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<html><body><form id="myForm"> <input type="datetime-local" id="myLocalDate"></form><p>Click the button to return the id of the form the local datetime field belongs to.</p><button onclick="myFunction()">Try it</button><p><strong>Note:</strong> input elements with type="datetime-local" do not show as any datetime field/calendar in Firefox.</p><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myLocalDate").form.id; document.getElementById("demo").innerHTML = x;}</script></body></html>