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<!DOCTYPE html>
<html>
<body>
Birthday: <input type="datetime" id="myDatetime" name="bdaytime">
<p>Click the buttons to display and/or change the value of the name attribute of the datetime field.</p>
<button onclick="display()">Display name</button>
<button onclick="change()">Change name</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>
<script>
function display() {
  var x = document.getElementById("myDatetime").name;
  alert("The name of the datetime field is: " + x);
}
function change() {
  var x = document.getElementById("myDatetime").name = "newDatetimeName";
  alert ("The name was changed to: " + x);
}
</script>
</body>
</html>