Prevent users from changing time zone settings

We are currently running Windows server 2003, with all XP clients. I need to lockout the users from being able to change their time zone settings and want to use group policy to do so. The only problem I'm having is that  all our users domain accounts are in the local machine admin group (we can't change this, as it is a requirement that users of one of our specific applications be administrators in order to use this app). Is there any way to lock them out of Time Zone properties (or grey it out) at the computer level and not the user level?
KzwijaczAsked:
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stronglineCommented:
it is in computer level already.

it's a user rights assignment
computer config\windows settings\security settings\local policies\user rights assigment
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KzwijaczAuthor Commented:
I did make the change in the user rights assignment area under computer config, and modified the 'change system time properties'. However, on the workstations users were still able to modify the properties. We have all users locally on their machines in the admin group (becuase of a specific application we use, we cannot change this) so I'm thinking this is the problem.
Any suggestions, or is there a different policy I need to change? Someone had suggested there may be a script I could use for this.
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