DAX calculated column code to add business days or network days to a date.
VAR __Date = IF(Table1[StartDate] <> BLANK(), Table1[StartDate], date(2000, 1, 1))
// Days to Add; in my use case, the # of days was dependent on a category value. You can just set this a specific number if applicable
VAR __Days = SWITCH(TRUE(),
[Category] = “Complex”, 43,
[Category] = “Moderate”, 31,
[Category] = “Simple”, 29,
// This var creates a temp calendar padded out by the *3
VAR __Calendar = ADDCOLUMNS(CALENDAR(__Date, __Date + (__Days) * 3), “Weekday” , WEEKDAY([Date],2))
// filter out the weekends
VAR __CalendarX = FILTER(__Calendar, [Weekday] < 6)
// add an addition column to the temp calendar that counts the # of days needed.
VAR __CalendarY = ADDCOLUMNS(__CalendarX, “Days”, COUNTROWS(FILTER(__CalendarX, [Date] <= EARLIER([Date]))
// returns the new ‘due’ date that is __Days out from the StartDate.
SELECTCOLUMNS(FILTER(__CalendarY, [Days] = __Days), “Date”, [Date])