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Revision (vendor branch), Fri Sep 5 02:07:33 1997 UTC (22 years, 10 months ago) by jtc
Branch: ADO
CVS Tags: netbsd-1-3-base, netbsd-1-3-RELEASE, netbsd-1-3-PATCH003-CANDIDATE2, netbsd-1-3-PATCH003-CANDIDATE1, netbsd-1-3-PATCH003-CANDIDATE0, netbsd-1-3-PATCH003, netbsd-1-3-PATCH002, netbsd-1-3-PATCH001, netbsd-1-3-BETA, netbsd-1-3, TZCODE1997G
Changes since +100 -100 lines

import tzcode1997g

Sources for Time Zone and Daylight Saving Time Data
<H1>Sources for Time Zone and Daylight Saving Time Data</H1>
@(#)WWW.htm	7.9
<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, 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.
The Web has several other sources for time zone and daylight saving time data.
Here are some recent links that may be of interest.
<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.
<A HREF="http://www.odci.gov/cia/publications/nsolo/rmap-gif/802483.gif">75
<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 RGO, GMT, and UT, by Richard B. Langley</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
<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.
-- <A HREF="mailto:eggert@twinsun.com">eggert@twinsun.com</A>
<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.
-- <A HREF="mailto:arthur_david_olson@nih.gov">arthur_david_olson@nih.gov</A>
<H2>Manavendra Thakur writes:</H2><P>
<A HREF="http://www.dhl.com/dhl/dhlinfo/1bb.html">DHL Information</A>
is run by <A HREF="http://www.dhl.com/">DHL</A>
(the courier company), and it presents a list of the
countries served by that company....
Here's an example of what you'll see for the
<A HREF="http://www.dhl.com/dhlinfo/country/unitedki.html">United Kingdom</A>.
I find this rather handy, and given that DHL covers 217 countries and
territories, it's pretty comprehensive coverage.
(I have no idea what system DHL is using to calculate the local time, but
it's been accurate so far.)
-- <A HREF="mailto:Manavendra_Thakur@NeXT.COM">Manavendra_Thakur@NeXT.COM</A>