title: Firebase query by date range
body: <p>My firebase data looks something like this:</p>
  
  <pre><code>{
    "lambeosaurus": {
      "date" : 1420753443,
      "length" : 12.5,
      "weight": 5000
    },
    "stegosaurus": {
      "date" : 1429053443,
      "length" : 9,
      "weight" : 2500
    }
  }
  </code></pre>
  
  <p>I am looking for a way to filter the dates using a custom date range.
  I've seen some examples online where they have queried for date, but the timestamp has always been the key which isn't possible in my case.</p>
  
  <p>The relevant section is the documentation can be found here:
  <a href="https://www.firebase.com/docs/web/guide/retrieving-data.html#section-queries">https://www.firebase.com/docs/web/guide/retrieving-data.html#section-queries</a></p>
  
  <p>It's important that real time updating is still supported. I also only want to determine the number of all the items that fit the criterion. I am not interested in the data point for each node.</p>