Get a "real" NTP server whos only job is to keep track of time. Get the time from fx GPS signal, and set all the other machines to get the time from it including your windows machines.

Why ? Because you do not want the Windows machine whos crystal is less than perfect to run all your timing needs, when you correct it to the "real" time it might do timejumps and then your logs and timestamps will be a mess and you dont want that. And you get a reliable timesource, good among otherthings if you ever need to go to court or do forensics and so on.

If you dont want that solution, then there are some NTP servers on the net you can get your time from. Just make shure that the software you are using doesnt do time jumps.

but in short increments catch up to the real time.

Good luck