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diff --git a/lib/libc/time/tz-link.htm b/lib/libc/time/tz-link.htm new file mode 100644 index 00000000000..fe3c981a2cd --- /dev/null +++ b/lib/libc/time/tz-link.htm @@ -0,0 +1,195 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> +<!-- $OpenBSD: tz-link.htm,v 1.1 2000/04/16 16:24:04 d Exp $ --> +<HTML> +<HEAD> +<TITLE>Sources for Time Zone and Daylight Saving Time Data</TITLE> +<LINK REL="schema.DC" HREF="http://purl.org/DC/elements/1.1/"> +<META NAME="DC.Creator" CONTENT="Paul Eggert"> +<META NAME="DC.Contributor" CONTENT="Arthur David Olson"> +<META NAME="DC.Date" CONTENT="2000/03/04"> +<META NAME="DC.Description" + CONTENT="Sources of information about time zones and daylight saving time"> +<META NAME="DC.Identifier" CONTENT="http://www.twinsun.com/tz/tz-link.htm"> +<META NAME="Keywords" + CONTENT="database,daylight saving,DST,time zone,timezone,tz,zoneinfo"> +</HEAD> +<BODY> +<H1>Sources for Time Zone and Daylight Saving Time Data</H1> +<ADDRESS> +@(#)tz-link.htm 7.25 +</ADDRESS> +<P> +Please send corrections to this web page to the +<A HREF="mailto:tz@elsie.nci.nih.gov">time zone mailing list</A>. +<P> +<H2>The <samp>tz</samp> database</H2><P> +The public-domain time zone database contains code and data +that represent the history of local time +for many representative locations around the globe. +It is updated periodically to reflect changes made by political bodies +to UTC offsets and daylight-saving rules. +This database (often called <samp>tz</samp> or <samp>zoneinfo</samp>) +is used by several implementations, +including BSD, DJGPP, GNU/Linux, HP-UX, IRIX, Solaris, and UnixWare. +In the <samp>tz</samp> database's +<A HREF="ftp://elsie.nci.nih.gov/pub/">FTP distribution</A>, +the code is in the file <samp>tzcode<var>C</var>.tar.gz</samp>, +where <samp><var>C</var></samp> is the code's version; +similarly, the data are in <samp>tzdata<var>D</var>.tar.gz</samp>, +where <samp><var>D</var></samp> is the data's version. +<P> +The data are by no means authoritative. If you find errors, please +send changes to the <A HREF="mailto:tz@elsie.nci.nih.gov">time zone +mailing list</A>. You can also <A +HREF="mailto:tz-request@elsie.nci.nih.gov">subscribe</A> to the +mailing list, or retrieve the <A +HREF="ftp://elsie.nci.nih.gov/pub/tzarchive.gz">archive of old +messages</A> (in <A HREF="http://www.gzip.org/">gzip</A> compressed +format). +<P> +The <A HREF="http://www.gnu.org/software/libc/">GNU C Library</A> +has an independent, thread-safe implementation of +a time zone file reader that is compatible with <samp>tz</samp>. +This library is freely available under the GNU Library General Public License, +and is widely used in GNU/Linux systems. +<P> +The Web has several other sources for time zone and daylight saving time data. +Here are some recent links that may be of interest. +<H2>Web pages using recent versions of the <samp>tz</samp> database</H2> +<UL> +<LI><A HREF="http://www.bsdi.com/date/">Date and Time Gateway</A> is a +text-based point-and-click interface to tables of current time +throughout the world. +<LI><A HREF="http://sandbox.xerox.com/stewart/tzconvert.cgi">CGI/1.0 +URL Timezone Converter</A> is a similar interface, with source code +written in <A HREF="http://www.perl.org/">Perl</A>, using what Paul +Stewart calls the "20-line hack no one will let me forget". +<LI><A HREF="http://www.hilink.com.au/times/">Local Times Around the World</A> +is a fancier web interface. +<LI><A HREF="http://timezoneconverter.com/">Time Zone Converter</A> +is an even fancier interface. +<LI><A HREF="http://www.burbs.com/fcgi-bin/tzconvert.fcgi">Burbs time +zone converter</A> is a multilingual interface. +<LI><A HREF="http://www.timeanddate.com/worldclock/">The World Clock</A> +is a web interface to a time zone database derived from +<samp>tz</samp>'s. +</UL> +<H2>Other <SAMP>tz</SAMP>-based time zone conversion software</H2> +<UL> +<LI><A +HREF="http://www1.tip.nl/~t876506/AboutTimeZonesHC.html">HyperCard +time zones calculator</A> is a HyperCard stack. +<LI><A +HREF="http://timezone50.homepage.com/">Time Zone Converter</A> is a +Microsoft Windows 95/98/NT4 program. +</UL> +<H2>Other time zone databases</H2> +<UL> +<LI><A HREF="http://www.astro.ch/atlas/">Astrology / Astrologie -> +Astrodienst Atlas Database</A> is Astrodienst's Web version of <A +HREF="http://astrocom.com/books/xrefa.htm#SHANKS">Shanks's +excellent time zone history atlases</A> published by <A +HREF="http://astrocom.com/">Astro Communications Services</A>. +<LI><A HREF="http://worldtime.com/">WORLDTIME: interactive atlas, +time info, public holidays</A> +contains information on local time, sunrise and sunset, +and public holidays in several hundred cities around the world. +<LI><A HREF="http://tycho.usno.navy.mil/tzones.html">World Time Zones</A> +contains US Naval Observatory data, used as the source +for the <samp>usno*</samp> files in the <samp>tz</samp> distribution. +<LI>The <A HREF="http://iata.org/">International Air Transport Association</A> +publishes the IATA Standard Schedules Information Manual (SSIM), +which gives current time zone rules for +all the airports served by commercial aviation. +</UL> +<H2>Maps</H2> +<UL> +<LI>The United States Central Intelligence Agency publishes a <A +HREF="http://www.odci.gov/cia/publications/factbook/figures/802649.pdf">time +zone map</A>; the +<A HREF="http://www.lib.utexas.edu/Libs/PCL/Map_collection/world_maps.html"> +Perry-Castañeda Library Map Collection</A> +of the University of Texas at Austin has on-line copies of +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><A HREF="http://worldtimezone.com/">World time zones 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 CIA's +and (as usual with maps) the maps are not quite up to date. +</UL> +<H2>Daylight saving time concepts and history</H2> +<UL> +<LI><A HREF="http://webexhibits.com/daylightsaving/">Daylight +Saving Time -- History, rationale, laws and dates</A> +is a good overall history of DST. +<LI><A HREF="http://www.cstv.to.cnr.it/toi/uk/toi.html">The +Time of Internet</A> +contains good descriptions of Time Zones and daylight saving time, +with diagrams. +The time zone map is out of date, however. +<LI>A few countries have well-documented histories of legal time. +<DL> +<DT>Australia +<DD>The Community Relations Division of the NSW Attorney General's +Department maintains a history of <A +HREF="http://www.lawlink.nsw.gov.au/crd.nsf/pages/time2">daylight +saving in New South Wales</A>. +<DT>Brazil +<DD>The Time Service Department of the National Observatory +records <A HREF="http://pcdsh01.on.br/DecHV.html" +HREFLANG="pt-BR">Brazil's daylight saving time decrees (in +Portuguese)</A>. +<DT>Germany +<DD>The National Institute for Science and Technology maintains <A +HREF="http://www.ptb.de/english/org/4/43/432/lega.htm">a history of +German legal time</A>. +<DT>Israel +<DD>The Ministry of Interior periodically issues <A +HREF="ftp://ftp.huji.ac.il/pub/tz/announcements" +HREFLANG="he">announcements (in Hebrew)</A>. +<DT>United Kingdom +<DD><A +HREF="http://student.cusu.cam.ac.uk/~jsm28/british-time/">History of +legal time in Britain</A> is an excellent discussion for the country +with perhaps the best-documented history of clock adjustments. +</DL> +</UL> +<H2>Precision timekeeping</H2> +<UL> +<LI><A HREF="http://www.eecis.udel.edu/~ntp/">Time Server</A> discusses +the Network Time Protocol (NTP), used to synchronize clocks of Internet hosts. +<LI><A HREF="http://ecco.bsee.swin.edu.au/chronos/GMT-explained.html">A +Few Facts Concerning GMT, UT, and the RGO</A> +answers questions like "What is the difference between GMT and UTC?" +<LI><A +HREF="http://sadira.gb.nrao.edu/~rfisher/Ephemerides/times.html">Astronomical +Times</A> explains more abstruse astronomical time scales like TT, TCG, +and TDB. +<LI><A HREF="http://www.jpl.nasa.gov/basics/bsf2-3.htm">Earth +and Its Reference Systems</A> +briefly explains interplanetary space flight timekeeping. +<LI><A HREF="http://hpiers.obspm.fr/webiers/results/bul/README.html">Bulletins +of IERS</A> contains official publications of the +International Earth Rotation Service, the committee that decides +when leap seconds occur. +</UL> +<H2>Time notation</H2> +<UL> +<LI> +<A HREF="http://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 <A HREF="http://www.iso.ch/markete/moreend.htm">ISO +8601</A>. +</UL> +<H2>Related indexes</H2> +<UL> +<LI><A HREF="http://dmoz.org/Reference/Time/">Open Directory - +Reference: Time</A> +<LI><A HREF="tz-art.htm">Time and the Arts</A> +<LI><A HREF="http://dir.yahoo.com/Science/Measurements_and_Units/Time/Time_Zones/">Yahoo! - Science:Measurements and Units:Time:Time Zones</A> +</UL> +</BODY> +</HTML> |