Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<input type="datetime-local" id="myLocalDate">

<p>Click the button to set the local 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-local" are not supported in Internet Explorer or Firefox.</p>

<script>
function myFunction() {
    document.getElementById("myLocalDate").readOnly = true;
}
</script>

</body>
</html>