title: Retrieve firebase server time without setting it first
body: <p>Is there a way to obtain the server time without having to first set it? For example, I can simply do:</p>
  
  <pre><code>curl -X PUT -d '{".sv": "timestamp"}' https://SampleChat.firebaseIO-demo.com/servertime.json
  </code></pre>
  
  <p>which will return the server time, but this sets the value <code>servertime</code> within my firebase instance. I should note that I'm using the REST API.</p>