w32tm /query /source
net stop w32time
example, set to google time server:
w32tm /config /syncfromflags:manual /manualpeerlist:time.google.com
or
w32tm /config /syncfromflags:manual /manualpeerlist:"0.it.pool.ntp.org 1.it.pool.ntp.org 2.it.pool.ntp.org 3.it.pool.ntp.org"
w32tm /config /reliable:yes
net start w32time
w32tm /resync /rediscover
w32tm /query /status