title: python : convert string to time object
body: <p>I got a string <code>date</code></p>
  
  <pre><code>date = '2014-12-18T19:00:00-07:00'
  </code></pre>
  
  <p>But I have no idea how to save this to <code>models.DateTimeField( null=True,blank=True)</code> </p>
  
  <p>Please help me how to convert this sting to datetime object 
  Thank you very much</p>