title: Moment.js internal object what is "_d" vs "_i"
body: <p>I am using Moment.js and manipulating a date using <code>moment.hour(xx)</code> <code>moment.minute(xx)</code>.</p>
  <p>When i <code>console.log</code> the moment i see that the object contains a <code>_d</code> and <code>_i</code>:
  the <code>_d</code> contains the correct changed <code>moment.hour()</code> or <code>moment.minute()</code> changes however the <code>_i</code> object contains the original?</p>
  <pre><code>k {_isAMomentObject: true, _i: Thu Dec 11 2014 20:34:00 GMT+0200 (South Africa Standard Time), _isUTC: false, _pf: Object, _locale: j…}
  _d: Thu Dec 11 2014 14:00:00 GMT+0200
  _i: Thu Dec 11 2014 20:34:00 GMT+0200
  </code></pre>
  <p>Could anyone enlighten me?</p>