title: DateTimeField without time
body: <pre><code>class Data(models.Model):
      time = models.DateTimeField()
  </code></pre>
  
  <p>I have in my variable:</p>
  
  <pre><code>var = 2013-01-17 17:30
  
  Data.objects.filter(time=var)
  </code></pre>
  
  <p>I need all Data from this day(2013-01-17 - without time)</p>
  
  <p>How to do?</p>