Calculating Networkdays

[jsiketa]

Hi, I have used the below WorkingDays function to calculate the number of weekdays between two dates (excluding holidays referenced from a table called tblHolidays). It appears the function does not always calculate the days correctly and is out by a day. Is there a way of full proofing this?
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Public Function WorkingDays(StartDate As Date, EndDate As Date) As Integer
'................................................. ...................
' Name: WorkingDays
' Inputs: StartDate As Date
' EndDate As Date
' Returns: Integer
' Author: Arvin Meyer
' Date: May 5,2002
' Comment: Accepts two dates and returns the number of weekdays between them
' Note that this function has been modified to account for holidays. It requires a table
' named tblHolidays with a field named HolidayDate.
'................................................. ...................
On Error GoTo Err_WorkingDays

Dim intCount As Integer
Dim rst As DAO.Recordset
Dim DB As DAO.Database

Set DB = CurrentDb
Set rst = DB.OpenRecordset("SELECT [HolidayDate] FROM tblHolidays", dbOpenSnapshot)

StartDate = StartDate + 1
'To count StartDate as the 1st day comment out the line above

intCount = 0

Do While StartDate <= EndDate

rst.FindFirst "[HolidayDate] = #" & StartDate & "#"


If Weekday(StartDate) <> vbSunday And Weekday(StartDate) <> vbSaturday Then
If rst.NoMatch Then intCount = intCount + 1
End If

StartDate = StartDate + 1

Loop

WorkingDays = intCount

Exit_WorkingDays:
Exit Function

Err_WorkingDays:
Select Case Err

Case Else
MsgBox Err.Description
Resume Exit_WorkingDays
End Select

End Function

'*********** Code End **************

[llkhoutx]

Search the Internet, I've seen this algorithm before.