title: how to convert date to other format with special chars
body: <p>I'd like to convert date to such format:</p>
  
  <blockquote>
    <p>2017%2C01%2C02</p>
  </blockquote>
  
  <p>was trying to do this using:</p>
  
  <pre><code>date.strftime('%Y%2Cm%2Cd')
  </code></pre>
  
  <p>But is doesn't work.</p>
  
  <p>Can anyone explain what I am doing wrong and how to solve it ?</p>
  
  <p>Thanks,</p>