ics vcs Kalender Import. Fehler bei mehrtägigen Terminen?

<?php

  $kat = $_GET["kat"];  
  $nr = $_GET["nr"];  
 
  $kat = "data/".$kat.".dat";  
  
  $readfile = file($kat);
  for ($i=0; $i<count($readfile); $i++)
  { 
  	if($i == $nr - 1)
	{
		 $fields = split(";",$readfile[$i]);  
		 
		 $ics .= "BEGIN:VCALENDAR\n";  
		 $ics .= "PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN\n";  
		 $ics .= "METHOD:PUBLISH\n";  
		 $ics .= "VERSION:2.0\n";  
		 $ics .= "BEGIN:VEVENT\n";  
		 $ics .= "DTSTART;VALUE=DATE:".trim($fields[5])."".trim($fields[3])."".trim($fields[4])."\n"; // Y  
		 if($fields[6] == "")  
		 {
		   $ics .= "DTEND;VALUE=DATE:".trim($fields[5])."".trim($fields[3])."".trim($fields[4])."\n";  
		 }
		 else
		 {
		   $ics .= "DTEND;VALUE=DATE:".trim($fields[8])."".trim($fields[6])."".trim($fields[7])."\n";  
		 }	
		
		 if($fields[10] != "")  
		 {
		   $ics .= "LOCATION:".$fields[10]."\n";  
		 }
		 $ics .= "TRANSP:TRANSPARENT\n";  
		 $ics .= "SEQUENCE:0\n";  
		 $ics .= "UID:nummer".trim($fields)."\n";  
	     $ics .= "DTSTAMP:".date(Y)."".date(m)."".date(d)."T".date(H).date(i).date(s)."Z\n";  
		 $ics .= "DESCRIPTION:".$fields[9]."\n";  
		 $ics .= "SUMMARY:".$fields[9]."\n";  
		 $ics .= "PRIORITY:5\n";  
		 $ics .= "X-MICROSOFT-CDO-IMPORTANCE:1\n";  
 		 $ics .= "CLASS:PUBLIC\n";  
		 $ics .= "BEGIN:VALARM\n";  
 		 $ics .= "TRIGGER:-PT15M\n";  
  		 $ics .= "ACTION:DISPLAY\n"; 		  
		 $ics .= "DESCRIPTION:Reminder\n";	   
		 $ics .= "END:VALARM\n";  
		 $ics .= "END:VEVENT\n";  
		 $ics .= "END:VCALENDAR\n";  
	}
  }


header("Content-type: application/octet-stream");  
header("Content-Disposition: attachment; filename=test.ics");  
echo $ics;
?>

DTSTART;VALUE=DATE:20082009
DTEND;VALUE=DATE:20082109