title: How many weeks are in each month of the year 2015 and 2016 based on ISO standard?
body: <p>This year 2014 has:</p>
  
  <pre><code>Jan-4
  Feb-4
  Mar-5
  Apr-4
  May-4
  Jun-5
  Jul-4
  Aug-4
  Sep-5
  Oct-4
  Nov-4
  Dec-5
  </code></pre>
  
  <p>How to calculate this for any given year?</p>