To make sure your PDC is synching with an NTP server, type the following command from your DC:
w32tm /config /manualpeerlist:NTP_Server_List /syncfromflags:manual /reliable:yes /update
NTP_Server_List maybe a list of IP addresses or FQDNs, separated by commas.
In case you may need to move your FSMO roles and do not want to redo the configuration each time, you may simply run the command on all DCs.
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