title: moment-timezone: unix timestamps with timezones
body: <p>i am using momentjs.com with nodejs and im trying to get unix timestamps for multiple timezones, but sadly the the output is not correct.</p>
  
  <p>code:</p>
  
  <pre><code>var moment = require('moment-timezone');
  
  var berlin = moment.tz('Europe/Berlin').unix();
  var angeles = moment.tz('America/Los_Angeles').unix();
  var london = moment.tz('Europe/London').unix();
  
  console.log(berlin);
  console.log(angeles);
  console.log(london);
  </code></pre>
  
  <p>output:</p>
  
  <pre><code>1472241731
  1472241731
  1472241731
  </code></pre>