Update External NTP on PDC

1. Run CMD Prompt as ADMIN

   w32tm /config /manualpeerlist:0.pool.ntp.org,0x8 /syncfromflags:MANUAL 
   

2. Run Powershell as ADMIN

   Stop-Service w32time 
   Start-Service w32time 
   w32tm /resync
   

3. Logout and Log back in

Other Sources
* http://www.thewindowsclub.com/windows-time-service-not-working-synchronization-fails-error