Neat little script that will give you a list of all modified files in a certain folder after a certain date:
$filelist = Array();
$filelist = list_dir("d:\\my_folder");
for($i=0;$i<count($filelist);$i++){
 $test = Array();
 $test = explode("/",date("m/d/Y",filemtime($filelist[$i])));
//example of files that are later then
//06/17/2002
 if(($test[2] > 2001) && ($test[1] > 16) && ($test[0] > 5)){
 echo $filelist[$i]."\r\n";
 }
 clearstatcache();
}
function list_dir($dn){
 if($dn[strlen($dn)-1] != '\\') $dn.='\\';
 static $ra = array();
 $handle = opendir($dn);
 while($fn = readdir($handle)){
 if($fn == '.' || $fn == '..') continue;
 if(is_dir($dn.$fn)) list_dir($dn.$fn.'\\');
 else $ra[] = $dn.$fn;
 }
 closedir($handle);
 return $ra;
}