Calendar working days

JeroenP , refer to my blog Traveling Across Workdays - What is next/previous Working day
https://community.powerbi.com/t5/Community-Blog/Travelling-Across-Workdays-Decoding-Date-and-Calendar-4-5-Power/ba-p/1187766

Saturday and Sunday have a date of Friday.

JeroenP 

you can create a column

Working days = 
VAR _count=CALCULATE(COUNTROWS('Table 2'),FILTER('Table 2','Table 2'[weekday]=1&&'Table 2'[Date]<=EARLIER('Table 2'[Date])))
REturn if(_count>1,'Table 2'[Calendar days]-_count+1,'Table 2'[Calendar days])

please see the attachment