code: public static void printTimeDifference(final long pStartTime, final long pEndTime, final PrintStream pPrintStream) {
  
      if (pPrintStream == null) {
        System.err.println(PRINTSTREAM_IS_NULL_ERROR_MESSAGE);
        return;
      }
      pPrintStream.println(buildTimeDifference(pStartTime, pEndTime));
    }
docs: Prints out the difference between two millisecond representations.
  The start time is subtracted from the end time.
  <p>
  @param pStartTime the start time.
  @param pEndTime the end time.
  @param pPrintStream the {@code java.io.PrintStream} for flushing the results.