Javascript: Get Range of Dates in Array

Javascript

Date.prototype.addDays = function(days) {
    var dat = new Date(this.valueOf());
    dat.setDate(dat.getDate() + days);
    return dat;
};

function getDates(startDate, stopDate) {
    var dateArray = [];
    var currentDate = startDate;
    while (currentDate <= stopDate) {
        dateArray.push(self.formatDate(currentDate));
        currentDate = currentDate.addDays(1);
    }
    return dateArray;
}