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).