Dif between two dates without weekend & public holidays

Hello,

follwing problem.

I want to create a DAX formula which shows the difference from a specific date to today.

Tage_seit_erster_Objektbegung = if(KontElemente[Datum der Besichtigung]<>BLANK();

                                                           TODAY()-KontElemente[Datum der Besichtigung].[Date];

                                                             BLANK())

Is it possible to count only the working days (monday-Friday) except public holidays

Thanks in advance