I have a Start date field and a Number of days field, I would like to get the End date by using the fields mentionated before. Also, I would like it to not count the weekends, e.g:

Start date field: 15-september-2017

Number of days field: 4

End date field: 20-september-2017

...and so on.

I managed to do it in the other way around though, can anyone help me out with this please? I would really appreciate it.

Best regards.