code: public static void printTimeDifference(final Calendar pStartCalendar, final Calendar pEndCalendar) {
      printTimeDifference(pStartCalendar, pEndCalendar, System.out);
    }
docs: Prints out the difference between to calendar times two {@code System.out}.
  The first calendar object is subtracted from the second one.
  <p>
  @param pStartCalendar the first {@code java.util.Calendar}.
  @param pEndCalendar the second {@code java.util.Calendar}.
  @see <a href="http://java.sun.com/products/jdk/1.3/docs/api/java/util/Calendar.html">{@code java.util.Calendar}</a>