The WORKDAY function returns a date that is start_date plus or minus days - a specified number of workdays, taking into account weekends and holidays given by list_holidays.
For example, the formula
WORKDAY("February/1/97", 100, "March/28/97")
returns the date "June/23/1997", a date 100 workdays after 1st Feb 97, given a holiday on 28th March.
See also: