Time Synchronization in Windows 2000 Environment

I have a windows 2000 server and all the clients running win 2k pro, I also have a novell 4.22 server.

The setup is a typical client server environment wherein the client log into the domain as well as the novell server. The problem is with time sync, all the workstations do not sync the time with the server. The novell server also does not seem to have the sync the time with the server. Is there any way wherein I can force the clients as well as the novell server to sync the time with win 2000 server. Pl dont tell me to install any third party software on the clients, as the number of clients is a lot.

Could u please help me. thanks (NN)