Tryit Editor v2.7

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

<form id="myForm">
A date control: <input type="datetime" id="myDatetime">
</form>

<p>Click the button to return the id of the form the datetime field belongs to.</p>

<button onclick="myFunction()">Try it</button>

<p><strong>Note:</strong> input elements with type="datetime" are not supported in any of the major browsers, except partially in Safari.</p>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("myDatetime").form.id;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>