We have hosted a asp.net 2.0 based website on a windows 2003 server based dedicated server. Our website is functioning based on system date. For testing purpose we need to change system clock date to different date/month/year etc. But when we change this clock date , within a few minute system clock gets reset to current date and time only. There is some synchronization feature avialble in windows 2003 server. Our dedicated server is in workgroup so how to disable this time synchronization for a temporary period.

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You're right...Windows does synchronize it's time with an external server.

I think the simplest method to temporarily prevent time synchronization is to block 
the port that the computer communicates to the internet with to get the information. 
 This should be port 123 UDP.  So, use a firewall setting to block outgoing communication 
destined for this port.

Or, you can play with the w32tm utility to adjust your settings and disable time 
synchronization as described here:

http://technet2.microsoft.com/windowsserver/en/library/b43a025f-cce2-4c82-b3ea-3b95d482db3a1033.mspx?mfr=true

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