WORKDAY

See Also

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.

If this function is not available, and returns the #NAME? error, install and load the Analysis ToolPak add-in.

Show How?

On the Tools menu, click Add-Ins.
In the Add-Ins available list, select the Analysis ToolPak box, and then click OK.
If necessary, follow the instructions in the setup program.

Syntax

WORKDAY(start_date,days,holidays)

Important Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. Problems can occur if dates are entered as text.

Start_date is a date that represents the start date.

Days is 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 is an optional list 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 contain the dates or an array constant of the serial numbers that represent the dates.

Remarks

Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900. Microsoft Excel for the Macintosh uses a different date system as its default.
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.

Example

The example may be easier to understand if you copy it to a blank worksheet.

Show How?

Create a blank workbook or worksheet.
Select the example in the Help topic. Do not select the row or column headers.

Selecting an example from Help
Press CTRL+C.
In the worksheet, select cell A1, and press CTRL+V.
To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

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A	B
Date	Description
10/01/2008	Start date
151	Days to completion
11/26/2008	Holiday
12/4/2008	Holiday
1/21/2009	Holiday
Formula	Description (Result)
=WORKDAY(A2,A3)	Date 151 workdays from the start date (4/30/2009)
=WORKDAY(A2,A3,A4:A6)	Date 151 workdays from the start date, excluding holidays (5/5/2009)

Notes

To view the number as a date, select the cell and click Cells on the Format menu. Click the Number tab, and then click Date in the Category box.
To convert the range of cells used for holidays in the last example into a array constant, select A4:A6 and then press F9.