title: How to get the raw 'created_at' value in the database (not an object cast to an ActiveSupport::TimeWithZone)
body: <p>Imagine I have a Post Model. </p>
  
  <p>and one record in the database will be:  </p>
  
  <pre><code>23|title_here|content_here|2011-02-20 08:01:55.583222|2011-02-20 08:01:55.583222
  </code></pre>
  
  <p>and the last two field (<code>2011-02-20 08:01:55.583222|2011-02-20 08:01:55.583222</code>  ) are the created_at and updated_at field.  </p>
  
  <p>Then,</p>
  
  <pre><code>post = Post.find_by_id(23)
  </code></pre>
  
  <p><strong>Question</strong>: How can I get the created_at string: "<code>2011-02-20 08:01:55.583222</code>" in the data base?</p>
  
  <p>As we know, the post.created_at will return a <code>ActiveSupport::TimeWithZone</code> object, not the raw string. </p>
  
  <p>Please help :)</p>