On the PDC for the Domain:
w32tm /config /manualpeerlist: <peers> /syncfromflags:manual /reliable:yes /update
Get <peers> from here.
On all the servers and in login scripts:
w32tm /config /syncfromflags:domhier /update
Net Stop w32tm
Net Start w32tm
Reference:
Configure w32tm on PDC: Microsoft Technet
Configure w32tm [...]