title: cakePHP timestamp field is not saved properly
body: <p>I have a  record with a timestamp field, which its default is defined as current_timestamp in the mySql db.
  I use the code:</p>
  
  <pre><code>$this-&gt;Ad-&gt;Click-&gt;create();
  $this-&gt;Ad-&gt;Click-&gt;set('ad_id',  $id);
  $this-&gt;Ad-&gt;Click-&gt;save($this-&gt;data);
  </code></pre>
  
  <p>after the record is saved, the timestamp field stays 0000-00-00 00:00:00.
  why is that?</p>
  
  <p>of course, i understand that i can use php time functions to set the field value, or mySQL functions, in a query.. but i prefer the 'satandard way'.</p>