title: Date in Milliseconds with getTime()
body: <p>I am looking to output dates in milliseconds but it is not working.</p>
  <p>In the HTML file I have:</p>
  <p>{{product.date_expiration}} : // which output ==&gt; 2018-01-13T12:22:06.165Z</p>
  <p>{{CurrentDate}} : // which output ==&gt; &quot;2017-02-10T13:18:58.339Z&quot;</p>
  <p>with:</p>
  <pre><code>date_expiration: {type: Date}
  </code></pre>
  <p>and :</p>
  <pre><code>{CurrentDate}}: {type: Date}
  </code></pre>
  <p>when I try to get dates in milliseconds:</p>
  <p>{{product.date_expiration.getTime()}} ==&gt; does not output anything</p>
  <p>and:</p>
  <pre><code>{{CurrentDate.getTime()}} ==&gt; output 1486733469830
  </code></pre>