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<!DOCTYPE html> <html> <body> Time: <input type="time" id="myTime" min="20:00" max="22:00"> <p>Click the button to change the value of the max attribute of the time field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myTime").max = "23:00"; document.getElementById("demo").innerHTML = "The value of the max attribute was changed from '22:00' to '23:00'."; } </script> </body> </html>