calendar/test.htm

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link rel="stylesheet" href="calendar-material.css">
<script src="calendar.min.js"></script>

<input id="x" style="margin: 50px">
<script>
Calendar.set(document.getElementById('x'));
</script>

<input id="y" style="margin: 50px">
<script>
Calendar.set(document.getElementById('y'), { selectboxes: true });
</script>