Collection of computers with the wrong time.

I'd like to bring this one back up. I'm seeing a lot of older computers which have been down in our schools, unplugged while they wax. When they come back up, the time is off and sometimes they are not syncing for some reason. I created a command to deploy, net time /set /yes which generally works. I would like to find a way to compare the time between the PDC and any other computers on the network and show the ones that are off significantly. Can this be done in some way with the %TIME% variable?