title: Days, hours, minutes, seconds between two dates
body: <p>I have two dates, one less than the other.  I want to create a string such as this one</p>
  
  <p>"0 days, 0 hours, 23 minutes, 18 seconds"</p>
  
  <p>representing the difference between the two dates.  How can I get these elements of this string?</p>