title: ko.toJSON is always making my Date -3 hours
body: <p>I have a <code>momentjs</code> date object in the format <code>YYYY-MM-DD HH:mm</code> but when i use <code>ko.toJSON</code> the hour is <strong>always</strong> -3 hours. </p>
  
  <p>For example, if i have <code>date</code> like <code>2017-06-03 13:00</code> before <code>ko.toJSON</code> after that i get <code>2017-06-03 10:00</code> no matter what the hour is, its always -3 hours. What can be the problem?</p>
  
  <p>I get the date from a <code>datepicker</code> like this:</p>
  
  <pre><code>.on('changeDate', function (e) {
         self.objCurrentResource().SelectedDate(moment(e.date).format("DD-MM-YYYY"));
         self.ConfirmData().Date(moment(e.date).format("YYYY-MM-DD"));
     });
  </code></pre>
  
  <p>and then when the time is selected i concatenate it like this:</p>
  
  <pre><code>self.ConfirmData().Date(moment(self.ConfirmData().Date() + " " + data.name));
  </code></pre>
  
  <p><code>data.name</code> is a <strong>string</strong> containing the selected <code>HH:mm</code> and i get the results i want. </p>