title: One time binding with Filter not working
body: <p>When I try one-time binding with a filter here I'm getting and invalid date error:</p>
  
  <pre><code>&lt;td&gt;1w vol:&lt;/td&gt;
  &lt;td&gt;{{ :: edit_tag.termObject.vol }}&lt;/td&gt;
  &lt;td&gt;Added by:&lt;/td&gt;
  &lt;td&gt;{{ :: edit_tag.termObject.user }}&lt;/td&gt;
  &lt;td&gt;Timestamp:&lt;/td&gt;
  &lt;td&gt;{{ :: edit_tag.termObject.time | fromTimestamp:'MMM Do YYYY'}}&lt;/td&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/opwOH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/opwOH.png" alt="enter image description here"></a></p>
  
  <hr>
  
  <p>The following works of course, however this date never changes, so I don't need to use 2-way binding with it. Is there a way to accomplish this?</p>
  
  <p><code>{{ edit_tag.termObject.time | fromTimestamp:'MMM Do YYYY'}}</code></p>
  
  <p>My filter if that helps:</p>
  
  <pre><code>.filter("fromTimestamp", function() {
      return function(timestamp, format) {
          return moment.unix(timestamp).format(format)
      }
  });
  </code></pre>