Time not correct in our domain

Our client feed back said that the time in their desktop is not correct and 15min faster then internet time.I check in our domain controller and confirm that ,what they said is right .I check on the domain controller time server actually is get from the source from window as usual and i try to manual change to reduce 3 min some of the user is start complaining can not access to email server already.Please advice how to change back the time correctly without user interruption.
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What kind of server is this? Is this virtual server or physical server?
Seth SimmonsSr. Systems AdministratorCommented:
configure the domain controller that has the PDC emulator role as the authoritative time server then all other domain systems will get time from that and adjust accordingly

How to configure an authoritative time server in Windows Server

you can use pool.ntp.org for your external time source


if this is a virtual machine, make sure the host is not configured to sync with the guest

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Windows Server 2008

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