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diff --git a/usr.sbin/zic/WWW.htm b/usr.sbin/zic/WWW.htm new file mode 100644 index 0000000..2151c89 --- /dev/null +++ b/usr.sbin/zic/WWW.htm @@ -0,0 +1,97 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"> +<HTML> +<HEAD> +<TITLE>Sources for Time Zone and Daylight Saving Time Data</TITLE> +</HEAD> +<BODY> +<H1>Sources for Time Zone and Daylight Saving Time Data</H1> +<P> +<H6> +@(#)WWW.htm 7.16 +</H6> +<H2>Paul Eggert writes:</H2><P> +The public-domain tz 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>zoneinfo</samp>) +is used by several implementations, +including BSD, DJGPP, GNU/Linux, HP-UX, IRIX, Solaris, and UnixWare. +In the tz 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 <A HREF="ftp://ftp.gnu.org/pub/gnu/GETTING.GNU.SOFTWARE">GNU C Library</A> +has an independent, thread-safe implementation of +a time zone file reader. +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. +<UL> +<LI><A HREF="http://www.bsdi.com/date">Date and Time Gateway</A> +is a text-based source for tables of current time throughout the world. +Its point-and-click interface accesses a recent version of the tz data. +<LI><A HREF="http://www.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://www.hilink.com.au/times/">Local Times Around the World</A> +is a text-based system containing links to local time servers +throughout the world; though the coverage is limited, +the live data provide a nice way to check one's tables. +<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. +<LI>The United States Central Intelligence agency publishes time zone maps; +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 +the 1995 and 1997 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://pisolo.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 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://www.energy.ca.gov/daylightsaving.html">Daylight +Saving Time -- Saving Time, Saving Energy</A> +is a history of DST in the US. +<LI><A HREF="http://dir.yahoo.com/Science/Measurements_and_Units/Time/Time_Zones/">Yahoo! - Science:Measurements and Units:Time:Time Zones</A> +is where the famous Internet indexing service Yahoo! collects its time zone +info. +<LI>The <A HREF="http://www.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. +<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> +<P> +-- <A HREF="mailto:eggert@twinsun.com">eggert@twinsun.com</A> +(1998-09-22) +</P> +<H2>Arthur David Olson writes:</H2><P> +A good source of information about ISO 8601 seems to be +<A HREF="http://www.cl.cam.ac.uk/~mgk25/iso-time.html">International +Standard Date and Time Notation</A> +maintained by Markus Kuhn. +<P> +-- <A HREF="mailto:arthur_david_olson@nih.gov">arthur_david_olson@nih.gov</A> +(1996-01-04) +</P> +</BODY> +</HTML> |
