The Excel WORKDAY.INTL Function

Related Functions:

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.

The format of the Workday.Intl function is:

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
(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:


- 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.

Examples of use of the Excel Workday.Intl Function
Excel Workday.Intl Function Results

In the above spreadsheets :

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.

Further examples of the Excel Workday.Intl function can be found on the Microsoft Office website.

Workday.Intl Errors

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

Common Errors
#NUM! - Occurs if either:
- the supplied start_date plus the supplied days argument results in an invalid date
- 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
- the supplied days argument is non-numeric