Merge tzcode2004a.
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# $NetBSD: Theory,v 1.7 2003/12/20 00:12:05 kleink Exp $
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@(#)Theory 7.14
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# $NetBSD: Theory,v 1.8 2004/05/27 20:39:49 kleink Exp $
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@(#)Theory 7.15
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----- Outline -----
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@ -8,6 +8,7 @@
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Names of time zone regions
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Time zone abbreviations
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Calendrical issues
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Time and time zones on Mars
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----- Time and date functions -----
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@ -505,3 +506,48 @@ convert to the Gregorian calendar until the Soviet revolution of 1917.
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Source: H. Grotefend, _Taschenbuch der Zeitrechnung des deutschen
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Mittelalters und der Neuzeit_, herausgegeben von Dr. O. Grotefend
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(Hannover: Hahnsche Buchhandlung, 1941), pp. 26-28.
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----- Time and time zones on Mars -----
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Some people have adjusted their work schedules to fit Mars time.
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Dozens of special Mars watches were built for Jet Propulsion
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Laboratory workers who kept Mars time during the Mars Exploration
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Rovers mission (2004). These timepieces look like normal Seikos and
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Citizens but use Mars seconds rather than terrestrial seconds.
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A Mars solar day is called a "sol" and has a mean period equal to
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about 24 hours 39 minutes 35.244 seconds in terrestrial time. It is
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divided into a conventional 24-hour clock, so each Mars second equals
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about 1.02749125 terrestrial seconds.
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The prime meridian of Mars goes through the center of the crater
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Airy-0, named in honor of the British astronomer who built the
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Greenwich telescope that defines Earth's prime meridian. Mean solar
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time on the Mars prime meridian is called Mars Coordinated Time (MTC).
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Each landed mission on Mars has adopted a different reference for
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solar time keeping, so there is no real standard for Mars time zones.
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For example, the Mars Exploration Rover project (2004) defined two
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time zones "Local Solar Time A" and "Local Solar Time B" for its two
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missions, each zone designed so that its time equals local true solar
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time at approximately the middle of the nominal mission. Such a "time
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zone" is not particularly suited for any application other than the
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mission itself.
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Many calendars have been proposed for Mars, but none have achieved
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wide acceptance. Astronomers often use Mars Sol Date (MSD) which is a
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sequential count of Mars solar days elapsed since about 1873-12-29
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12:00 GMT.
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The tz database does not currently support Mars time, but it is
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documented here in the hopes that support will be added eventually.
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Sources:
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Michael Allison and Robert Schmunk,
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"Technical Notes on Mars Solar Time as Adopted by the Mars24 Sunclock"
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<http://www.giss.nasa.gov/tools/mars24/help/notes.html> (2004-03-15).
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Jia-Rui Chong, "Workdays Fit for a Martian", Los Angeles Times
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(2004-01-14), pp A1, A20-A21.
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@ -9,7 +9,7 @@
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<meta http-equiv="Content-type" content='text/html; charset="US-ASCII"' />
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<meta name="DC.Creator" content="Eggert, Paul" />
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<meta name="DC.Contributor" content="Olson, Arthur David" />
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<meta name="DC.Date" content="2003-09-21" />
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<meta name="DC.Date" content="2004-05-24" />
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<meta name="DC.Description"
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content="Sources of information about time zones and daylight saving time" />
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<meta name="DC.Identifier" content="http://www.twinsun.com/tz/tz-link.htm" />
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@ -19,7 +19,7 @@
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<body>
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<h1>Sources for Time Zone and Daylight Saving Time Data</h1>
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<address>
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@(#)tz-link.htm 7.41
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@(#)tz-link.htm 7.42
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</address>
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<p>
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Please send corrections to this web page to the
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@ -99,8 +99,8 @@ Here are some recent links that may be of interest.
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</p>
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<h2>Web pages using recent versions of the <code>tz</code> database</h2>
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<ul>
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<li><a href="http://www.bsdi.com/date/">Date and Time Gateway</a> is a
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text-based point-and-click interface to tables of current time
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<li><a href="http://twiki.org/cgi-bin/xtra/tzdate">Date and Time Gateway</a>
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is a text-based point-and-click interface to tables of current time
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throughout the world.</li>
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<li>Fancier web interfaces, roughly in ascending order of complexity, include:
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<ul>
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@ -157,6 +157,15 @@ href="http://www.perl.com/language/misc/Artistic.html">Artistic
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License</a>. DateTime::TimeZone also contains a script
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<code>tests_from_zdump</code> that generates test cases for each clock
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transition in the <code>tz</code> database.</li>
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<li><a href="http://oss.software.ibm.com/icu/">International Components for
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Unicode (ICU)</a> contains a C/C++ library for internationalization that
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has a compiler from <samp>tz</samp> source into an ICU-specific format.
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ICU is freely available under a BSD-style license.</li>
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<li><a href="http://joda-time.sourceforge.net/">Joda Time - Java date
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and time API</a> contains a class
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<code>org.joda.time.tz.ZoneInfoCompiler</code> that compiles
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<code>tz</code> source into a Joda-specific binary format. Joda Time
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is freely available under a BSD-style license.</li>
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</ul>
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<h2>Other <code>tz</code> binary file readers</h2>
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<ul>
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@ -177,6 +186,9 @@ under a BSD-style license.</li>
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</ul>
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<h2>Other <code>tz</code>-based time zone conversion software</h2>
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<ul>
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<li><a href="http://java.sun.com/">Sun Java</a> releases since 1.4
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contain a copy of a recent <samp>tz</samp> database in a Java-specific
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format.</li>
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<li><a
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href="http://www1.tip.nl/~t876506/AboutTimeZonesHC.html">HyperCard
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time zones calculator</a> is a HyperCard stack.</li>
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@ -330,7 +342,7 @@ is Singapore in the "Wrong" Time Zone?</a> details the
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history of legal time in Singapore and Malaysia.</dd>
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<dt>United Kingdom</dt>
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<dd><a
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href="http://student.cusu.cam.ac.uk/~jsm28/british-time/">History of
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href="http://www.srcf.ucam.org/~jsm28/british-time/">History of
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legal time in Britain</a> discusses in detail the country
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with perhaps the best-documented history of clock adjustments.
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The National Physical Laboratory also maintains an <a
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@ -362,6 +374,11 @@ among time scales like TAI, TDB, TT and UTC.</li>
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Space Flight - Reference Systems - Time Conventions</a>
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briefly explains interplanetary space flight timekeeping.</li>
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<li><a
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href="http://www.giss.nasa.gov/tools/mars24/help/notes.html">Technical
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Notes on Mars Solar Time as Adopted by the Mars24 Sunclock</a> briefly
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describes Mars Coordinated Time (MTC) and the diverse local time
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scales used by each landed mission on Mars.</li>
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<li><a
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href="http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletins.html">Bulletins
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maintained by the IERS EOP (PC)</a> contains official publications of
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the Earth Orientation Parameters Product Center of the
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@ -1,13 +1,13 @@
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/* $NetBSD: zic.c,v 1.22 2003/12/20 00:21:00 kleink Exp $ */
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/* $NetBSD: zic.c,v 1.23 2004/05/27 20:39:49 kleink Exp $ */
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#include <sys/cdefs.h>
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#ifndef lint
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#ifndef NOID
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__RCSID("$NetBSD: zic.c,v 1.22 2003/12/20 00:21:00 kleink Exp $");
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__RCSID("$NetBSD: zic.c,v 1.23 2004/05/27 20:39:49 kleink Exp $");
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#endif /* !defined NOID */
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#endif /* !defined lint */
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static char elsieid[] = "@(#)zic.c 7.115";
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static char elsieid[] = "@(#)zic.c 7.116";
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#include "private.h"
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#include "locale.h"
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@ -2158,8 +2158,8 @@ register const int wantedy;
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--i;
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}
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if (i < 0 || i >= len_months[isleap(y)][m]) {
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error(_("no day in month matches rule"));
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(void) exit(EXIT_FAILURE);
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if (noise)
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warning(_("rule goes past start/end of month--will not work with pre-2004 versions of zic"));
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}
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}
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if (dayoff < 0 && !TYPE_SIGNED(time_t))
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