title: MomentJS : Issue subtracting minutes
body: <p>This is my code that is deployed on Parse.com CloudCode :</p>
  
  <pre><code>var now = new Date()
  var then = moment(now).subtract(20, "minutes").toDate()
  
  console.log(now)
  console.log(then)
  </code></pre>
  
  <p>Why does <code>now === then</code> ?</p>
  
  <p>What am I doing wrong ?</p>