TIme stamp on file

Hi Luvers, is it possible for a file to be written to and the time stamp not changed? Specifically, is it possible for a swap file to be changed and the time stamp not changed? OR if the time stamp on a swap file has not changed for several days, does that mean that the system has not used swap for that time, since this is the only swap space available? or could it be that the kernel process that initiates swap does not update the filesystem fully? Thanks Daniel.