WORKDAY.INTL Function

Basic Description

The Excel Workday.Intl function returns a date that is a supplied number of working days (excluding weekends and holidays) ahead of a given start date. The function allows the user to specify which days are counted as weekends. The function is new in Excel 2010 and so is not available in earlier versions of Excel. However, it is similar to the Workday function, which is available in earlier versions of Excel.

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

where the arguments are as follows:

start_date The initial date, from which to count the number of workdays
days The number of workdays to add onto start_date
[weekend] An optional argument, which specifies which weekdays should be counted as weekends. This can be either a number or a string. These are explained below:

Possible number values for the [weekend] argument are:

[weekend] days counted
as weekend
1
(or omitted)
Sat & Sun
2 Sun & Mon
3 Mon & Tue
4 Tue & Wed
5 Wed & Thu
6 Thu & Fri
7 Fri & Sat
11 Sunday only
12 Monday only
13 Tuesday only
14 Wednesday only
15 Thursday only
16 Friday only
17 Saturday only
Possible string values for the [weekend] argument consist of a series of seven 0’s and 1’s which represent the seven weekdays, starting from Monday.

Each 1 denotes a day that should be counted as a weekend and each 0 represents a working day.

For example,

0000100 denotes Fridays only counted as weekend days
0001100 denotes Thursdays and Fridays counted as weekend days
0000111 denotes Fridays, Saturdays and Sundays counted as weekend days

The string “1111111” is not valid.

[holidays] An optional argument, which specifies an array of dates (in addition to weekends) that are not to be counted as working days

 

Note that the start_date and [holidays] arguments should be input as either references to cells containing dates or dates returned from formulas. If you attempt to input these date arguments as text, Excel may misinterpret them, due to different date systems, or date interpretation settings.

Warning: Although you can input date arguments as date serial numbers, this is not recommended as date serial numbering does vary across different computer systems.

 

Workday.Intl Examples

The spreadsheets below show examples of the Excel Workday.Intl function. The format of the function is shown in the spreadsheet at the top and the results are shown below.

 Formulas:

Examples of use of the Excel Workday.Intl Function

 Results:

Excel Workday.Intl Function Results

In the above spreadsheets :

  • In the example in cell D2 the holidays array has been omitted. Therefore the calculation excludes Saturdays and Sundays but includes all other weekdays, including the holidays at Christmas and New Year.
  • In the example in cell D3 the [weekend] argument is 1 (specifying weekends on Saturdays and Sundays) and the holidays array (in cells B2 – B4) is provided to the Workday.Intl function. Therefore the calculation excludes Saturdays and Sundays and the listed Christmas and New Year holidays.
  • In the example in cell D4 Fridays, Saturdays and Sundays are specified as weekends, but no holiday array has been supplied to the function. Therefore the calculation excludes Fridays, Saturdays and Sundays but includes all other weekdays, including the holidays at Christmas and New Year.

Note also that, as recommended by Microsoft, in all three calls to the Workday.Intl function, the start_date and [holidays] arguments have been supplied as cell references.

 

Workday.Intl Errors

If you get an error from the Excel Workday.Intl function this is likely to be one of the following :

#NUM! – Occurs if either the supplied start_date plus the supplied days argument results in an invalid date or the supplied [weekend] argument is invalid (see above explanation of this argument)
#VALUE! – Occurs if either the supplied start_date or any of the values in the supplied [holidays] array are not valid dates or the supplied days argument is non-numeric

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