title: How to change the format of date in a dataframe?
body: <p>I have a date column in a dataframe in the format <code>yyyy/mm/dd</code> like this:</p>
  
  <pre><code>Date
  2016/08/22
  2016/08/10
  2016/08/08
  ...
  </code></pre>
  
  <p>How do I convert it into <code>dd/mm/yyyy</code>format??</p>