If your Smartphones (Read: Back to the future with mini-Y2Kwere ) were affected with the Daylight saving time that happened today you will need to download and install the Daylight Saving Time Update Tool for Windows Mobile patch from Microsoft.
The patch must be installed on your Smartphones to resolve clocks and Microsoft Outlook calendar appointments on your Smartphone to display the correct times. The patch will ensure the appointments on your Smarphones are accurate. If you regularly synchronize your Smartphones with your PC, you’ll need to update Microsoft Windows and Microsoft Outlook before installing the Smartphones Daylight Saving Time patch.
The full instructions are outlined under Smartphones Updates for Daylight Saving Time.
You will need to ensure you follow the step by step instructions in the order mentioned on the above link.