[AccessD] MSAccess 2007 - Count days

Hi Kostas

Here is the function we use:

Public Function ISO_WorkdayDiff( _
  ByVal datDateFrom As Date, _
  ByVal datDateTo As Date) _
  As Long

' Purpose: Calculate number of working days between dates datDateFrom and datDateTo.
' Assumes: 5 or 6 working days per week. Weekend is (Saturday and) Sunday.
' Limitation: Does not count for public holidays.
' May be freely used and distributed.
' 1999-04-23. Gustav Brock, Cactus Data ApS, Copenhagen
' 2000-10-03. Constants added.
'             Option for 5 or 6 working days per week added.

  Const cbytWorkdaysOfWeek  As Byte = 5

  Dim bytSunday             As Byte
  Dim intWeekdayDateFrom    As Integer
  Dim intWeekdayDateTo      As Integer
  Dim lngDays               As Long
  Dim datDateTemp           As Date
  
  ' Reverse dates if these have been input reversed.
  If datDateFrom > datDateTo Then
    datDateTemp = datDateFrom
    datDateFrom = datDateTo
    datDateTo = datDateTemp
  End If
  
  ' Find ISO weekday for Sunday.
  bytSunday = WeekDay(vbSunday, vbMonday)
  
  ' Find weekdays for the dates.
  intWeekdayDateFrom = WeekDay(datDateFrom, vbMonday)
  intWeekdayDateTo = WeekDay(datDateTo, vbMonday)
  
  ' Compensate weekdays' value for non-working days (weekends).
  intWeekdayDateFrom = intWeekdayDateFrom + (intWeekdayDateFrom = bytSunday)
  intWeekdayDateTo = intWeekdayDateTo + (intWeekdayDateTo = bytSunday)
  
  ' Calculate number of working days between the two weekdays, ignoring number of weeks.
  lngDays = intWeekdayDateTo - intWeekdayDateFrom - (cbytWorkdaysOfWeek * (intWeekdayDateTo < intWeekdayDateFrom))
  ' Add number of working days between the weeks of the two dates.
  lngDays = lngDays + (cbytWorkdaysOfWeek * DateDiff("w", datDateFrom, datDateTo, vbMonday, vbFirstFourDays))
  
  ISO_WorkdayDiff = lngDays

End Function

To exclude holidays, look up and count the holidays from a table of holidays not falling in weekends; substract this number from the count of working days.

/gustav

>>> kost36 at otenet.gr 15-11-07 20:49 >>>
Hi all,

Does anybody know how it could be possible to count
the work days between two days excluding weekends and local holidays
To my coutry there are several dates as holidays and some of them 
are moving year by year

many thank's to all

/kostas
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