This is how to configure your primary domain controller to update time from an external source.
– Login to your primary domain controller

– Open up a command prompt/powershell window with administrative privileges
– Execute the following command to configure the domain controller to look at an external time   source: 
w32tm.exe /config /manualpeerlist:”” /syncfromflags:manual /reliable:YES /update
– Execute the following command to actually perform a time synchronization with the external source
w32tm.exe /config /update
– Execute the following command for the changes to take effect(only from powershell)
Restart-Service w32time 
That’s it !!!!!!! 

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