<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 min attribute of the week field.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myWeek").min = "2014-W16";
document.getElementById("demo").innerHTML = "The value of the min attribute was changed from '2014-W12' to '2014-W16'.";
}
</script>
</body>
</html>