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+++ b/Symbian3/SDK/Source/GUID-9BE3DEBE-A1CE-5A2F-9746-1E6F2B5B050E.dita Thu Jan 21 18:18:20 2010 +0000
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License
+"Eclipse Public License v1.0" which accompanies this distribution,
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+ Nokia Corporation - initial contribution.
+Contributors:
+-->
+<!DOCTYPE concept
+ PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-9BE3DEBE-A1CE-5A2F-9746-1E6F2B5B050E" xml:lang="en"><title>Environment
+and DST Changes</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>This section explains the effect on alarms due to the environment and DST
+changes. </p>
+<section><title>Environment Changes</title> <p>An environment change typically
+involves change in the system time/date, workdays or UTC offset, and due to
+this, alarm's expiry time can be put in the past.</p><p>When an environment
+change occurs, the Alarm Server can respond in any of the following ways:</p><ul>
+<li><p>The Alarm Server queues the alarms that have been skipped. These alarms
+then expire immediately and must be acknowledged by the device user.</p></li>
+<li><p>The Alarm Server uses <codeph>KSkippedAlarmInstancesPubSubKey</codeph> P&S
+key to notify the clients about the skipped calendar alarms. This key can
+be used only by the device creators.</p></li>
+</ul><p>Alarm Server observes changes in the UTC offset as a locale change
+since the UTC offset is set according to the localized position. It observes
+this offset from the system, and on change of this offset, only the alarms
+in the alarm queue that are based on the floating time undergoes changes.</p><p><b>NOTE</b>:
+All alarms in the alarm queue are re-evaluated only if system time/date and
+workday changes. This is applicable for all alarms irrespective of their time
+formats. The workday changes are also a locale change for the system.</p></section>
+<section><title>Daylight Saving Time Changes</title> <p>Daylight Saving Time
+(DST) or Summer Time, is a way of utilizing more daylight by advancing the
+local time by one hour during the summer. </p> <p>The clocks are adjusted
+forward by one hour at the beginning of spring and are adjusted backward in
+autumn. The time adjusted backward by one hour in autumn is usually referred
+as Standard Time (or Winter Time). In a typical case where a one-hour shift
+occurs at 02:00 local time, the clock is adjusted forward from 02:00 standard
+time to 03:00 DST in spring and that day has 23 hours. Whereas in autumn,
+the clock is adjusted backward from 02:00 DST to 01:00 standard time, repeating
+that hour, and that day has 25 hours. </p> <p>Alarm Server observes this DST
+event from the Time Zone Server using <xref href="GUID-EAB78B96-8373-3A96-AA36-43207C3FB514.dita"><apiname>KDSTChangePropertyKey</apiname></xref> P&S
+key. This key can be used only by the device creators. On receiving notification
+of this event through the key, all alarms (based on the floating time format)
+in the alarm queue are re-evaluated for their expiry time. </p> </section>
+</conbody></concept>
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