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Article ID: 2526756 - Last Review: June 6, 2011 - Revision: 2.0

SYMPTOMS

As of March, 2011, the Windows Mobile cumulative update for daylight saving time (DST) December 2009 (http://support.microsoft.com/kb/977014) is the latest DST update for Windows Mobile-based devices (versions 6.5 and lower).  Any changes made to the normal schedule of DST transition times included in the December 2009 update may not be reflected accurately in these Windows Mobile-based devices.  Effectively, there may be an overlap period for some time zones when the transition into and out of DST are not accurate.  In some instances, the time on the device may be incorrect by the amount of the current DST offset, usually 1 hour, during this period. A current list of new / modified time zone information (TZI) keys is included in Microsoft KB article 914387 (http://support.microsoft.com/kb/914387) .

CAUSE

The required updates to the time zone tables have not been implemented or tested.

RESOLUTION

Depending on the functionality provided by your mobile operator, your phone may automatically adjust its time based on the mobile operator’s network.  Customers in impacted regions are advised to consult with their mobile operator regarding this functionality.  Customers may still need to manually advance or regress the time setting if the device does not automatically adjust during normal operation or in cases where the device adjusts the time inappropriately. In most cases this manual change will need to occur twice: once at the beginning of the overlap period and again at the end.

MORE INFORMATION

Microsoft will not be providing any further scheduled updates for daylight saving time (DST) for Microsoft Windows Mobile based devices (versions 6.5 and lower).  It is expected that the time information provided by the Mobile operator’s via their network is sufficient to provide the necessary transitions for these devices.

Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use (http://go.microsoft.com/fwlink/?LinkId=151500) for other considerations.

APPLIES TO
  • Windows Mobile 6 Professional
  • Windows Mobile 6 Standard
  • Windows Mobile 6 Classic
  • Windows Mobile 5.0 for Pocket PC
  • Windows Mobile 5.0 for Pocket PC Phone Edition
  • Windows Mobile 5.0 for Smartphones
Keywords: 
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