The result is a date number that can be formatted as a date. You then see the date of a day that is a certain number of workdays away from the start date.
WORKDAY(StartDate; Days [; Holidays])
What date comes 17 workdays after 1 December 2001? Enter the start date "12/1/2001" in C3 and the number of workdays in D3. Cells F3 to J3 contain the following Christmas and New Year holidays: "12/24/2001", "12/25/2001", "12/26/2001", "12/31/2001", "1/1/2002".
=WORKDAY(C3;D3;F3:J3) returns 2001-12-28. Format the serial date number as a date, for example in the format YYYY-MM-DD.