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<!DOCTYPE html> <html> <body> <input type="datetime-local" id="myLocalDate"><br><br> <button onclick="disableBtn()">Disable Local Datetime Field</button> <button onclick="undisableBtn()">Undisable Local Datetime Field</button> <p><strong>Note:</strong> input elements with type="datetime-local" do not show as any datetime field/calendar in Firefox.</p> <script> function disableBtn() { document.getElementById("myLocalDate").disabled = true; } function undisableBtn() { document.getElementById("myLocalDate").disabled = false; } </script> </body> </html>