NETWORKDAYS

NETWORKDAYS(start_date, end_date [,holidays])

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

start_dateThe starting date.
end_dateThe finishing date.
holidays(Optional) An array of dates to exclude.

REMARKS
* NETWORKDAYS.INTL was added in Excel 2010 to replace this function.
* The NETWORKDAYS.INTL function allows you to specify what days you want to treat as weekends.
* This function has an explicit assumption that weekends are Saturday and Sunday.
* This function excludes weekends and 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 range of cells containing dates or an array constant of serial numbers.
* If "holidays" contains anything that is not a valid date, then #NUM! 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 given a date in text format.
* 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
* For the Google documentation refer to support.google.com

 AB
1=NETWORKDAYS("1 Jan 2021","1 Jan 2021") = 1Saturday, January 01, 2022
2=NETWORKDAYS("1 Jan 2022","1 Jan 2022") = 0Sunday, January 02, 2022
3=NETWORKDAYS("1 Jan 2023","2 Jan 2023") = 1Monday, January 03, 2022
4=NETWORKDAYS("1/1/2023","9/1/2023") = 6Tuesday, January 04, 2022
5=NETWORKDAYS(B1,B9) = 5Wednesday, January 05, 2022
6=NETWORKDAYS("1 Jan 2022","30 Jan 2022") = 20Thursday, January 06, 2022
7=NETWORKDAYS("1 Jan 2022","31 Jan 2022") = 21Friday, January 07, 2022
8=NETWORKDAYS("1 Jan 2022","1 Feb 2022") = 22Saturday, January 08, 2022
9=NETWORKDAYS("30 Jan 2022","02 Feb 2022") = 3Sunday, January 09, 2022
10=NETWORKDAYS("31 Jan 2022","02 Feb 2022") = 3 
11=NETWORKDAYS("1 Jan 2022","31 Dec 2022") = 260 
12=NETWORKDAYS("14 Jan 2022","1 Jan 2022") = -10 
13=NETWORKDAYS(1/1/2022,31/12/2022) = 0 
14=NETWORKDAYS(DATE(2022,1,1),DATE(2022,12,31)) = 260 
15=NETWORKDAYS(DATE(2022,1,1),DATE(2022,12,31),"2 Jan 2022") = 260 
16=NETWORKDAYS(DATE(2022,1,1),DATE(2022,12,31),{"2 Jan 2022","3 Jan 2022"}) = 259 
17=NETWORKDAYS("1/30/2023","invalid dates") = #VALUE! 
18=NETWORKDAYS("some text","2023/12/01") = #VALUE! 

1 - How many working days are there between 1 Jan 2021 and 1 Jan 2021. This day was a Friday.
2 - How many working days are there between 1 Jan 2022 and 1 Jan 2022. This day was a Saturday.

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