<!DOCTYPE html>
<html>
<body>
Week and Year:
<input type="week" id="myWeek" min="2014-W12" max="2014-W19">
<p>Click the button to change the value of the max attribute of the week field.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> input elements with type="week" are not supported in Internet Explorer or Firefox.</p>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myWeek").max = "2014-W35";
document.getElementById("demo").innerHTML = "The value of the max attribute was changed from '2014-W19' to '2014-W35'.";
}
</script>
</body>
</html>