How it's calculated
result date = start date + n days
start date = chosen date, n = days added (default 30; subtracted when counting backward). Business mode counts only weekdays, skipping Sat/Sun.
Common questions
Does it skip weekends?
Only in business-day mode. There it counts Monday through Friday and skips Saturdays and Sundays.
Can it count backward?
Yes. Choose a date before the start date or enter a negative count to find a date in the past.