The WORKDAY.INTL function returns the serial number of the date before or after a specified number of workdays with custom weekend parameters. Weekend parameters indicate which and how many days are weekend days. Weekend days and any days that are specified as holidays are not considered as workdays.

WORKDAY.INTL takes 2 required arguments and 2 optional arguments:

Syntax: WORKDAY.INTL(start_date, days, [weekend], [holidays])

#1)
Using the WORKDAY.INTL function:
#2)
The arguments for the WORKDAY.INTL function are:
Argument Required? Description
start_date Required The start date, truncated to integer.
days Required The number of workdays before or after the start_date. A positive value yields a future date; a negative value yields a past date; a zero value yields the start_date. Day-offset is truncated to an integer.
weekend Optional Indicates the days of the week that are weekend days. Weekend is a weekend number or string that specifies when weekends occur. Weekend number values indicate the following weekend days:
Possibleweekendargument values:
holidays Optional An optional set of one or more dates that are to be excluded from the working day calendar. Holidays shall be a range of cells that contain the dates, or an array constant of the serial values that represent those dates. The ordering of dates or serial values in holidays can be arbitrary.
#3)
A few more things:
If start_date is out of range for the current date base value, WORKDAY.INTL returns the #NUM! error value.
If any date in holidays is out of range for the current date base value, WORKDAY.INTL returns the #NUM! error value.
If start_date plus day-offset yields an invalid date, WORKDAY.INTL returns the #NUM! error value.
If a weekend string is of invalid length or contains invalid characters, WORKDAY.INTL returns the #VALUE! error value.

Summary

The WORKDAY.INTL function returns the serial number of the date before or after a specified number of workdays with custom weekend parameters.
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