title: Google cloud Datastore GQL - Get current datetime
body: <p>Is it possible to make a google datastore GQL query with a comparison on the current DateTime?</p>
  
  <p>Example:</p>
  
  <pre><code>select * from MY_KIND where created_at &lt; DATETIME.NOW
  </code></pre>
  
  <p>I've seen anything about that on any post or google documentation:
  <a href="https://cloud.google.com/datastore/docs/reference/gql_reference" rel="nofollow noreferrer">https://cloud.google.com/datastore/docs/reference/gql_reference</a></p>
  
  <p>I need to make an operation on data older than 30 days.</p>