diff options
Diffstat (limited to 'lib/libc/time/WWW.htm')
| -rw-r--r-- | lib/libc/time/WWW.htm | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/lib/libc/time/WWW.htm b/lib/libc/time/WWW.htm new file mode 100644 index 00000000000..a17f03ffa45 --- /dev/null +++ b/lib/libc/time/WWW.htm @@ -0,0 +1,100 @@ +<!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> +<small> +@(#)WWW.htm 7.11 +$OpenBSD: WWW.htm,v 1.1 1998/01/18 23:24:49 millert Exp $ +</small> +</P> +<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 US Central Intelligence agency publishes a static +Standard Time Zones of the World map in multiple resolutions. +including +<A HREF="http://www.odci.gov/cia/publications/nsolo/rmap-gif/802483.gif">75 +kB</A>, +<A HREF="http://www.odci.gov/cia/publications/nsolo/rmap-tif/802483.tif">1 +MB</A>, and +<A HREF="http://www.odci.gov/cia/publications/nsolo/rmap-pdf/802483.pdf">3 +MB</A> versions. +The pictorial quality is good, but the map does 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://community.bellcore.com/mbr/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/energy/daylightsaving.html">Daylight +Saving Time -- Saving Time, Saving Energy</A> +is a history of DST in the US. +<LI><A HREF="http://www.yahoo.com/Science/Weights_and_Measures/Measurements/Time/Daylight_Saving_Time/">Yahoo! - Science:Weights and Measures:Measurements:Time:Daylight Saving Time</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 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> +(1997-12-26) +</P> +<H2>Arthur David Olson writes:</H2><P> +A good source of information about ISO 8601 seems to be +<A HREF="http://www.ft.uni-erlangen.de/~mskuhn/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> |