title: Laravel date not allowing me to use diffForHumans
body: <p>have my table set up with a timestamp fields for created and updated at fields.</p>
  
  <p>In my model I then do this:</p>
  
  <pre><code>protected $dates = ['created_at', 'updated_at'];
  </code></pre>
  
  <p>But when calling the date:</p>
  
  <pre><code>$p-&gt;created_at-&gt;diffForHumans()
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>Call to a member function diffForHumans() on string
  </code></pre>
  
  <p>I'm pretty sure that should work. I have used the same many times before on different models etc but this just won't work.</p>