SK TSync is a free Windows Mobile (both Standard and Professional) time synchronization application from SKKV Software (makers of SKTools) that allows you to sync time on your device.
Time synchronization (adjusting time on with the help of time servers) on your Device is done automatically in one of the following scenarios: you connect your device to the PC via ActiveSync/WMDC or you are frequently using GPS software that sets your time according to satellite time.
All you need to do is download and install the CAB. Launching the application will use your internet connection (let it be WiFi, Activesync/WMDC shared or data connection) to sync time on your device with one of the predefined NIST and SNTP time servers existing in the application. There are also parameters you can use for automation (please check its website).