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<html><body>Date and time:<input type="datetime" id="myDatetime" min="2000-01-01T22:57Z" max="2014-02-06T22:57Z"><p>Click the button to change the value of the max attribute of the datetime field.</p><button onclick="myFunction()">Try it</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><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myDatetime").max = "2012-01-01T11:57Z"; document.getElementById("demo").innerHTML = "The value of the max attribute was changed from '2014-02-06T22:57Z' to '2012-01-01T11:57Z'.";}</script></body></html>