The WORKDAY returns a number that represents a date that is the indicated number of working days before or after a date (the starting date). Working days exclude weekends and any dates identified as holidays. Use WORKDAY to exclude weekends or holidays when you calculate invoice due dates, expected delivery times, or the number of days of work performed.

WORKDAY takes 2 required arguments and 1 optional argument:

Syntax: WORKDAY(start_date, days, [holidays])

#1)
Using the WORKDAY function:
#2)
The arguments for the WORKDAY function are:
Argument Required? Description
start_date Required A date that represents the start date.
days Required The number of nonweekend and nonholiday days before or after start_date. A positive value for days yields a future date; a negative value yields a past date.
holidays Optional An optional range of one or more dates to exclude from the working calendar, such as state and federal holidays and floating holidays. The list can be either a range of cells that contains the dates or an array constant of the serial numbers that represent the dates.
#3)
A couple more things:
If any argument is not a valid date, WORKDAY returns the #VALUE! error value.
If start_date plus days yields an invalid date, WORKDAY returns the #NUM! error value.
If days is not an integer, it is truncated.

Summary

The WORKDAY returns a number that represents a date that is the indicated number of working days before or after a date (the starting date).
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