The December 2010 DST Cumulative Update for Windows operating systems focuses on the following changes :

  Magadan :

    o   A new timezone has been created for Magadan. The Magadan timezone has support for Daylight Saving Time, with 2011 DST running from March to October.

    o   The existing timezone "(UTC +11:00) Magadan, Solomon Islands, New Caldonia" has been renamed "(UTC +11:00) Solomon Islands, New Caledonia".   This is only a   displayname update - the rules for this timezone have not changed. As before, this timezone does not have DST support.

   Namibia: The offset has been changed from UTC +2:00 to UTC +1:00. In addition, for 2011 and forward, the DST start date will occur in September, and the DST end date will occur in April.

  Egypt :  the 2011 DST start date is set to occur in April and the DST end-date is set to occur in September. This is provided to address cases in which 2010 Fix-its for temporary DST changes were only partially applied.

In addition to these changes, the December DST CU contains 2011 adjusted DST start and end-dates for the following timezones:

  • Israel Standard Time
  • Morocco Standard Time
  • Pacific SA Standard Time (for Chile)
  • Samoa Standard Time
  • Syria Standard Time

 For more information on these adjustments, refer to this Microsoft KnowledgeBase article:   http://support.microsoft.com/kb/2443685