Excel NETWORKDAYS.INTL Function

NETWORKDAYS.INTL calculates work days between two dates. Work days exclude weekends (Saturday and Sunday by default) and can optionally exclude holidays. This function is more robust that the NETWORKDAYS function, because it allows you to control which days of the week are considered weekends. The weekend argument is set using the codes listed in the table below.

NETWORKDAYS.INTL includes both the start date and end date when calculating work days. This means if you give NETWORKDAYS.INTL the same date for start date and end date, and the date is not a weekend or holiday, it will return 1.

NETWORKDAYS.INTL can also optionally take into account holidays. For the holidays argument, supply a range that contains holiday dates. These are also treated as non-working days and will not be included in the result.

In the example shown, the following formulas are used:

D6=NETWORKDAYS.INTL(B6,C6)
D7=NETWORKDAYS.INTL(B7,C7,17)
D8=NETWORKDAYS.INTL(B8,C8,1,B13:B14)
D9=NETWORKDAYS.INTL(B9,C9,"0000000")
D10=NETWORKDAYS.INTL(B10,C10,"0000000",B13:B14)

Mask for workdays

The NETWORKDAYS.INTL function can also accept a "mask" to specify weekends for the weekend argument. The mask is provided as a string of 7 characters which must be either 1 or zero. In this scheme, the number 1 means weekend and 0 means workday. The first digit represents Monday. Below are some examples:

NETWORKDAYS.INTL(start,end,"0101011") // workdays = M,W,F
NETWORKDAYS.INTL(start,end,"1010111") // workdays = Tue, Thu
NETWORKDAYS.INTL(start,end,"1111100") // workdays = Fri,Sat
NETWORKDAYS.INTL(start,end,"0000000") // all workdays, no weekends

Notes:

• If start_date is greater than end_date, the the function returns a negative value.

• NETWORKDAYS.INTL includes both the start date and end date when calculating work days. This means if you give NETWORKDAYS.INTL the same date for start date and end date, it will return 1.

• If start_date or end_date are out of range, NETWORKDAYS.INTL returns the #NUM! error.
• If weekend is invalid, NETWORKDAYS.INTL returns the #VALUE! error.