I am no expert but at work we are on a domain and I have admin rights and can change the time on the work station. Only couldn't when I was not an admin.
If you set up a time server on your domain you can get the remotes to sync with it. Have a look here for some ideas.
right at the end it says you need to disable windows time service to be able to adjust the time and have it stay at the new time... but I think your problem is you can't even adjust the time.
edit ... are you getting ""you do not have a proper privilege level to change the system time" or similar?
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