Observance of "Daylight Saving Time" and "Summer Time," or the shifting of clocks by one hour, does not occur uniformly in the world. Some countries and territories follow a set of standard rules for the start and end dates of Daylight Saving Time while others follow their own calendar. You can find more information about exact dates and the potential impact to your time zones in the Changes in Windows Mobile Daylight Saving Time section.In the MyExperience tool, time is critical. It can affect when you trigger events (e.g., self-report surveys), the timstamp that the collected data is annotated with, etc. Thus, it is crucial that you install this update from Microsoft on your Windows Mobile devices before you begin your field studies.
For more information, visit the Windows Mobile Updates for Daylight Savings Time page.