I had to figure this out for a recent tweak on my Sync Tool script, not sure if it will be useful for anyone else or any other purpose but thought I'd share it. Some forum searching found a few returns on _Date_Time_CompareFileTime but I found it to be a difficult thing to get set up, now the work is done for you!
Make sure you #Include Date.au3, WinAPI.au3, and Array.au3 in your script as well.
Func _CompareFileTimeEx($hSource, $hDestination, $iMethod)
; Parameters ....: $hSou