calculate date without holidays (only working days)

First of all thank you very much for coming so quickly to my aid AlienSx . really thank you

I was evaluating the code and I still have a problem, it basically boils down to the fact that it is adding a day to the departure date, therefore the result is not as expected, since I must count the days from the moment the departure date begins.

Prepare the following image where it will be clearer, for the month of March. I asked that 5 working days be calculated (yellow boxes), that is, starting on March 31, the function should return March 10, in this case it returns March 11.

In the case of June, I asked to return 15 business days, that is, my expected response would be July 14, but it returns July 17.

I tried to modify the code that you provided me but I was not able to obtain the solution, I leave it here modified and I hope that you can please guide me on how to solve this issue. Thank you very much in advance

    // start = your date
    // days = number of business days to add
    // holidays = list with holidays (list of dates), can be empty list {}
    (start as date, days as number, holidays as list) as date => 
        let 
            next = Date.AddDays(start, 1),
            holi = List.Contains(holidays, next) or List.Contains({5, 6}, Date.DayOfWeek(next,Day.Monday)),
            result = if days = 0 then start 
                        else @add_business_days(next, days - (if holi then 0 else 1), holidays)
        in 
            result