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public void givenTwoDatesBeforeJava8_whenDifferentiating_thenWeGetSix()
  throws ParseException {
  
    SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy", Locale.ENGLISH);
    Date firstDate = sdf.parse("06/24/2017");
    Date secondDate = sdf.parse("06/30/2017");
 
    long diffInMillies = Math.abs(secondDate.getTime() - firstDate.getTime());
    long diff = TimeUnit.DAYS.convert(diffInMillies, TimeUnit.MILLISECONDS);
 
    assertEquals(diff, 6);
}