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<!DOCTYPE html> <html> <body> Week: <input type="week" id="myWeek"> <p>Click the button to change the value of the step attribute of the week field.</p> <p><b>Tip:</b> Open the calendar on the right side of the week field before and after you click the button, to see the effect.</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() { document.getElementById("myWeek").step = "2"; document.getElementById("demo").innerHTML = "Step was set to '2', meaning that the user can only select every second week in the calendar."; } </script> </body> </html>