Java date convert: long milliseconds to string iso 8601

1305637849064 to 2011-10-10T07:46:56.394+0000
Time to covert is 1ms

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;


public class MyDateUtilStuff {

   private static DateFormat ISO_8601_DATE_TIME = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ");
   static {
      ISO_8601_DATE_TIME.setTimeZone(TimeZone.getTimeZone("UTC"));
   }
   
   public static void main(String[] args) {
      
      String string = "1305637849064";

      long startTime = System.currentTimeMillis();
      
      Date date = new Date();
      Calendar calendar = Calendar.getInstance();
      calendar.setTimeInMillis(Long.parseLong(string));
      String outDate = ISO_8601_DATE_TIME.format(date);
      
      long time = System.currentTimeMillis() - startTime;
      
      System.out.println(">>> alexey: MyDateUtilStuff.main ii = " + time);
      
      System.out.println(">>> alexey: MyDateUtilStuff.main outDate = "
            + outDate);
   }

}