[libreoffice-users] Start Date

Hello, 

I have a table like:

11.04.2022;service a;250
12.04.2022;service a;250
13.04.2022;service a;250
14.04.2022;service b;250
15.04.2022;service b;250
12.05.2022;service b;250
13.05.2022;service c;250
14.05.2022;service c;250
17.05.2022;service d;250
18.05.2022;service d;250

Service a need 10 meters par day.
Service b need 1 meters par day.
Service c need 3 meters par day.
Service d need 5 meters par day.

This mean 11.04.2022 - 25 working days = Project Start Day.

The date is enddate, I need the start day based on service values of meters
and only working days.

Is there a way?

Thank you 
Silvio

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