<!DOCTYPE html>
<html>
<body>
Birthday: <input type="date" id="myDate" name="bday">
<p>Click the buttons to display and/or change the value of the name attribute of the date field.</p>
<button onclick="display()">Display name</button>
<button onclick="change()">Change name</button>
<p><strong>Note:</strong> input elements with type="date" do not show as any date field/calendar in Firefox.</p>
<script>
function display() {
var x = document.getElementById("myDate").name;
alert("The name of the date field is: " + x);
}
function change() {
var x = document.getElementById("myDate").name = "newDateName";
alert ("The name was changed to: " + x);
}
</script>
</body>
</html>