Daylight saving time (DST) 2009 hotfix for the "(GMT+02:00) Cairo" and "(GMT+08:00) Perth" time zones for Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows Server 2008, and Windows Server 2008 R2

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INTRODUCTION

Egypt has announced a change to its daylight saving time (DST) policy. DST will now end on midnight August 21st. This hotfix changes the end date of DST for the "(GMT+02:00) Cairo" time zone in 2009. Specifically, the clock will move backward one hour at midnight between August 20th and August 21st.

Australia has announced the end of daylight saving time for the Western Australia time zone. This hotfix removes daylight saving time for the "(GMT+08:00) Perth" time zone.
More specifically, this hotfix does the following.

For Windows Vista-and-later Windows platforms:

Sets the DST end date for Egypt at 23:59:59.999 on August 20th, 2009.
Removes DST for the Western Australia time zone.

For Windows platforms that are earlier than Windows Vista (such as Windows Server 2003 and Windows XP):

Sets the DST end date for Egypt at 23:59:59.999 on August 20th, 2009.
Removes the DST start and end settings for 2009 for the Western Australia time zone. DST is still enabled for 2010. To complete the DST changes, see the "Important Notes" section.

RESOLUTION

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, you will notice a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Important Notes:

Users who install this hotfix on operating system that are earlier than Windows Vista require an additional step to obtain the 2010 part of the Western Australia DST fix. These users must install the upcoming 2009 December DST Cadence Release before January 7, 2010. By doing this, the user will have installed the complete DST fix for Western Australia that removes DST for the Western Australia time zone.
For more information about the previous August 2009 DST cumulative update 970653, click the following article number to view the article in the Microsoft Knowledge Base:
970653 (http://support.microsoft.com/kb/970653/ ) August 2009 cumulative time zone update for Microsoft Windows operating systems
If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Users on Windows Vista and Windows Server 2008 may notice the following text in the Date and Time window of Control Panel:
Daylight Saving Time ends on [Date out of range] at 0:00. The clock is not set to adjust for this change.
Note This is a display error only. It has no effect on functionality and can be safely ignored.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

Windows 7
Windows Server 2008
Windows Server 2008 Service Pack 1
Windows Server 2008 Service Pack 2
Windows Server 2008 R2
Windows Server 2003 Service Pack 2
Windows Vista
Windows Vista Service Pack 1
Windows Vista Service Pack 2
Windows XP Service Pack 2
Windows XP Service Pack 3

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

Registry information

To use this hotfix, you do not have to make any changes to the registry.

File information

The English version of this hotfix 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 7 and Windows Server 2008, x86-based versions