Moment.js Sandbox

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.0/locale/de.js"></script>
<div id="result"></div>
<div id="result2"></div>

JavaScript

moment.locale('de');
var result = moment().calendar();
var result2 = moment().calendar( null, {
  sameDay : '[Today], L',
});
document.getElementById('result').innerHTML = result;
document.getElementById('result2').innerHTML = result2;