Array of dates in javascript

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Javascript

I have 2 dates: start and end
I have created an array of dates using those dates.

Start date = 11/1/2018 Enddate = 4/31/2019

array = [11/1/2018,12/1/2018,1/1/2019,2/1/2019....4/1/2019]

The issue is that it creates the date array properly unless it's the beginning or end of month.

So if my start date is 11/1/2018 and enddate is 04/31/2019, then the array is printing wrong dates otherwise it works fine.

Not sure what i am doing wrong here. Any help is appreciated.

What I have tried:

 function getDateArray (start, end) {
        var arr = [];
        var startDate = new Date(start);
        console.log(startDate);
        var endDate = new Date(end);
        console.log(endDate);

        var ddlPayType = document.getElementById("payType");
        var selectedPayType = ddlPayType.options[ddlPayType.selectedIndex].value;
        var selectedFrequency;
        if (document.getElementById("ddFrequency"))
            selectedFrequency = document.getElementById("ddFrequency").value;

        if (selectedPayType) {
            if (selectedPayType === "A") {
                endDate.setMonth(endDate.getMonth());
            }
            else if (selectedPayType === "B") {
                endDate.setMonth(endDate.getMonth() + 1);
            }
        }
        while (startDate <= endDate) {
         
                        arr.push(new Date(startDate));
                        startDate.setDate(endDate.getDate()+1);
                        startDate.setMonth(startDate.getMonth() +1);
                    }
               
           
            return arr;
}