If the machines are members of an Active Directory domain the time synchronization should happen automatically and you would be best served to investigate why the normal domain time synchronization mechanisms are failing.
If they're not domain members I'd recommend configuring each machine with an NTP time source (such that they're not dependent on each other for time sync). If you've got an on-site NTP server then use it but, if not, something like an "ntp.org" source is probably reasonable. You could get away with something like:
w32tm /config /update /manualpeerlist:"0.pool.ntp.org,0x8 1.pool.ntp.org,0x8 2.pool.ntp.org,0x8 3.pool.ntp.org,0x8" /syncfromflags:MANUAL