title: Where are the codes inserted?
body: <p>I have this code</p>
  <pre><code>`&lt;?php 
  $date = get_field('date_of_birth');
  $birthday = new DateTime($date);
  $interval = $birthday-&gt;diff(new DateTime);
  echo $interval-&gt;y.' years old';
  ?&gt;`
  </code></pre>
  <p>and I have copied it in a template that I have created through a file &quot;archives.php&quot;
  but it really doesn't work for me, where exactly should I put this code?
  thanks in advance</p>