How to count number of days after excluding weekends using js

I have one query where I need to count number of business days from today to given number,

Like today is 09/14/2021 & given number is 10 I want the last date 09/28/2021 as it is 10th working day from today. I tried below to count day different

    var startDate = new Date();
    var endDate = new Date();
    if(res.defaultLeadTime !== 0){
        endDate.setDate(startDate.getDate() + 10);
    }

I am getting 24th Sep, 2021. Now I am counting weekends between two dates

countWeekendDays = ( d0, d1 ) => {
    var ndays = 1 + Math.round((d1.getTime()-d0.getTime())/(24*3600*1000));
    var nsaturdays = Math.floor( (d0.getDay()+ndays) / 7 );
    return 2*nsaturdays + (d0.getDay()==0) - (d1.getDay()==6);
}

And adding these number of days in the counting gives me another date but I am confuse if there is again weekend in the new date range then what can I do with that days.

So anyone can please guide me for this.

Answer

try this :

var startDate = "14-SEPT-2021";
startDate = new Date(startDate.replace(/-/g, "/"));
var endDate = "", noOfDaysToAdd = 10, count = 0;
while(count < noOfDaysToAdd){
    endDate = new Date(startDate.setDate(startDate.getDate() + 1));
    if(endDate.getDay() != 0 && endDate.getDay() != 6){
       count++;
    }
}
alert(endDate);//You can format this date as per your requirement