The WORKDAY function in Microsoft Excel is a built-in function that allows you to calculate the date that is a certain number of working days before or after a given start date. It takes two arguments: the start date and the number of working days to add or subtract from the start date. The function returns the resulting date as a serial number that can be formatted as a date.

To use the WORKDAY function in Excel, follow these steps:

- Open a new or existing worksheet in Excel.
- Select the cell where you want to display the result of the WORKDAY function.
- Type the following formula in the cell: =WORKDAY(start_date, days, [holidays])
- Replace “start_date” with the cell reference or the start date, “days” with the number of working days to add or subtract from the start date, and “[holidays]” with the optional list of holidays that should be excluded from the calculation.

The “[holidays]” argument is optional, and can be a range of cells that contain the dates of the holidays that should be excluded from the calculation, or an array of holiday dates. If you omit the “[holidays]” argument, the function will assume that there are no holidays and include all days in the calculation.

- Press Enter to calculate the result of the WORKDAY function.

For example, let’s say you have a list of start dates in column A, and you want to calculate the date that is 5 working days after each start date and display the result in column B. You can use the WORKDAY function as follows:

- In cell B1, type the formula =WORKDAY(A1, 5)
- Press Enter to calculate the result.
- Select cell B1, and then drag the fill handle (the small square in the bottom-right corner of the cell) down to fill the formula in the remaining cells of column B.

This will calculate the date that is 5 working days after each start date in column A and display the result in column B.

Note: The WORKDAY function returns the resulting date as a serial number, which can be formatted as a date using the DATEVALUE function or the Format Cells dialog. For example, you can use the formula =DATEVALUE(WORKDAY(A1, 5)) to convert the serial number to a date, or you can select the cell and use the Format Cells dialog to format the cell as a date.

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