How to configure DC to sync with external NTP

net stop w32time

w32tm /config /syncfromflags:manual /manualpeerlist:”0.pool.ntp.org,0x1 1.pool.ntp.org,0x1 2.pool.ntp.org,0x1 3.pool.ntp.org,0x1″ /reliable:yes /update

net start w32time