that is the conclusion wrt the operation of the 2 functions that I had reached. However, if I apply the proposed solution to the second of my 2 dates (01/09/2012) I end up with a date difference of 0 (1-1) which gives me back 01/09/2012 rather than 03/09/2012.

It appears the 1 must be substracted iff the first day of the period is a working day! It seems very strange to me.

Regards.

Andy

For 1-Sep to 3-Sep, NWD returns 1 (3-Sep is the only workday in that range). When you add 1 to 1-Sep you get 2-Sep. Since 2-Sep is a Sunday, it jumps ahead to 3-Sep.

If you use NETWORKDAYS as an input to WORKDAY, you have to subtract 1.

I’ve used your exact formula and get the following results (my date format is dd/mm/yyyy):

A1 (C259): 01/08/2012
A2 (C260): 03/08/2012
Result: 06/08/2012

A1 (C259): 01/09/2012
A2 (C260): 03/09/2012
Result: 03/09/2012

I used =WORKDAY(C259,NETWORKDAYS(C259,C260,PublicHolidays),PublicHolidays)for both caluations. I also tried it with and without public holidays, same answer.

I don’t understand why I get different results to you (I am using Excel 2010 under Windows 7) nor why I get a sdifferent result if the start date is a workday or not.

Regards.

Andy

for a particular scheduling worksheet I am developing, I need to to add the net working days between two dates (forecast start & end) to a later (or earlier)actual start date to get an indicative end date. I am finding that inputing the output of Networkdays into the Workday function does not appear to give me the correct answer when the start of the workday period is itself a workday, see example below. However, if the 1st day of the new period is a weekend or holiday the answer is correct.

Can anyone assist as to whether this is a misuse of these functions, a malfunction or Networkdays includes the first day in its calculations whereas Workday does not (and where that behaviour is documented?

NetWorkdays
Start 1/08/2012 0:001/09/2012 0:00
End 3/08/2012 0:003/09/2012 0:00
Public holidaysPublic holidaysPublic holidays
Worksdays 3 1

Workday
Start 1/08/2012 0:001/09/2012 0:00
Workdays 3 1
Public HolidaysPublic holidaysPublic holidays
End 6/08/2012 0:003/09/2012 0:00
FALSE TRUE

Thanks.

(date+2 days) – weekends.

Please advise.

Public Function BizDateDiff(ByVal varDateStart As Date, ByVal varDateEnd As Date, FirstDayNumber, WkDaysInWk, Holidays) As Integer
‘ DayNumber (sunday =1,monday=2…)
Dim varNextDate As Date
Dim WkEnd1, WkEnd2, WkEnd3, WkEnd4, WkEnd5, WkEnd6, WkEnd7 As Integer

‘This function calculates the weekdays between two dates.
‘Exit if variables not a valid date
If Not IsDate(varDateStart) Or Not IsDate(varDateEnd) Or WkDaysInWk 7 Or FirstDayNumber 7 Then
BizDateDiff = 0
Exit Function
End If

Select Case WkDaysInWk
Case 7
WkEnd1 = 0
WkEnd2 = 0
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 6
Select Case FirstDayNumber
Case 1
WkEnd1 = 7
WkEnd2 = 7
WkEnd3 = 7
WkEnd4 = 7
WkEnd5 = 7
WkEnd6 = 7
WkEnd7 = 7

Case 2
WkEnd1 = 1
WkEnd2 = 1
WkEnd3 = 1
WkEnd4 = 1
WkEnd5 = 1
WkEnd6 = 1
WkEnd7 = 1
Case 3
WkEnd1 = 2
WkEnd2 = 2
WkEnd3 = 2
WkEnd4 = 2
WkEnd5 = 2
WkEnd6 = 2
WkEnd7 = 2
Case 4
WkEnd1 = 3
WkEnd2 = 3
WkEnd3 = 3
WkEnd4 = 3
WkEnd5 = 3
WkEnd6 = 3
WkEnd7 = 3
Case 5
WkEnd1 = 4
WkEnd2 = 4
WkEnd3 = 4
WkEnd4 = 4
WkEnd5 = 4
WkEnd6 = 4
WkEnd7 = 4
Case 6
WkEnd1 = 5
WkEnd2 = 5
WkEnd3 = 5
WkEnd4 = 5
WkEnd5 = 5
WkEnd6 = 5
WkEnd7 = 5
Case 7
WkEnd1 = 6
WkEnd2 = 6
WkEnd3 = 6
WkEnd4 = 6
WkEnd5 = 6
WkEnd6 = 6
WkEnd7 = 6
End Select
Case 5
Select Case FirstDayNumber
Case 1
WkEnd1 = 6
WkEnd2 = 7
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 2
WkEnd1 = 7
WkEnd2 = 1
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 3
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 4
WkEnd1 = 2
WkEnd2 = 3
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 5
WkEnd1 = 3
WkEnd2 = 4
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 6
WkEnd1 = 4
WkEnd2 = 5
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 7
WkEnd1 = 5
WkEnd2 = 6
WkEnd3 = 0
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
End Select
Case 4
Select Case FirstDayNumber
Case 1
WkEnd1 = 5
WkEnd2 = 6
WkEnd3 = 7
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 2
WkEnd1 = 6
WkEnd2 = 7
WkEnd3 = 1
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 3
WkEnd1 = 7
WkEnd2 = 1
WkEnd3 = 2
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 4
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 5
WkEnd1 = 2
WkEnd2 = 3
WkEnd3 = 4
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 6
WkEnd1 = 3
WkEnd2 = 4
WkEnd3 = 5
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 7
WkEnd1 = 4
WkEnd2 = 5
WkEnd3 = 6
WkEnd4 = 0
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
End Select

Case 3
Select Case FirstDayNumber
Case 1
WkEnd1 = 4
WkEnd2 = 5
WkEnd3 = 6
WkEnd4 = 7
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 2
WkEnd1 = 5
WkEnd2 = 6
WkEnd3 = 7
WkEnd4 = 1
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 3
WkEnd1 = 6
WkEnd2 = 7
WkEnd3 = 1
WkEnd4 = 2
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 4
WkEnd1 = 7
WkEnd2 = 1
WkEnd3 = 2
WkEnd4 = 3
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 5
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 6
WkEnd1 = 2
WkEnd2 = 3
WkEnd3 = 4
WkEnd4 = 5
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
Case 7
WkEnd1 = 3
WkEnd2 = 4
WkEnd3 = 5
WkEnd4 = 6
WkEnd5 = 0
WkEnd6 = 0
WkEnd7 = 0
End Select

Case 2
Select Case FirstDayNumber
Case 1
WkEnd1 = 3
WkEnd2 = 4
WkEnd3 = 5
WkEnd4 = 6
WkEnd5 = 7
WkEnd6 = 0
WkEnd7 = 0
Case 2
WkEnd1 = 4
WkEnd2 = 5
WkEnd3 = 6
WkEnd4 = 7
WkEnd5 = 1
WkEnd6 = 0
WkEnd7 = 0
Case 3
WkEnd1 = 5
WkEnd2 = 6
WkEnd3 = 7
WkEnd4 = 1
WkEnd5 = 2
WkEnd6 = 0
WkEnd7 = 0
Case 4
WkEnd1 = 6
WkEnd2 = 7
WkEnd3 = 1
WkEnd4 = 2
WkEnd5 = 3
WkEnd6 = 0
WkEnd7 = 0
Case 5
WkEnd1 = 7
WkEnd2 = 1
WkEnd3 = 2
WkEnd4 = 3
WkEnd5 = 4
WkEnd6 = 0
WkEnd7 = 0
Case 6
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 0
WkEnd7 = 0
Case 7
WkEnd1 = 2
WkEnd2 = 3
WkEnd3 = 4
WkEnd4 = 5
WkEnd5 = 6
WkEnd6 = 0
WkEnd7 = 0
End Select

Case 1

Select Case FirstDayNumber
Case 1
WkEnd1 = 2
WkEnd2 = 3
WkEnd3 = 4
WkEnd4 = 5
WkEnd5 = 6
WkEnd6 = 7
WkEnd7 = 0
Case 2
WkEnd1 = 3
WkEnd2 = 4
WkEnd3 = 5
WkEnd4 = 6
WkEnd5 = 7
WkEnd6 = 1
WkEnd7 = 0
Case 3
WkEnd1 = 4
WkEnd2 = 5
WkEnd3 = 6
WkEnd4 = 7
WkEnd5 = 1
WkEnd6 = 2
WkEnd7 = 0
Case 4
WkEnd1 = 5
WkEnd2 = 6
WkEnd3 = 7
WkEnd4 = 1
WkEnd5 = 2
WkEnd6 = 3
WkEnd7 = 0
Case 5
WkEnd1 = 6
WkEnd2 = 7
WkEnd3 = 1
WkEnd4 = 2
WkEnd5 = 3
WkEnd6 = 4
WkEnd7 = 0
Case 6
WkEnd1 = 7
WkEnd2 = 1
WkEnd3 = 2
WkEnd4 = 3
WkEnd5 = 4
WkEnd6 = 5
WkEnd7 = 0
Case 7
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 0
End Select
Case 0

Select Case FirstDayNumber
Case 1
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 7
Case 2
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 7
Case 3
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 7
Case 4
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 7
Case 5
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 7
Case 6
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 7
Case 7
WkEnd1 = 1
WkEnd2 = 2
WkEnd3 = 3
WkEnd4 = 4
WkEnd5 = 5
WkEnd6 = 6
WkEnd7 = 7
End Select
End Select

varNextDate = varDateStart
BizDateDiff = 0

While Not (varDateEnd = varNextDate)
If Not (Weekday(varNextDate) = WkEnd1 Or Weekday(varNextDate) = WkEnd2 Or Weekday(varNextDate) = WkEnd3 Or _
Weekday(varNextDate) = WkEnd4 Or Weekday(varNextDate) = WkEnd5 Or Weekday(varNextDate) = WkEnd6 _
Or Weekday(varNextDate) = WkEnd7) Then
BizDateDiff = BizDateDiff + 1
End If

varNextDate = varNextDate + 1

Wend
BizDateDiff = BizDateDiff – Holidays
End Function

I have a starting date
I want to add 1 business day & 2 business days to this – I have that figured out with workday and adding holidays.

But then to this starting day I want to add 30 days & 45 days. Not workday – but actual days. If the calculated date falls on a weekend, I want a formula to move this to the next business day.

Can you help me with this?

Regards