Date and Time policy

You could try adding a security group to the permissions of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time Give that group full permissions, then give the administrator group only read permissions. or better yet instead of adding the users to the local administrator group add the group they belong to to the local administrator group then as above, add the group they belong to to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time and deny that group pemissions.

I have to lecture however and tell you that your users should not be local Administrators

Well, there is a group policy for removing the clock from the system notification area, but with domain workstations Windows Time service syncs with a DC.

Here's a link which isnt gonna help much but it's my understanding the w32time service syncs with a DC on domain joined workstations. http://support.microsoft.com/kb/q224799/

You can deny access to change date and time to this group by using group policy. It will stay synchronised with DC. No problem.

u can do anything since u r a administrator just check the group policies of that group of users and and deny the date and time policy settings for that group of users

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