63 lines
4.0 KiB
HTML
63 lines
4.0 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Daylight saving time" />
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<meta name="abstract" content="Use this information to understand daylight saving time (DST). Find out what DST is and which time zones use DST." />
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<meta name="description" content="Use this information to understand daylight saving time (DST). Find out what DST is and which time zones use DST." />
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<meta name="DC.Relation" scheme="URI" content="rzaticoncepts.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzatitime.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzatidst" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Daylight saving time</title>
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</head>
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<body id="rzatidst"><a name="rzatidst"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Daylight saving time</h1>
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<div><p>Use this information to understand daylight saving time (DST).
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Find out what DST is and which time zones use DST.</p>
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<p>Many countries or regions specify that their local system time be adjusted
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forward or backward by one hour, to accommodate annual changes in the number
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of daylight hours. This change might also be accompanied by a change in the
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time zone name. For example, in Toronto, Canada, 1 p.m. is announced in the
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winter as 1 p.m., Eastern Standard Time (EST), and is announced in the summer
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as 1 p.m., Eastern Daylight Time (EDT). Daylight saving time is also known
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as <dfn class="term">Advanced Time</dfn>, <dfn class="term">Summer Time</dfn>, or <dfn class="term">Legal Time</dfn> (with
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Standard Time also known as <dfn class="term">Winter Time</dfn>) in certain countries
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or regions. Daylight saving time adjustments in the southern hemisphere are
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opposite to those in the northern hemisphere.</p>
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<p>A general rule for DST changes is that the change from Standard Time to
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DST needs to be completed before 03:00 (local time) on the date or day that
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DST is to begin. Likewise, when changing from DST to Standard Time the time
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change occurs between midnight and 03:00 (local time) on the date or day when
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DST ends.</p>
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<p>Also note that if you use other automatic methods to adjust for DST in
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combination with a time zone that observes DST, you need to disable the other
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methods. Otherwise, your local system time might adjust more than 1 hour for
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DST.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaticoncepts.htm" title="Use this information to understand time management concepts such as time zones, coordinated universal time (UTC), and daylight saving time (DST).">Concepts</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzatitime.htm" title="Use this information to understand time concepts such as time zones, coordinated universal time, system time, and job time.">Time</a></div>
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</div>
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</div>
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</body>
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</html>
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