A test version of the 2007 global time zone update for Windows is available

View products that this article applies to.

Daylight saving time update

Important The update in this article is superseded by the cumulative update in Microsoft Knowledge Base article 955839. To obtain the most recent information about daylight saving time (DST), click the following article number to view the article in the Microsoft Knowledge Base:

955839 (http://support.microsoft.com/kb/955839/ ) December 2008 cumulative time zone update for Microsoft Windows operating systems

You do not have to remove any previously installed DST update to apply this cumulative update.

This article describes a test version of an update. This test version is provided for testing only. Do not install this update on computers in a production environment. If you install this update on computers in a production environment, calendar appointments and other events that are scheduled between October 27, 2006 and November 5, 2006 may show an incorrect time. Additionally, the clock on the computer will not automatically adjust to the standard time settings on October 27, 2006. Instead, the clock will automatically adjust to show the time as one hour earlier on November 5, 2006. This behavior occurs because the update applies the daylight saving time (DST) settings that occur in 2007 to the time settings in 2006.

If this update is not removed from computers in your test environment by October 27, 2006, the clock will not be adjusted correctly.

INTRODUCTION

A test version of a time zone update for 2007 is now available for computers that are running Microsoft Windows Server 2003 and Microsoft Windows XP. In the spring of 2007, the start dates and the end dates for DST in the United States will change to comply with the Energy Policy Act of 2005. The dates will change as follows:

DST starts on the second Sunday in March at 2:00 A.M. Therefore, DST in 2007 starts three weeks earlier than DST in 2006.
DST ends on the first Sunday in November at 2:00 A.M. Therefore, DST ends one week later than in prior years.

The test version of the global time zone update that Microsoft will release is now available. The update includes the new start dates and end dates for DST in the United States. Additionally, the update includes the following:

Changes to DST and time zone settings that occur around the world in 2007.
Changes to DST and time zone settings that have occurred since the products in the "Applies to" section were originally released. For example, the update includes some changes that were previously released as individual updates that were documented in articles in the Microsoft Knowledge Base.

To apply the changes, the update modifies time zone settings in the registry and registers the changes in Microsoft Windows. To view a list of these registry settings, see the "DST and Time Zone Settings" section later in this article.

Back to the top

MORE INFORMATION

Service pack information

This update is included in Microsoft Windows Server 2003 Service Pack 2. For more information about the latest service pack for Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

889100 (http://support.microsoft.com/kb/889100/ ) How to obtain the latest service pack for Windows Server 2003

Back to the top

Microsoft Windows Server 2003 update information

Important The test version that this article describes has expired. In preparation for the final release of the 2007 time zone update, make sure that you uninstall the test version from all computers.

A supported update is now available from Microsoft, but it is only intended for use in testing environments. A final version of this update will be released later in 2006.

Restart requirement

You do not have to restart your computer after you apply this update.

Update replacement information

This update replaces the following updates:

913670 (http://support.microsoft.com/kb/913670/ ) An update is available to remove the Australian daylight saving time 2006 912475 update
918093 (http://support.microsoft.com/kb/918093/ ) New time zone update for Sri Lanka
921028 (http://support.microsoft.com/kb/921028/ ) A hotfix is available to change the daylight saving time for the (GMT+02:00) Cairo time zone in 2006 for Windows XP and for Windows Server 2003

File information

The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Server 2003, x86-based versions

Collapse this tableExpand this table

File name	File size	Date	Time	Platform	SP requirement	Service branch
Tzchange.exe	57,344	11-Sep-2006	12:17	x86	SP1	SP1QFE

Windows Server 2003, x64-based versions

Collapse this tableExpand this table

File name	File size	Date	Time	Platform	SP requirement	Service branch
Tzchange.exe	78,336	11-Sep-2006	15:15	x86	SP1	SP1QFE
Wtzchange.exe	57,344	11-Sep-2006	15:15	x64	SP1	WOW

Windows Server 2003, Itanium-based versions

Collapse this tableExpand this table

File name	File size	Date	Time	Platform	SP requirement	Service branch
Tzchange.exe	126,976	11-Sep-2006	15:12	x86	SP1	SP1QFE
Wtzchange.exe	57,344	11-Sep-2006	15:12	IA-64	SP1	WOW

Back to the top

Microsoft Windows XP update information

Restart requirement

You do not have to restart your computer after you apply this update.

Update replacement information

This update replaces the following updates:

913670 (http://support.microsoft.com/kb/913670/ ) An update is available to remove the Australian daylight saving time 2006 912475 update
918093 (http://support.microsoft.com/kb/918093/ ) New time zone update for Sri Lanka
921028 (http://support.microsoft.com/kb/921028/ ) A hotfix is available to change the daylight saving time for the (GMT+02:00) Cairo time zone in 2006 for Windows XP and for Windows Server 2003