Whenever you experience a drift in your servers, below are the steps to synchronize it with an external time service in your time zone.
On how to enable and disable Linux systems clock synchronization with a Network Time Protocol (NTP) Server, see
In Windows, here is a simple command that can be run to achieve this.
C:\>w32tm /config /manualpeerlist:ntp1.tpg.com.au /syncfromlags:manual /reliable:yes /update
Note: It is recommended to have a dedicated server (Domain Controller) synchronise their time from from an external time source and then all other servers synchronise from this server.