title: Elapsed time from two dates
body: <p>How to display duration time between two dates to looks like :  </p>
  
  <pre><code>A1 = 22.01.15 
  
  A2 = 25.08.16  
  
  A3 = "1y 7m 3d"
  </code></pre>
  
  <p>What code need for A3 ?</p>