To check NTP server pointing  :

w32tm /query /peers

or 

w32tm /query /status

**If the output shows that the peer list is empty and state pending, the server is not using NTP.

Update the peer list:

w32tm /config /update /manualpeerlist:time.windows.com /syncfromflags:manual /reliable:yes

Force sync:

w32tm /resync /rediscover

Check if the server is now using NTP:

w32tm /query /source

Setup Pointing NTP Server (need run on End user PC / GPO)

NET TIME \\YourNTPServer /SET /YES