The August 2013 DST Cumulative Update for Windows Operating Systems has been published on Microsoft Download Center. It contains the following changes: 

  • Libya Standard Time:

            New DST starts on the last Friday of March at 2:00 A.M., and ends on the last Friday of October at 2:00 A.M. This new DST rule is introduced in 2013 and the new dedicated time zone is also added (UTC+1 Tripoli). 

  • Israel Standard Time:

            New DST starts on the Friday before the last Sunday of March, and ends on the last Sunday of October at 2:00 A.M. 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 new DST rule is applicable to 2013 only. 

  • Paraguay Standard Time:

            New DST ends on March 23, 2013. This change incorporates the shortened DST rules for Paraguay in 2013.

  • West Asia Standard Time:

            This change adds Ashgabat to the display name of the “West Asian Standard Time” time zone.

  • 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 was shipped in June 2013 (KB 2860495).

For more information on these adjustments, refer to this Microsoft Knowledge Base article: http://support.microsoft.com/kb/2863058.