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WORKDAY.INTL function: Description, Usage, Syntax, Examples and Explanation

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What is WORKDAY.INTL function in Excel?

WORKDAY.INTL function is one of Date and Time functions in Microsoft Excel that 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.

Syntax of WORKDAY.INTL function

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

The WORKDAY.INTL function syntax has the following arguments:

  • Start_date: The start date, truncated to integer.
  • Days: 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 and are not considered working days. Weekend is a weekend number or string that specifies when weekends occur.Weekend number values indicate the following weekend days:
Worked Example:   How to calculate project start date based on end date in Excel
weekend-number Weekend days
1 or omitted Saturday, Sunday
2 Sunday, Monday
3 Monday, Tuesday
4 Tuesday, Wednesday
5 Wednesday, Thursday
6 Thursday, Friday
7 Friday, Saturday
11 Sunday only
12 Monday only
13 Tuesday only
14 Wednesday only
15 Thursday only
16 Friday only
17 Saturday only

Weekend string values are seven characters long and each character in the string represents a day of the week, starting with Monday. 1 represents a non-workday and 0 represents a workday. Only the characters 1and 0 are permitted in the string. 1111111 is an invalid string.

For example, 0000011 would result in a weekend that is Saturday and Sunday.

  • 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.
Worked Example:   Get project midpoint in Excel

WORKDAY.INTL formula explanation

  • 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.

Example of WORKDAY.INTL function

  • Add workdays to date custom weekends in Excel
  • Add workdays no weekends in Excel
  • Calculate series of dates by workdays in Excel
  • Get project midpoint in Excel
Worked Example:   Add workdays no weekends in Excel

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

Formula Description Live Result
=WORKDAY.INTL(DATE(2012,1,1),30,0) Using a 0 for the Weekend argument results in a #NUM! error. #NUM!
=WORKDAY.INTL(DATE(2012,1,1),90,11) Finds the date 90 workdays from 1/1/2012, counting only Sundays as a weekend day (Weekend argument is 11). 41013
=TEXT(WORKDAY.INTL(DATE(2012,1,1),30,17),”m/dd/yyyy”) Uses the TEXT function to format the resulting serial number (40944) in a “m/dd/yyyy” format. Finds the date 30 workdays from 1/1/2012, counting only Saturdays as a weekend day (Weekend argument is 17). 2/05/2012

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