JavaScript Week Picker

One of the new input types in HTML5 is week which allows you to specify a week period. Unfortunately although Chrome brings up a nice datepicker to allow you to select the week Firefox and IE12 and earlier don’t implement this and so just display a standard input text box.

In order to create an equivalent of the Chrome week picker I used bootstrap-datepicker and updated the CSS and events for it to allow it to select weeks.

The below code was part of a .NET Core MVC project, hence the embedded C#.

References are needed to the relevant CSS and js files for JavaScript, Bootstrap and bootstrap-datepicker.


    DateTimeFormatInfo dateTimeFormatInfo = DateTimeFormatInfo.CurrentInfo;
    Calendar calendar = dateTimeFormatInfo.Calendar;
    string week = TempData["Week"].ToString();

<div class="row">
    <div class="col-lg-2">
        <input type="week" value="@week" class="form-control" id="Week" />


/* Week picker */
.datepicker-days > table > tbody > tr:hover {
    background-color: #808080;


$(document).ready(function () {
	// Add weekpicker
	if (navigator.userAgent.indexOf("Firefox") != -1 || navigator.userAgent.indexOf("Trident") != -1) {
			calendarWeeks: true,
			weekStart: 1

$('#Week').on('changeDate', function (e) {
	var value = $("#Week").val();
	var year = moment().format('YYYY');
	var week = moment('WW');
	$("#Week").val(year + '-W' + week);


Simon Gutgesell · 10th May 2018 at 4:13 pm

I am a student at a Swedish highschool, and I am developing an alternative schedule viewer since the school’s viewer is not really that practical. I earlier used Chrome’s default datepicker but since many other students use Safari (we got MacBooks from our highschool) I would like to use a more controversial datepicker. The thing is that the schedule generator can generate both week schedules and day schedules, and I made it so that the website uses the type of schedule that suits the window ratio of the webpage the best. Which leads me to my problem, I used the bootstrap-datepicker –which your cover fortunately is based on– for the day schedule. The only problem with it is that the documentation is somewhat poor. I would love to get a little bit more information about how it works. Please contact me if you have some spare time and care to explain.

    Shinigami · 11th May 2018 at 10:10 am

    Hi Simon, sorry, I’m not an expert in bootstrap-datepicker and am currently on holiday so don’t have access to my development machine. If the reader doesn’t contain enough details you could check out the projects GitHub page which should be able to provide you with more details and where you can raise an issue if you need help with anything specific. Good luck with the project.

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