Client Won't be Sync with Server Time, Any Possibilities ?

Hi,

I need My server time won't be sync with AD time, I need that server 10 min increase with AD time for some Application purpose. Any possibilities ? we have only one NTP server. But changing NTP server time that is not possible. Once we change the server time automatically it will come with AD time. Let me know any possibilities. 

Please reply ASAP.

Thanks in Advance. 

Hari