December 2012 cumulative time zone update for Windows operating systems

The update that is described in this article changes the time zone data to accommodate daylight saving time (DST) changes in several countries.

The update that is described in this article is a cumulative update rollup that includes all previous Windows time zone changes. For more information about how DST changes may affect other Microsoft products, go to the following Microsoft website: For more information about how DST changes may affect other Microsoft products, click the following article number to view the article in the Microsoft Knowledge Base: Note When you apply this update, you may receive a message that resembles the following: This message indicates that you have already applied the correct update or that Windows Updates or Microsoft Update has automatically installed this update. No additional action is required to update the Windows operating system.

Update information

How to obtain this update

Microsoft Download Center

The following files are available for download from the Microsoft Download Center: Release Date: November 27, 2012

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.


The following changes were made since the previous Windows cumulative time zone update:

• Bahia Standard Time:
  Starting in 2012, Bahia Standard Time will no longer have DST.
• Azores Standard Time:
  Changes reflect the end of DST on October 28, 2012 for Azores Standard Time. These changes were released as hotfix 2769756. This update includes the changes for DST for Azores Standard Time in Windows 8 and Windows Server 2012. Additionally, this update includes the changes found in hotfix 2769756. The new rules for DST for 2013 and onwards were released as part the October 2012 cumulative time zone update in update 2756822.
• Fiji Standard Time:
  The government of Fiji has announced new DST rules for 2012 through 2013. DST starts at 2:00 A.M. on Sunday October 21, 2012 and ends at 3:00 A.M. on Sunday January 20, 2013. This update applies to Windows 8, Windows Server 2012, Windows 7, Windows Server 2008 R2 and down. Additionally, the changes that are included in the October 2012 cumulative time zone update that is described in update 2756822 are found in this update.
• Jordan Standard Time:
  Changes the UTC offset for Jordan Standard Time from (UTC+2) to (UTC+3). Therefore, the display name of the time zone is changed to (UTC+03:00) Amman. From 2013 onwards, Jordan Standard Time will no longer have DST.

The time zone changes are summarized in the following table:

Prerequisites

Windows XP

To apply this update, you must be running Windows XP Service Pack 3 (SP3). For more information about how to obtain a Windows XP service pack, click the following article number to view the article in the Microsoft Knowledge Base:
Windows Server 2003

To apply this update, you must be running Windows Server 2003 Service Pack 2 (SP2). For more information about how to obtain a Windows Server 2003 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
Windows Vista and Windows Server 2008

To apply this update, you must be running Windows Vista Service Pack 2 (SP2) or Windows Server 2008 SP2.

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:
  For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
 
Windows 7 and Windows Server 2008 R2

No prerequisites are required to apply this update. The same package installs both on the RTM version as well as the Service Pack 1 versions of Windows 7 and Windows Server 2008 R2. For more information about how to obtain a Windows 7 or a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
 
Windows 8 and Windows Server 2012

No prerequisites are required to apply this update.

Windows Embedded Standard 7

No prerequisites are required to apply this update. The same package installs both on the RTM version as well as the Service Pack 1 versions of Windows Embedded Standard. For more information about how to update a Device to Windows Embedded Standard 7 SP1, go to the following Microsoft website:

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update replaces the updates that are described in KB 2633952 and in KB 2756822. For more information about these KB articles, click the following article numbers to view the articles in the Microsoft Knowledge Base: Note You can install this cumulative update rollup even after you have installed any of the listed previously released updates.