calculate date without holidays (only working days)

jcamilo1985 I am afraid I can't comment on this. Probably because my function uses recursive call. I don't know. It's quite easy to reproduce this function using List.Generate. I'll try to do that a bit later, mate.  

Thank you very much for your commitment and interest in this topic AlienSx .
After several attempts, I was finally able to find the solution, but all thanks to the base that you gave me.

Here I share it in case someone else needs it at some point.
In the same way thanks to the other people who read the thread and were interested.

(start as date, days as number, holidays as list) as date =>
  let
    dates = List.Generate(
      () => [
        date = start,
        count = 1,
        holiday = List.Contains(holidays, start)
          or List.Contains({5, 6}, Date.DayOfWeek(start, Day.Monday))
      ],
      each [count] <= days,
      each [
        date = Date.AddDays([date], 1),
        count = [count] + (if [holiday] then 0 else 1),
        holiday = List.Contains(holidays, Date.AddDays([date], 1))
          or List.Contains({5, 6}, Date.DayOfWeek(Date.AddDays([date], 1), Day.Monday))
      ],
      each [date]
    ),
    result = List.LastN(dates, 1){0}
  in
    result