cygwin</a>, +<a href="http://netbsd.org">Net<abbr>BSD</abbr></a>, +<a href="http://openbsd.org">Open<abbr>BSD</abbr></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="http://en.wikipedia.org/wiki/Symbian">Symbian</a>, @@ -55,13 +55,13 @@ title="Advanced Interactive eXecutive">AIX</abbr></a>, <a href="http://en.wikipedia.org/wiki/BlackBerry_10">BlackBerry 10</a>, <a href="http://www.apple.com/ios/"><abbr title="iPhone OS">iOS</abbr></a>, -<a href="http://windows.microsoft.com/">Microsoft Windows</a>, -<a href="http://h71000.www7.hp.com/">Open<abbr +<a href="http://windows.microsoft.com">Microsoft Windows</a>, +<a href="http://h71000.www7.hp.com">Open<abbr title="Virtual Memory System">VMS</abbr></a>, -<a href="http://oracle.com/database">Oracle Database</a>, +<a href="https://www.oracle.com/database/index.html">Oracle Database</a>, +<a href="http://oracle.com/solaris">Oracle Solaris</a>, and <a href="http://www.apple.com/osx/"><abbr title="Operating System Ten">OS -X</abbr></a>, and -<a href="http://oracle.com/solaris">Solaris</a>.</p> +X</abbr></a>.</p> <p> Each location in the database represents a region where all clocks keeping local time have agreed since 1970. @@ -130,8 +130,8 @@ of the <a href="http://www.iana.org">Internet Assigned Numbers Authority (IANA)</a>. An <a href="https://github.com/eggert/tz">unofficial development repository</a> of the code and data is available -in <a href="http://git-scm.com/">Git</a> form -from <a href="https://github.com/">GitHub</a>; be careful, as this +in <a href="http://git-scm.com">Git</a> form +from <a href="https://github.com">GitHub</a>; be careful, as this repository is less well tested and probably contains more errors. <p> The code lets you compile the <code><abbr>tz</abbr></code> source files into @@ -173,7 +173,7 @@ database's style.</li> These are listed roughly in ascending order of complexity and fanciness. </p> <ul> -<li><a href="http://time.is/">Time.is</a> shows locations' +<li><a href="http://time.is">Time.is</a> shows locations' time and zones in a simple format.</li> <li><a href="http://twiki.org/cgi-bin/xtra/tzdatepick.html">Date and Time Gateway</a> @@ -188,25 +188,25 @@ uses a pulldown menu.</li> timezone information for all countries</a> displays tables of DST rules. <li><a href="http://timeanddate.com/worldclock/">The World Clock – Time Zones</a> lets you sort zone names and convert times.</li> -<li><a href="http://permatime.com/">Permatime</a> generates and views +<li><a href="http://permatime.com">Permatime</a> generates and views links that refer to a particular point in time and can be displayed in multiple time zones.</li> <li><a href="http://www.zeitverschiebung.net/en/">Time Difference</a> calculates the current time difference between locations.</li> -<li><a href="http://www.wx-now.com/">Weather Now</a> lists the weather too.</li> -<li><a href="http://worldtime.io/">worldtime.io</a> +<li><a href="http://www.wx-now.com">Weather Now</a> lists the weather too.</li> +<li><a href="http://worldtime.io">worldtime.io</a> also contains data about time zone boundaries; it supports queries via place names and shows location maps.</li> </ul> <h2>Network protocols for <code><abbr>tz</abbr></code> data</h2> <ul> -<li>The <a href="http://www.ietf.org/">Internet Engineering Task Force</a>'s -<a href="https://datatracker.ietf.org/wg/tzdist/charter/">Time Zone Data +<li>The <a href="http://www.ietf.org">Internet Engineering Task Force</a>'s +<a href="http://datatracker.ietf.org/wg/tzdist/charter/">Time Zone Data Distribution Service (tzdist) working group</a> is developing a scalable protocol for distributing time zone data to clients. It has generated a a <a href="http://datatracker.ietf.org/doc/draft-ietf-tzdist-service/">draft protocol for transferring time zone data</a> and a <a -href="https://datatracker.ietf.org/doc/draft-ietf-tzdist-caldav-timezone-ref/">draft +href="http://datatracker.ietf.org/doc/draft-ietf-tzdist-caldav-timezone-ref/">draft protocol for transferring time zone data by reference</a>. This work is based on the iCalendar and CalConnect efforts described below.</li> <li>The <a href="http://tools.ietf.org/html/rfc5545"> @@ -221,9 +221,9 @@ variant <a href="http://tools.ietf.org/html/rfc6321">xCal</a> title="Extensible Markup Language">XML</abbr></a> format, and a variant <a href="http://tools.ietf.org/html/rfc7265">jCal</a> (Internet <abbr>RFC</abbr> 7265) -uses <a href="http://www.json.org/"><abbr +uses <a href="http://www.json.org"><abbr title="JavaScript Object Notation">JSON</abbr></a> format. -<a href="http://calconnect.org/">CalConnect, The Calendaring and Scheduling +<a href="http://calconnect.org">CalConnect, The Calendaring and Scheduling Consortium</a> is promoting further work in this area. <a href="http://calconnect.org/publications/icalendartimezoneproblemsandrecommendati…">iCalendar TIMEZONE Problems and Recommendations</a> offers guidelines and @@ -266,14 +266,14 @@ and with a <abbr>BSD</abbr>-style license.</li> <li><a href="http://search.cpan.org/dist/DateTime-TimeZone/">DateTime::TimeZone</a> contains a script <code>parse_olson</code> that compiles -<code><abbr>tz</abbr></code> source into <a href="http://www.perl.org/">Perl</a> +<code><abbr>tz</abbr></code> source into <a href="http://www.perl.org">Perl</a> modules. It is part of the Perl <a -href="http://datetime.perl.org/">DateTime Project</a>, which is freely +href="http://datetime.perl.org">DateTime Project</a>, which is freely available under both the <abbr>GPL</abbr> and the Perl Artistic License. DateTime::TimeZone also contains a script <code>tests_from_zdump</code> that generates test cases for each clock transition in the <code><abbr>tz</abbr></code> database.</li> -<li><a href="http://icu-project.org/">International Components for +<li><a href="http://icu-project.org">International Components for Unicode (<abbr>ICU</abbr>)</a> contains C/C++ and <a href="http://en.wikipedia.org/wiki/Java_%28programming_language%29">Java</a> libraries for internationalization that @@ -289,7 +289,7 @@ contains a class <code>org.joda.time.tz.ZoneInfoCompiler</code> that compiles <code><abbr>tz</abbr></code> source into a Joda-specific binary format. Joda Time is freely available under a <abbr>BSD</abbr>-style license.</li> -<li><a href="http://nodatime.org/">Noda Time – Date and time API for +<li><a href="http://nodatime.org">Noda Time – Date and time API for .NET</a> and <a href="http://www.babiej.demon.nl/Tz4Net/main.htm">TZ4Net</a> are similar to Joda Time, but for the .NET framework instead of Java. They are freely available under the @@ -299,7 +299,7 @@ and a <abbr>BSD</abbr>-style license, respectively.</li> compilers and libraries include: <ul> <li><a href="http://momentjs.com/timezone/">Moment Timezone</a> is a -plugin for the <a href="http://momentjs.com/">Moment.js</a> date +plugin for the <a href="http://momentjs.com">Moment.js</a> date manipulation library. It is freely available under the <abbr title="Massachusetts Institute of Technology">MIT</abbr> license.</li> @@ -312,9 +312,9 @@ the <abbr>MIT</abbr> license.</li> </ul> <li><a href="http://pytz.sourceforge.net">pytz – World Timezone Definitions for Python</a> compiles <code><abbr>tz</abbr></code> source into -<a href="http://python.org/">Python</a>. +<a href="http://python.org">Python</a>. It is freely available under a <abbr>BSD</abbr>-style license.</li> -<li><a href="http://tzinfo.github.io/">TZInfo – +<li><a href="http://tzinfo.github.io">TZInfo – Ruby Timezone Library</a> compiles <code><abbr>tz</abbr></code> source into <a href="http://www.ruby-lang.org/en/">Ruby</a>. @@ -326,7 +326,7 @@ library that compiles <code><abbr>tz</abbr></code> source into a time zone repository whose format is either proprietary or an <abbr>XML</abbr>-encoded representation.</li> -<li><a href="http://tcl.tk/">Tcl</a> +<li><a href="http://tcl.tk">Tcl</a> contains a developer-oriented parser that compiles <code><abbr>tz</abbr></code> source into text files, along with a runtime that can read those files. Tcl is freely available under a <abbr>BSD</abbr>-style @@ -344,7 +344,7 @@ This library is freely available under the <abbr>GNU</abbr> Lesser General Public License (<abbr title="Lesser General Public License">LGPL</abbr>)</a>, and is widely used in <abbr>GNU</abbr>/Linux systems.</li> -<li><a href="http://www.gnome.org/">GNOME</a>'s Glib has +<li><a href="http://www.gnome.org">GNOME</a>'s Glib has a <code><abbr>tz</abbr></code> binary file reader written in C that creates a <code>GTimeZone</code> object representing sets of <abbr>UT</abbr> offsets. @@ -377,7 +377,7 @@ available under a BSD-style license.</li> </ul> <h2>Other <code><abbr>tz</abbr></code>-based time zone software</h2> <ul> -<li><a href="http://foxclocks.org/">FoxClocks</a> +<li><a href="http://foxclocks.org">FoxClocks</a> is an extension for <a href="http://google.com/chrome">Google Chrome</a> and for <a href="http://developer.mozilla.org/en/docs/Toolkit_API">Mozilla @@ -385,9 +385,9 @@ Toolkit</a> applications like <a href="http://mozilla.com/firefox">Firefox</a> and <a href="http://mozilla.com/thunderbird">Thunderbird</a>. It displays multiple clocks in the application window, and has a mapping -interface to <a href="http://earth.google.com/">Google Earth</a>. +interface to <a href="http://earth.google.com">Google Earth</a>. It is freely available under the <abbr>GPL</abbr>.</li> -<li><a href="http://golang.org/">Go programming language</a> +<li><a href="http://golang.org">Go programming language</a> implementations contain a copy of a 32-bit subset of a recent <code><abbr>tz</abbr></code> database in a Go-specific format.</li> @@ -420,7 +420,7 @@ Java</a> contains a copy of a subset of a recent <code><abbr>tz</abbr></code> database in a Java-specific format.</li> <li><a href="http://kimmo.suominen.com/sw/timezone/">Time Zone</a> is -a <a href="http://wordpress.org/">WordPress</a> plugin. It is freely +a <a href="http://wordpress.org">WordPress</a> plugin. It is freely available under a <abbr>BSD</abbr>-style license.</li> <li><a href="http://www.relativedata.com/time-zone-master">Time Zone Master</a> is a Microsoft Windows clock program that can automatically @@ -443,27 +443,27 @@ href="http://www.astrocom.com/astrology/books/american-atlas">one volume for the <abbr>US</abbr></a>, and <a href="http://www.astrocom.com/astrology/books/international-atlas">one for other locations</a>) by <a -href="http://astrocom.com/">Astro Computing Services</a>. +href="http://astrocom.com">Astro Computing Services</a>. These atlases are extensive but unreliable, as Shanks appears to have guessed many <abbr>UT</abbr> offsets and transitions. The atlases cite no sources and do not indicate which entries are guesswork.</li> <li><a href="http://www.hp.com/go/hpux/">HP-UX</a> has a database in its own <code>tztab</code>(4) format.</li> <li>Microsoft Windows has proprietary data mentioned above.</li> -<li><a href="http://worldtimeserver.com/">World Time Server</a> +<li><a href="http://worldtimeserver.com">World Time Server</a> is another time zone database.</li> <li><a href="http://tycho.usno.navy.mil/tzones.html">World Time Zones</a> contains data from the Time Service Department of the <abbr>US</abbr> Naval Observatory.</li> <li>The <a href="http://www.iata.org/publications/Pages/ssim.aspx">Standard Schedules Information Manual</a> of the -<a href="http://iata.org/">International Air Transport +<a href="http://iata.org">International Air Transport Association</a> gives current time zone rules for airports served by commercial aviation.</li> </ul> <h2>Maps</h2> <ul> -<li>The <a href="https://www.cia.gov/">United States Central +<li>The <a href="https://www.cia.gov">United States Central Intelligence Agency (<abbr title="Central Intelligence Agency">CIA</abbr>)</a> publishes a <a href="https://www.cia.gov/library/publications/the-world-factbook/graphics/ref_ma…">time @@ -476,7 +476,7 @@ recent editions. The pictorial quality is good, but the maps do not indicate summer time, and parts of the data are a few years out of date.</li> -<li><a href="http://worldtimezone.com/">Current time around the world +<li><a href="http://worldtimezone.com">Current time around the world and standard time zones map of the world</a> has several fancy time zone maps; it covers Russia particularly well. The maps' pictorial quality is not quite as good as the @@ -497,7 +497,7 @@ sets of <code><abbr>tz</abbr></code> regions.</li> maps geographical coordinates to a <code><abbr>tz</abbr></code> region. It is written in Go and is freely available under the Apache License.</li> <li><a href="http://derickrethans.nl/what-time-is-it.html">What Time -is It Here?</a> applies <a href="http://www.mongodb.org/">MongoDB</a> +is It Here?</a> applies <a href="http://www.mongodb.org">MongoDB</a> geospatial query operators to shapefiles' data.</li> <li><a href="http://statoids.com/statoids.html">Administrative Divisions of Countries ("Statoids")</a> contains lists of @@ -623,7 +623,7 @@ of Summer time dates</a>.</dd> href="http://literature.agilent.com/litweb/pdf/5965-7984E.pdf">The Science of Timekeeping</a> is a thorough introduction to the theory and practice of precision timekeeping.</li> -<li><a href="http://www.ntp.org/"><abbr +<li><a href="http://www.ntp.org"><abbr title="Network Time Protocol">NTP</abbr>: The Network Time Protocol</a> discusses how to synchronize clocks of @@ -653,9 +653,9 @@ Times</a> explains more abstruse astronomical time scales like <abbr title="Barycentric Dynamic Time">TDB</abbr>. <a href="http://www.ucolick.org/~sla/leapsecs/timescales.html">Time Scales</a> goes into more detail, particularly for historical variants.</li> -<li>The <a href="http://iau.org/"><abbr +<li>The <a href="http://iau.org"><abbr title="International Astronomical Union">IAU</abbr></a>'s <a -href="http://www.iausofa.org/"><abbr +href="http://www.iausofa.org"><abbr title="Standards Of Fundamental Astronomy">SOFA</abbr></a> collection contains C and <a href="http://en.wikipedia.org/wiki/Fortran">Fortran</a> @@ -673,7 +673,7 @@ describes Mars Coordinated Time (<abbr title="Mars Coordinated Time">MTC</abbr>) and the diverse local time scales used by each landed mission on Mars.</li> -<li><a href="http://leapsecond.com/">LeapSecond.com</a> is +<li><a href="http://leapsecond.com">LeapSecond.com</a> is dedicated not only to leap seconds but to precise time and frequency in general. It covers the state of the art in amateur timekeeping, and how the art has progressed over the past few decades.</li> -- 1.9.1

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time zone for Moscow time
by Mike Cantrell Nov. 2, 2014

Nov. 2, 2014

Hello, I'm not sure who to send this to, but a quick check on the internet indicates you're the ones --- I use a browser plugin (FoxClocks) which pulls information from the tz database, which I believe you keep. I noticed that Moscow time has not changed. Over a week ago, all of Russia went to 'winter time', falling back an hour, and has said that it will never go to summer time again. It appears that this change has not been entered into the database. Thank you for the effort to keep track of all this. All the best - Mike Cantrell

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[Patch] Make it slightly easier to parse tzdata
by Ed Schouten Nov. 2, 2014

Nov. 2, 2014

Hi there, Right now I am experimenting with trying to integrate the tzdata dataset into an embedded setup where I am not able to use zic(8) + /usr/share/zoneinfo. To summarize, my plan is to translate the entire tzdata into a set of C array/structure initializers (~50 KB for all timezones) and perform operations on those structures directly. While writing a Python script to translate the data, I noticed that there is a very small number of directives that would require quite a lot of additional code to parse properly. For example, "lastSun" makes a lot of sense as a special keyword in "Rule" directives, but it provides no functional gain in "Zone" directives. The same holds for the use of the "Dec 29 24:00" time used in Samoa's timezone. We should be able to use "Dec 30" instead, right? Anyway, I've attached a patch that should make it slightly easier to parse the tzdata files by removing these constructs. This should make it easier for people to reuse the dataset for other purposes. Thanks, -- Ed Schouten <ed(a)80386.nl>

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Venezuela may move back to UTC-4
by Paul Eggert Nov. 1, 2014

Nov. 1, 2014

Yesterday, President Nicolas Maduro ordered his vice president to review Venezuela's 2007 change from UTC-04:00 to UTC-04:30. Hugo Chavez, the previous president who ordered the change, argued that UTC-04:00 gave more light to poor children who walk to school before dawn through sometimes-dangerous streets. Maduro says he prefers later sunsets. For what it's worth, local mean time in Caracas is UTC-04:28. According to our (admittedly unreliable) records, Venezuela observed UTC-04:30 from 1912 through 1965, and observed UTC-04:00 from 1965 to 2007. My source: Reuters. Venezuela to reconsider Chavez's change in time zone. The Star 2014-11-01. http://www.thestar.com.my/News/World/2014/11/01/Venezuela-to-reconsider-Cha…

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[PROPOSED PATCH 1/4] * leapseconds.awk: Update the IERS's full name.
by Paul Eggert Oct. 31, 2014

Oct. 31, 2014

--- leapseconds.awk | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/leapseconds.awk b/leapseconds.awk index ee20ecc..bb81e96 100644 --- a/leapseconds.awk +++ b/leapseconds.awk @@ -15,8 +15,8 @@ BEGIN { print "# The NTP Timescale and Leap Seconds" print "# http://www.eecis.udel.edu/~mills/leap.html" print "" - print "# The International Earth Rotation Service periodically uses leap seconds" - print "# to keep UTC to within 0.9 s of UT1" + print "# The International Earth Rotation and Reference Systems Service" + print "# periodically uses leap seconds to keep UTC to within 0.9 s of UT1" print "# (which measures the true angular orientation of the earth in space); see" print "# Terry J Quinn, The BIPM and the accurate measure of time," print "# Proc IEEE 79, 7 (July 1991), 894-905 <http://dx.doi.org/10.1109/5.84965>." -- 1.9.1

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