August 2013 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 either you have already applied the correct update or 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 Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

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.
 

General changes made by this update

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

• Libya Standard Time:
  New DST starts on the last Friday of March at 02:00, and it ends on the last Friday of October at 02:00. This new DST rules were introduced from 2013 and the new dedicated time zone was also added (UTC+1 Tripoli). This was released in January through the Microsoft Download Center (KB 2794119).
• Israel Standard Time:
  New DST starts on the Friday before the last Sunday of March, and ends on the last Sunday of October at 02:00. This new DST rule is applicable from 2013 to 2023.
• Pacific S.A. Standard Time:
  New DST ends on April 27, 2013, and starts on September 7, 2013. This change is for 2013 only. This was released in March as hotfix (KB 2821346)
• Paraguay Standard Time:
  New DST ends on March 23, 2013. This change incorporated the shortened DST rules for Paraguay in 2013. This was released in March as part of KB 2829069.
• West Asia Standard Time:
  This change adds Ashgabat to the display name. It will be introduced in all platforms as part of the August DST Cumulative Update.
• Morocco Standard Time:
  The change in the August DST Cumulative Update accounts only for History Correction after the DST 2013 Ramadan Fix it solution that is shipped in June 2013 (KB 2860495).

Time zone changes made by this update

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 must restart the computer after you install this cumulative update.