changing the local datetime of a smart device

Question

i have a smart device application which interacts with the web service for the data. smart device and the host machine on which web service is running should be having the same date time. So i need a to have clock synchronization for smart device and the host machine. Is there a direct way of doing this. May be some direct function in c#. Or do i need to use Windows CE API. I came across one such API i.e SetLocalTime which uses the structure SYSTEMTIME. Any idea how to use this API in smart device application, which DLL i will find this API. thanks