<!DOCTYPE html>
<html>
<body>
Date: <input type="datetime-local" id="myLocalDate" value="2014-11-16T15:00:33">
<p>Click the button to increment the value of the datetime field by 10 minutes (each time you click).</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> input elements with type="datetime-local" do not show as any datetime field/calendar in Firefox.</p>
<script>
function myFunction() {
document.getElementById("myLocalDate").stepUp(10);
}
</script>
</body>
</html>