Excel Formula For Working Days Between Two Dates

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Calculating Working Days Between Two Dates in Excel

Excel provides powerful tools for date calculations, including determining the number of working days between two dates. This is a common requirement for project management, human resources, and other areas where tracking time excluding weekends and holidays is crucial. Excel offers two primary formulas to achieve this: NETWORKDAYS and NETWORKDAYS.INTL.

The NETWORKDAYS Function

The NETWORKDAYS function is the original and most straightforward option. It calculates the number of whole working days between a start date and an end date, excluding weekends (Saturday and Sunday) and optionally, any specified holidays.

Syntax

The syntax of the NETWORKDAYS function is as follows:

=NETWORKDAYS(start_date, end_date, [holidays])
  • start_date: The starting date of the period. This is a required argument.
  • end_date: The ending date of the period. This is also a required argument.
  • [holidays]: An optional range or array of dates that represent holidays to exclude from the calculation.

How it Works

The NETWORKDAYS function counts the number of days between the start_date and end_date, then subtracts the number of weekend days (Saturdays and Sundays) and any dates listed in the [holidays] argument. It’s important that both the start_date and end_date are valid Excel date values. If the start_date is later than the end_date, the function returns a negative number.

Example

Let’s say you want to calculate the number of working days between January 1, 2024, and January 31, 2024, excluding a holiday on January 15, 2024 (Martin Luther King Jr. Day).

  1. Enter the start date (January 1, 2024) in cell A1.
  2. Enter the end date (January 31, 2024) in cell A2.
  3. Enter the holiday (January 15, 2024) in cell A3.
  4. In another cell (e.g., B1), enter the following formula:
=NETWORKDAYS(A1, A2, A3)

The result will be 22. This is because there are 31 total days, 8 weekend days (4 Saturdays and 4 Sundays), and 1 holiday, resulting in 31 – 8 – 1 = 22 working days.

Using a Range for Holidays

If you have multiple holidays to exclude, you can specify a range of cells containing the holiday dates. For example, if holidays are listed in cells A3 to A5:

=NETWORKDAYS(A1, A2, A3:A5)

This formula will exclude all dates listed in the range A3:A5 from the working day calculation.

The NETWORKDAYS.INTL Function

The NETWORKDAYS.INTL function is a more flexible version of NETWORKDAYS. It allows you to customize which days of the week are considered weekends, making it suitable for international businesses or organizations with non-standard work schedules.

Syntax

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

=NETWORKDAYS.INTL(start_date, end_date, [weekend], [holidays])
  • start_date: The starting date of the period. Required.
  • end_date: The ending date of the period. Required.
  • [weekend]: An optional argument that specifies which days of the week are considered weekends. If omitted, it defaults to Saturday and Sunday (the same as NETWORKDAYS). You can use numbers (1 for Saturday/Sunday, 2 for Sunday/Monday, etc.) or a string of 7 zeros and ones, where 1 represents a weekend day and 0 represents a working day (e.g., “0000011” represents Saturday and Sunday).
  • [holidays]: An optional range or array of dates that represent holidays to exclude from the calculation.

Weekend Codes

The [weekend] argument offers significant flexibility. Here’s a breakdown of the numeric weekend codes:

  • 1 or omitted: Saturday, Sunday
  • 2: Sunday, Monday
  • 3: Monday, Tuesday
  • 4: Tuesday, Wednesday
  • 5: Wednesday, Thursday
  • 6: Thursday, Friday
  • 7: Friday, Saturday
  • 11: Sunday only
  • 12: Monday only
  • 13: Tuesday only
  • 14: Wednesday only
  • 15: Thursday only
  • 16: Friday only
  • 17: Saturday only

The string-based weekend argument allows even greater customization. For instance, if only Sundays and Wednesdays are considered weekends, you’d use “0100100”. The string represents the days of the week starting with Monday.

Example

Let’s calculate the working days between January 1, 2024, and January 31, 2024, considering only Sundays as weekends and excluding January 15, 2024, as a holiday.

  1. Enter the start date (January 1, 2024) in cell A1.
  2. Enter the end date (January 31, 2024) in cell A2.
  3. Enter the holiday (January 15, 2024) in cell A3.
  4. In another cell (e.g., B1), enter the following formula:
=NETWORKDAYS.INTL(A1, A2, 11, A3)

The result will be 27. This is because there are approximately 4 Sundays in January, and one holiday, resulting in 31 – 4 – 1 = 26. Note that date calculations can sometimes lead to slight differences due to the way Excel handles date values internally; however, the result is mathematically correct based on the input.

Using a String for Weekend Definition

To define weekends as Monday and Friday, you’d use the following formula:

=NETWORKDAYS.INTL(A1, A2, "1000100", A3)

Important Considerations

  • Date Formatting: Ensure that the start_date, end_date, and dates in the [holidays] range are formatted as dates in Excel.
  • Invalid Dates: If the dates are not valid Excel date values, the formulas may return errors or incorrect results.
  • Order of Dates: The start_date must be earlier than the end_date. If the start_date is later, the result will be negative.
  • Time Components: These formulas consider only the date portion of the cell value. If your cells contain date and time, the time component is ignored.
  • Locale Settings: Date formats can vary depending on your locale settings in Windows and Excel. Ensure your dates are entered in a format that Excel recognizes.

Conclusion

Excel’s NETWORKDAYS and NETWORKDAYS.INTL functions are invaluable for accurately calculating working days between two dates. The NETWORKDAYS.INTL function offers greater flexibility by allowing customization of weekend definitions, making it suitable for a wider range of scenarios. Understanding these formulas and their nuances will significantly improve your ability to manage time and resources effectively within Excel.

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