1.First, locate your PDC Server. Open the command prompt and type: C:\>netdom /query fsmo
2.Log in to your PDC Server and open the command prompt.
3.Stop the W32Time service: C:\>net stop w32time
4.Configure the external time sources, type: C:\> w32tm /config /syncfromflags:manual /manualpeerlist:”0.pool.ntp.org, 1.pool.ntp.org, 2.pool.ntp.org”
5.Make your PDC a reliable time source for the clients. Type: C:\>w32tm /config /reliable:yes
6.Start the w32time service: C:\>net start w32time
7.The windows time service should begin synchronizing the time. You can check the external NTP servers in the time configuration by typing: C:\>w32tm /query /configuration
8.Check the Event Viewer for any errors.


Run on PDC Emulator:

netdom /query fsmo
net stop w32time
w32tm /config /syncfromflags:manual /manualpeerlist:"0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org"
w32tm /config /reliable:yes
net start w32time
w32tm /query /configuration


Run on other servers (non-PDC emulators)

w32tm /config /syncfromflags:domhier /update /reliable:no 
w32tm /resync /rediscover 
net stop w32time && net start w32time 

On the DC that you’re experiencing issues with, run the following in a command prompt (then run the above settings:

 net stop w32time
 w32tm /unregister
 w32tm /register
 net start w32time