August 2012 cumulative time zone update for Windows operating systems

Summary

This update supersedes and replaces update 2633952, which was released in December 2011. All additional time zone changes released as hotfixes after update 2633952 are incorporated in this update.

If you have already deployed update 2633952, read the descriptions of the specific time zone changes that are addressed in this article to determine whether you must deploy this update immediately. If systems are not directly affected, you can schedule deployment at the next available opportunity.

We recommend that you deploy the most current Windows cumulative time zone update to guarantee the consistency of the time zone database on all systems.

Important

• Before you apply the update that is described in this article, be aware of potential issues that may affect Microsoft Outlook. For more information about these issues, view the article in the Microsoft Knowledge Base:
  

  931667 How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook

• If you are running Microsoft Exchange Server in an Information Technology (IT) environment, you must take additional measures to guarantee the correct operation of Exchange Server. For more information about the Exchange daylight saving time (DST) update, view the article in the Microsoft Knowledge Base:

  941018 How to address daylight saving time by using the Exchange Calendar Update Tool

• Cumulative time zone updates contain only data that has changed for a specific region or that was added to maintain parity with other operating system versions. Therefore, if a time zone key is deleted, some original values may not be restored after you apply the cumulative zone update.
  
  We do not recommend that you delete any registry keys that are related to time zones. On a computer that has incomplete time zone keys, first restore the time zone keys from a known good backup. Then, apply the update.
  
  

More Information

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

The update that this article describes 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, visit the following Microsoft website: 

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

For more information about how daylight saving time changes may affect other Microsoft products, click the following article number to view the article in the Microsoft Knowledge Base:

914387 How to configure daylight saving time for Microsoft Windows operating systems

Please note: These packages are affected by the issue that is described in Microsoft Security Advisory 2749655. In this issue, the digital signature on files that are produced and signed by Microsoft expire prematurely, and are therefore no longer available. The latest packages for these DST transitions are now available for download in the following Microsoft Knowledge Base article:

2756822 October 2012 cumulative time zone update for Windows operating systems

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

• E. Europe Standard Time:
  The display name for this time zone has been updated to "(UTC+2:00) E. Europe." from "(UTC+2:00) Nicosia."

• Azores Standard Time:
  Changes the 2013 DST start time to occur at 12:00:00 AM on the last Sunday of March and end time to occur at 01:00:00 AM on the last Sunday of October.

• Caucasus/ Armenian Standard Time:
  As previously described in the following blog (http://blogs.technet.com/b/dst2007/archive/2012/03/22/armenia-cancels-dst.aspx) the government of Armenia has cancelled Daylight Saving Time and will stay on permanent “winter time”. That article suggested that users move to a "workaround time" of Russian Standard Time. This Windows update makes the move permanent by removing the DST rule for the time zone “(UTC+4:00) Yerevan”

• Pacific SA Standard Time:
  As previously announced in Microsoft Knowledge Base article 2681116, Chile has extended the 2012 Daylight Saving Time. The Chilean government has changed the 2012 DST start date to occur on the first Saturday of September 23:59:59.999 and end date to occur on the last Saturday of April at 23:59:59.999.

• Morocco Standard Time:
  As previously announced in Microsoft Knowledge Base article 2698707, Morocco will switch to daylight saving time from 2012 onwards. The Moroccan government has changed the 2012 DST start date to occur on the last Sunday of April and end date to occur on the last Sunday of September. During the time of Ramadan, DST will be interrupted and from July 20 to August 19, 2012, time will be turned back to standard time. The transitions reflecting the start and end of Ramadan are not included in this KB, and can be installed by using the Fix-It solutions provided in Microsoft Knowledge Base article 2698707.

• Samoa History Correction:
  Samoa Time zone changes were included in Microsoft Knowledge Base article 2633952 (December 2011 Cumulative time zone update). As a result of this update, the entire 2011 calendar was updated to (UTC+13). This update reverts the 2011 calendar to (UTC-11) while the 2012 and future calendars will continue to be (UTC+13). The history correction has also been contained in KB 2657025.

• Russian History Correction:
  Russian Time zone changes were included in Knowledge Base article 2570791 (August 2011 Cumulative time zone update). As a result of Russia canceling DST and staying on permanent "summer time," the entire 2011 calendar was updated to summer time. This update changes the 2011 calendar to show winter time before March 27, 2011 while DST was still in effect. The history correction has also been contained in KB 2657025.

The time zone changes are summarized in the following table.

The following is a complete list of additional display name changes that are implemented in these packages for specific locales.