title: Use Unix timestamp in Doctrine Timestampable
body: <p>How do I use Unix timestamps with the Doctrine Timestampable behavior? I found the following code snippet <a href="http://maxgarrick.com/effective-development-using-doctrine-orm/" rel="noreferrer">here</a>, but I'd rather not manually add this everywhere:</p>
  
  <pre><code>$this-&gt;actAs('Timestampable', array(
  'created' =&gt; array('name' =&gt; 'created_at',
      'type'    =&gt;  'integer',
      'format'  =&gt;  'U',
      'disabled' =&gt; false,
      'options' =&gt;  array()),
  'updated' =&gt; array('name'    =&gt;  'updated_at',
      'type'    =&gt;  'integer',
      'format'  =&gt;  'U',
      'disabled' =&gt; false,
      'options' =&gt;  array())));
  </code></pre>