Moment Tests

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.14.1/moment.js"></script>
<p id="date">

</p>

JavaScript

var dateElement = document.getElementById("date");
dateElement.innerText = moment("2017-09-11T18:00:00.000+0100").getTimezoneOffset();