WORKDAY.INTL

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

Returns the date serial number that is a given number of working days before or after a date.

start_date	The starting date.
days	The number of workdays before or after the start date.
weekend	(Optional) The number indicating which days to consider weekends: 1 = Saturday and Sunday (default) 2 = Sunday and Monday 3 = Monday and Tuesday 4 = Tuesday and Wednesday 5 = Wednesday and Thursday 6 = Thursday and Friday 7 = Friday and Saturday 11 = Sunday only 12 = Monday only 13 = Tuesday only 14 = Wednesday only 15 = Thursday only 16 = Friday only 17 = Saturday only String Representation (eg 0000011)
holidays	(Optional) A array of dates to exclude from the working calendar, holidays and floating days.

REMARKS

* This function was added in Excel 2010 to replace the WORKDAY function.
* If "start_date" is not an integer, it is truncated.
* If "start_date" is not a valid date, then #VALUE! is returned.
* If "start_date" plus "days" is not a valid date, then #VALUE! is returned.
* If "start_date" is out of range, then #NUM! is returned.
* If "days" is not an integer, it is truncated.
* If "days" > 0, then a future date is returned.
* If "days" < 0, then an earlier date is returned.
* If "days" = 0, then "start_date" is returned.
* The "weekend" can also use a string representation for your weekend. The string must be 7 characters and only contain characters 1 and 0. For example 0000011 represents Saturday and Sunday.
* If "weekend" is left blank, then 1 is used.
* If "weekend" is an invalid string, then #VALUE! is returned.
* The "holidays" can be either a range of cells that contain the dates or an array constant of the serial numbers that represent the dates.
* If "holidays" is left blank, then only weekends will be excluded.
* If "holidays" has more than one date, you can either use an array constant or refer to a cell range.
* If "holidays" contains an invalid 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 given 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 function to return the number of days excluding weekends and holidays.
* You can use the WEEKDAY function to return the day of the week for a given date.
* You can use the WORKDAY6 - User Defined Function function to assume a 6-day working week.
* You can use the WORKDAYSMISC - User Defined Function function to use other days as your workdays.
* For the Microsoft documentation refer to support.microsoft.com
* For the Google documentation refer to support.google.com

	A
1	=WORKDAY.INTL("02/01/2010",0) = 40180
2	=WORKDAY.INTL("02/01/2010",1) = 40182
3	=WORKDAY.INTL("02/01/2010",5) = 40186
4	=WORKDAY.INTL("02/01/2010",6) = 40189
5	=WORKDAY.INTL("02/01/2010",2,"04/01/2010") = #VALUE!
6	=WORKDAY.INTL("02/01/2000",2,"03/01/2000") = #VALUE!
7	=WORKDAY.INTL("02/01/2000",2,B1:B3) = #NUM!
8	=WORKDAY.INTL("02/01/2000",2,{"03/01/2000","04/01/2000"}) = #VALUE!
9	=WORKDAY.INTL("01/01/1977",7,2) = 28137
10	=WORKDAY.INTL(1/1/1977,7,2) = 11
11	=WORKDAY.INTL(DATE(1977,1,1),7,2) = 28137
12	=WORKDAY.INTL(DATEVALUE("01/03/1998"),5) = 35860
13	=WORKDAY.INTL("01/02/2000",-10000000) = #NUM!
14	=WORKDAY.INTL("30/02/2000",2) = #VALUE!
15	=WORKDAY.INTL("02/01/2000",2,"30/02/2000") = #VALUE!

1 - What is the serial number for the date that is 0 days after 2-January-2010 (40180).
2 - What is the serial number for the date that is 1 day after 2-January-2010 (40180 + 2). Because the 2nd January is Saturday, 1 day would be Monday which is 2 days after.
3 - What is the serial number for the date that is 5 days after 2-January-2010 (40180 + 6). Because the 2nd January is Saturday. 5 days would be Friday which is 6 days after.
4 - What is the serial number for the date that is 6 days after 2-January-2010 (40180 + 9). Because the 2nd January is Saturday 6 days after be the following Monday which is 9 days after.
5 - What is the serial number for the date that is 2 days after 2-January-2010 (40180 + 4). Because the 2nd January is Saturday 2 days after would be Tuesday the 5-January but since the 4-January is considered to be a holiday it will actually be Wednesday which is 4 days after.