Managing the Windows Time Service
http://technet.microsoft.com/en-us/library/cc816712(WS.10).aspx
Configure the Time Source on the Forest PDC emulator
w32tm /config /manualpeerlist:"ntp0.ja.net ntp1.ja.net uk.pool.ntp.org" /syncfromflags:manual /reliable:yes /update
Configure the Time Source on all domain members
w32tm /config /syncfromflags:domhier /update
