How do I find the days between two dates in JavaScript or jQuery datepicker?

Question

I am using jQuery datepicker. In my application, I have startDate and endDate date ranges.

If my date range is less than a week(7 days), I need to disable some day textbox's. Please see the image below

Expected output:

I can able to get the number of days difference between to dates like this;

var startDate = $('#startDate').datepicker('getDate');
var endDate = $('#endDate').datepicker('getDate');
//find difference between start and end date
var noOfDays = Math.ceil((startDate - startDate) / (1000 * 60 * 60 * 24));

If noOfDays is less than 7 days, I need to disable the day textbox according to the date range. For that I need list days between date ranges.

According to my example image Mon and Sun should be disabled.

['Tue','Wed','Thu','Fri','Sat'] or corresponding UTC day values ['1','2','3','4','5'] should be enabled.

Can anyone guide me to get day values?

Answer 1

Try this : month is start from 0.

var from = new Date(2016, 11, 29);
var to = new Date(2016, 11, 31);
var DAYS = ['Sun', 'Mon', 'Tu', 'Wed', 'Th', 'Fri', 'Sat'];

var d = from;
while (d <= to) {
    alert(DAYS[d.getDay()]);
    d = new Date(d.getTime() + (24 * 60 * 60 * 1000));
}