Make sure you “Fall Back” next week: Windows Mobile and Daylight Saving Time

Yesterday, October 28th, would have been the timeframe for the US Daylight Savings Time changeover under prior rules.  The new rules call for the US and Canadian DST “Fall Back” to occur in the early morning of Sunday, November 4. 

A recent update was posted to our DST & TZ hot topics page which details impacts to some users of certain Windows Mobile devices, who experienced an early changeover.   A copy of that posting is found below – please refer to the information on the page and contact your mobile operator’s customer support line if you experience any difficulties. 

Windows Mobile Devices

In observance of the various Daylight Saving Time (DST) and time zone changes, Microsoft has been working closely with customers, partners and others in the industry to help ensure a smooth and seamless transition.  Although updates have been made available for mobile devices running Windows Mobile software, some end users may not have the information needed or followed the steps necessary to apply those patches.  The correct end to DST for 2007 in North America is November 4th. 

Mobile devices for users who did not update may have experienced the “Fall Back” in North America on October 28th, as some user’s mobile devices and their calendars may be incorrectly early by one hour for the following week if the appropriate updates are not applied. Microsoft recommendations that those customers needing to update should follow the instructions on for updating their devices.

Generally it seems that some new devices may not have the latest update for the 2007 DST and TZ rules.  My wife has a Cingular (now AT&T) 8525 Pocket PC Phone that she received late this summer as a replacement for a unit still under warranty, and the phone came loaded with the fix already installed.

For the latest news and customer guidance, please visit Microsoft’s Hot Topics web page at

Tags: Microsoft, Daylight Saving Time, Daylight Savings Time, DST, Windows Mobile, Cingular 8525. 4,020,000; 10,600,000; 649,000+