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<html><body>Date and time:<input type="datetime-local" id="myLocalDate" min="2000-10-06T22:22:55" max="2014-11-16T21:25:33"><p>Click the button to change the value of the max attribute of the local datetime field.</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").max = "2012-01-01T22:22:55"; document.getElementById("demo").innerHTML = "The value of the max attribute was changed from '2014-11-16T21:25:33' to '2012-01-01T22:22:55'.";}</script></body></html>