title: GQL SELECT by date
body: <p>I have this model:</p>
  
  <pre><code>class Entry(db.Model):
      title = db.StringProperty()
      url = db.URLProperty()
      date = db.DateTimeProperty(auto_now=True)
      image = db.URLProperty()
      weight = db.IntegerProperty()
      category = db.StringProperty()
      desc = db.TextProperty()
  </code></pre>
  
  <p>I have lots of entries each day, how do I SELECT only today's entries by using GGL ?
  since query like this does not return any results ( but I know that there is results ):</p>
  
  <pre><code>SELECT * FROM Entry WHERE category = 'news' and date = '2012-03-12' ORDER BY weight DESC
  </code></pre>