How it works
Arithmetic uses calendar dates, without timezones or daylight-saving offsets. Between mode includes only endpoints whose boxes are checked; if both dates are the same, both boxes must be checked to count that date. Add mode excludes the start date, then advances until the requested number of working dates has been counted. Holiday observations are entirely your responsibility.
The formulaBusiness days = included calendar dates excluding selected weekends and entered holidays
Add mode starts counting after the start date; adding zero returns the start date
Add mode starts counting after the start date; adding zero returns the start date