Windows Time Sync

use w32tm to sync you master domain controller with NTP

Test to make sure you can access the server
w32tm /stripchart /computer:0.us.pool.ntp.org
w32tm /stripchart /computer:1.us.pool.ntp.org
w32tm /stripchart /computer:2.us.pool.ntp.org
w32tm /stripchart /computer:3.us.pool.ntp.org

Configure your servers
w32tm /config /update /syncfromflags:manual /reliable:yes /manualpeerlist:"0.us.pool.ntp.org,0x8 1.us.pool.ntp.org,0x8 2.us.pool.ntp.org,0x8 3.us.pool.ntp.org,0x8"

Check your servers status
w32tm /query /peers

Another check to see where you are
w32tm /query /status

Then you can check the status
w32tm /monitor

If you want to check your server to make sure it replies:
w32tm /stripchart /computer:0.us.pool.ntp.org