NETWORKDAYS

NETWORKDAYS(start_date, end_date [,holidays])

Returns the number of working days between two dates excluding weekends and holidays.

start_date	The starting date.
end_date	The finishing date.
holidays	(Optional) The dates to exclude from the working calendar, holidays and floating days.

REMARKS

* NETWORKDAYS.INTL was added in Excel 2010 to replace this function and to let you choose what days you want to treat as weekends.
* This function should be pronounced NET workdays.
* This function can be used to calculate the total days (given a start date and end date).
* This function has an explicit assumption that weekends are Saturday and Sunday.
* This function will always exclude weekends but can also exclude any other dates specified in the "holidays" array.
* Both the "start_date" and the "end_date" are included in the total count.
* If "start_date" is not a valid date, then #VALUE! is returned.
* If "end_date" is not a valid date, then #VALUE! is returned.
* If "holidays" is left blank, then only weekends will be excluded.
* The "holidays" allows you to specify bank holidays as well as any other floating holidays.
* The "holidays" can either be a range of cells containing dates or an array constant of serial numbers.
* If "holidays" contains anything that is not a valid date, then #VALUE! is returned.
* You can use the DATE function to return the date as a date serial number given a year, month, day.
* You can use the DATEVALUE function to return the date serial number for a date in text format.
* You can use the DAYS function to return the number of days between two dates.
* You can use the DAYS360 function to return the number of days between two dates, based on 30 day months.
* You can use the NETWORKDAYS.INTL to return the number of working days between two dates excluding weekends and holidays.
* You can use the WORKDAY function to return the date serial number that is a given number of working days before or after a date.
* You can use the WORKDAY.INTL to return the date serial number that is a given number of working days before or after a date.
* You can use the NETWORKDAYSMISC - User Defined Function to return the number of days between two dates using a defined list of workdays.
* For the Microsoft documentation refer to support.microsoft.com

	A	B
1	=NETWORKDAYS("1 Jan 2021", "1 Jan 2021") = 1	Fri, 1 Jan 2021
2	=NETWORKDAYS("1 Jan 2022", "2 Jan 2022") = 0
3	=NETWORKDAYS("1 Jan 2022", "3 Jan 2022") = 1	Sat, 1 Jan 2022
4	=NETWORKDAYS("1 Jan 2022", "9 Jan 2022") = 5	Sun, 2 Jan
5	=NETWORKDAYS("1 Jan 2022", "4 Jan 2022", "3 Jan 2022") = 1	Mon, 3 Jan
6	=NETWORKDAYS("1 Jan 2022", "4 Jan 2022", {"3 Jan 2022", "4 Jan 2022"}) = 0	Tue, 4 Jan
7	=NETWORKDAYS("1 Jan 2022", "1 Feb 2022") = 22	Wed, 5 Jan
8	=NETWORKDAYS("30 Jan 2022", "02 Feb 2022") = 3	Thu, 6 Jan
9	=NETWORKDAYS("31 Jan 2022", "02 Feb 2022") = 3	Fri, 7 Jan
10	=NETWORKDAYS( DATE(2022, 1, 1), DATE(2022, 1, 9)) = 5	Sat, 8 Jan
11	=NETWORKDAYS("14 Jan 2022", "1 Jan 2022") = -10	Sun, 9 Jan
12	=NETWORKDAYS("1 Jan 2022", "9 Jan 2022", {"3 Jan 2022", "4 Jan 2022"}) = 3
13	=NETWORKDAYS(1/1/2022, 31/12/2022) = 0
14	=NETWORKDAYS("1/30/2024", "invalid dates") = #VALUE!
15	=NETWORKDAYS("1 Jan 2024", "9 Jan 2024", {"some text"}) = #VALUE!

1 - Does "1 Jan 2021" fall on a workday or a weekend. This is a Friday. When the start date and end date are the same, this function returns 1 when it's a workday.
2 - How many working days between 1 Jan 2022 and 2 Jan 2022. These days were Saturday and Sunday, so zero.
3 - How many working days between 1 Jan 2022 and 3 Jan 2022. These days were Saturday, Sunday and Monday, so one.
4 - How many working days between 1 Jan 2022 and 9 Jan 2022. Two of these days are Saturday and two are Sunday, so 9 - 4 = 5
5 - How many working days between 1 Jan 2022 and 4 Jan 2022. The 1 Jan is Saturday and 2 Jan is Sunday and since the 3 Jan is a holiday the only workday is 4 Jan.
6 - How many working days between 1 Jan 2022 and 4 Jan 2022. The 1 Jan is Saturday and 2 Jan is Sunday and since both 3 Jan and 4 Jan are holidays there are no working days.
7 - How many working days between 1 Jan 2022 and 1 Feb 2022.
8 - How many working days between 30 Jan 2022 and 2 Feb 2022. There are 31 days in January but 30 Jan 2022 is Sunday.
9 - How many working days between 31 Jan 2022 and 2 Feb 2022.
10 - This is the same as Example 4 using the DATE function.
11 - How many working days between 14 Jan 2022 and 1 Jan 2022. The start date is before the end date.
12 - How many working days between 1 Jan 2022 and 9 Jan 2022. Two additional holidays have been provided which fall on a Monday and a Tuesday, so 5 - 2 = 3
13 - How many working days between 1/1/2022 and 31/12/2022. These are not recognised dates and are just very small values.
14 - If the start_date or end_date are not valid dates, then #VALUE! is returned.
15 - If the holidays does not contain valid dates, then #VALUE! is returned.