The WORKDAY.INTL function is a powerful utility in Excel designed to compute a future date that excludes weekends and specified holidays. It is particularly useful for project management, scheduling, and any scenario where it’s necessary to account for non-working days beyond the traditional Saturday and Sunday.

Syntax

The syntax of the WORKDAY.INTL function is as follows:

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

Where:
– start_date: The initial date from which the calculation begins.
– days: The number of working days to add. This can be a positive or negative number.
– weekend (optional): A string of seven characters (0 or 1) that specifies which days are considered weekends (1 – non-working day, 0 – working day). For example, “0000011” treats Saturday and Sunday as weekends.
– holidays (optional): A range or array of dates to be excluded from the working days count.

Examples

Here are three practical examples to demonstrate the usage of the WORKDAY.INTL function:

Example 1: Basic Usage
Calculate a date 10 working days after March 1, 2023, considering Saturday and Sunday as weekends.

=WORKDAY.INTL("2023-03-01", 10)

The result will be March 15, 2023.

Example 2: Custom Weekend
Calculate a date 5 working days after March 1, 2023, considering Friday and Saturday as weekends.

=WORKDAY.INTL("2023-03-01", 5, "0000011")

The result will be March 9, 2023.

Example 3: Including Holidays
Calculate a date 15 working days after March 1, 2023, excluding holidays on March 8 and March 12.

=WORKDAY.INTL("2023-03-01", 15, 1, {"2023-03-08", "2023-03-12"})

The result will be March 23, 2023.

Error Handling

When using the WORKDAY.INTL function, several errors may arise:
– VALUE!: This error occurs if the start_date is not a valid date, or if the days parameter is not a numeric value.
– NUM!: This error indicates that the resulting date is not a valid date due to the specified parameters, such as including too many holidays.

To manage these errors, ensure that the date and numeric inputs are correctly formatted, and adjust the days or holidays as necessary.

Conclusion

The WORKDAY.INTL function enhances the ability to accurately calculate working days across various contexts, accommodating custom weekend days and holidays. Understanding how to utilize this function effectively can streamline scheduling and project management tasks in Excel, making it a vital tool for many users.