<!DOCTYPE html>
<html>
<body>
<input type="datetime-local" id="myLocalDate" readonly>
<p>Click the button to find out if the local datetime field is read-only.</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>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myLocalDate").readOnly;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>