Windows Time modification 12/31/1969???

I'm opening the files in a directory, and trying to find the most recent modification date. The problem is that I'm getting the date of 12/31/1969 for all my files, and when I try to print out the modification timestamp from filemtime directly I get nothing. If you look at the code you can see. Nothing is printed out at print $fileDate. It is a windows NT system could this be the problem. Having troubles with the UNIX timestamp? while (false!=($file = readdir($handle))) { // read all files in dir if ($file != "." && $file != "..") { // only if file is not . or .. $fileDate = filemtime($file); // get date from file $newDate = filemtime($newFile); // get date from newFile print $fileDate; if ($newDate < $fileDate) { // if file is newer $newFile = $file; // replace newFile with newer file } } }