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<!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 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>