<!DOCTYPE html>
<html>
<body>
Birthday: <input type="datetime" id="myDatetime">
<p>Click the button to set the datetime field to read-only.</p>
<p><strong>Tip:</strong> To see the effect, try to type something in the datetime field before and after clicking the button.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> input elements with type="datetime" do not show as any datetime field/calendar in any of the major browsers, except Safari.</p>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("myDatetime").readOnly = true;
}
</script>
</body>
</html>