TalkPHP - file creation date copare user load date time...

Good day to you all,
I have a piece of code which read a diredtory and return a list of txt file and display their content.
I was wondering if there would be a way of making that depending on the time the user load the page, the last created file would appear with their border a different color for 5 stage.

example:
if user load the page an hour after a file was created, border colored green...

here is my code :

PHP Code:


		
			

function drawList($list)
{  

      $thelist = ''; 
      
      $i = 0;
      foreach($list as $file=>$string)     
      {

$lines = nl2br($string);

    
$usercmt = explode("--", $file);
$messtime = substr($usercmt[1], 0, -4);
$messtimecor = str_replace("-", ":", $messtime);
$usercmtcor = strtoupper($usercmt[0]);

              $thelist .= '<div id="test">';
              $thelist .= "<div id=\"title\"><b>".$usercmtcor."</b> &agrave; ".$messtimecor."  (UTC)</div>";  
$lines=explode("\n",$lines);
foreach($lines as $key=>$line)
{  $lines[$key]="<div class=\"contentalt\" style=\"border-top:0; border-left:0; border-right:0; border-bottom:0px  padding:0; \">{$line}</div>";  }
$lines=implode('',$lines);
              $thelist .= "<div id=\"commentbg\">".$lines."</div><br/>";
              $thelist .= '</div><br/><br/>';



}

    return $thelist;

       
}

Thanks !