sync to a time server via script

Hello all,

I am running a handful of different Windows OS with no domain at all. These computers wake on from the NIC in the middle of the night to do a few tasks and then shut back down. What I am noticing though is that all the system clocks seem to be all different by as much as maybe 10 minutes. Ideally what I'd like is after booting up in the morning I would like to schedule a task to run a script that syncs the computers to the same time source. In this case an external since there is no domain involved. I had zero luck with the net time comand to do that.

Does anyone do this through a batch or vbs perhaps?

Thanks
nfv111