title: timestamp format in google bigquery loses
body: <p>As per <a href="https://stackoverflow.com/questions/23707467/bigquery-node-js-timestamp-way-off">another question</a>, i've been doing this (python) to push my timestamps into bigquery (they come from a node-js app in a nr-of-miliseconds format):</p>
  
  <pre><code>e["createdOn"] = e["createdOn"] / 1000.0
  </code></pre>
  
  <p>But they end up as this:</p>
  
  <pre><code>SELECT updatedOn,TIMESTAMP_TO_USEC(updatedOn) FROM [table.sessions] WHERE session = xxxxxxx
  Row updatedOn f0_    
  1 2014-08-18 11:55:49 UTC 1408362949426000
  2 2014-08-18 11:55:49 UTC 1408362949426000 
  </code></pre>
  
  <p>I've been printing debug information, and this is their last form before being inserted with insertAll:</p>
  
  <pre><code>{u'session': 100000000000080736, u'user': 1000000000075756, u'updatedOn': 1409052076.223}
  </code></pre>