javascript - jQuery UI Datepicker difference in days

Question

I need to calculate the number of weeks difference between the chosen date and the current date. I've tried to calculate with weekNumberPicked - weekNumberCurrent, but if the two dates are in different years, the result is incorrect, so I probably need to get it like daysDifference / 7. How should I implement this with the onSelect action?

Answer 1

You can use the Datepicker's function getDate to get a Date object.

Then just subtract one date from the other (might want to get the absolute value as well) to get the milliseconds in difference, and calculate the difference in days, or weeks.

$('#test').datepicker({
    onSelect: function() {
        var date = $(this).datepicker('getDate');
        var today = new Date();
        var dayDiff = Math.ceil((today - date) / (1000 * 60 * 60 * 24));
    }
});