title: Get the difference between dates in terms of weeks, months, quarters, and years
body: <p>I have two dates let´s say <code>14.01.2013</code> and <code>26.03.2014</code>.</p>
  
  <p>I would like to get the difference between those two dates in terms of weeks(?), months(in the example 14), quarters(4) and years(1).</p>
  
  <p>Do you know the best way to get this?</p>