title: Wordpress PHP shortcode returning Unix date stamp. How to convert to dd/mm/yyyy?
body: <p>I'm using a page builder on my Wordpress site which allows editing of the PHP. 
  On a page I wanted to add a custom field which shows an expiry date set by a plugin.</p>
  
  <p>I did this by adding:</p>
  
  <pre><code>&lt;?php echo do_shortcode("[oxygen data='meta' key='_expiration-date']"); ?&gt;
  </code></pre>
  
  <p>This works, but the date and time returned is in a Unix format(?) so it looks like: 
  <strong>1538329800</strong></p>
  
  <p>Is there a way to convert this number to a proper text output to be displayed on pages?</p>