Microsoft KB Archive/934111

= An update is available for Subsystem for UNIX-based Applications in Windows Vista that addresses daylight saving time changes in 2007 =

Article ID: 934111

Article Last Modified on 11/1/2007

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APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Enterprise
 * Windows Vista Enterprise 64-bit Edition

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Important The update that is described in this Microsoft Knowledge Base article has been replaced by the update that is described in Microsoft Knowledge Base articles 942894 and 942878. To make sure that Microsoft Windows has the latest time zone data, apply the appropriate update that is described in Microsoft Knowledge Base articles 942894 and 942878. You do not have to uninstall the update that is described in this Microsoft Knowledge Base article before you apply the update that is described in Microsoft Knowledge Base articles 942894 and 942878. Check the applicable version numbers of the product that you have before you download the fix.

For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

942894 An update that addresses the change to daylight saving time in 2007 is available for Windows Server 2003 R2-based computers and for Windows Vista-based computers that are running Subsystem for UNIX-based Applications

942878 A hotfix that addresses the change to daylight saving time in 2007 is available for Windows Services for UNIX and for Subsystem for UNIX-based Applications



The U.S. Energy Policy Act of 2005 was passed by the United States Congress in July, 2005. This Act extended daylight saving time (DST) in the United States by approximately four weeks. Therefore, beginning in 2007, DST will start three weeks earlier on March 11, 2007, and will end one week later on November 4, 2007. The new DST period is four weeks longer than previously observed. These four weeks are referred to as the &quot;extended DST period.&quot; For more information, visit the following Microsoft Web site:

http://support.microsoft.com/gp/dst_topissues



INTRODUCTION
An update for DST changes in 2007 is now available for computers that are running Subsystem for UNIX-based Applications (SUA) in Windows Vista.

Note Subsystem for UNIX-based Applications is available in the following versions of Windows Vista:
 * Windows Vista Ultimate
 * Windows Vista Enterprise



Software update information
In the spring of 2007, the start date and the end date for DST in the United States will change to comply with the Energy Policy Act of 2005. The dates will change as follows.

A time zone update for DST that will address this issue for Subsystem for UNIX-based Applications in Windows Vista is now available. This update modifies the Windows-to-Portable Operating System Interface (POSIX) time zone mapping that is built in to Subsystem for UNIX-based Applications.

A supported hotfix is now 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To apply this update, you must have the following installed:  Subsystem for UNIX-based Applications The hotfix that is mentioned in the following Microsoft Knowledge Base article:

932143 A hotfix is available for Microsoft Windows Services for UNIX and Subsystem for UNIX-based Applications that addresses the change to daylight saving time in 2007



Restart requirement
You must restart the computer after you apply this hotfix.

Update replacement information
This update does not replace any other updates.

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 Vista, 64-bit versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: SFU

Keywords: kbbug kbfix kbqfe kbpubtypekc kbhotfixserver KB934111

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