Date Calculation

I need a excel formula or a VBA to solve this...

I pay my supplier invoice on the 14th day from the date of invoice (including weekends and holidays). However for him to be paid on the 14th day, i need to kick start a process 4 working days earlier than the due date. If the 14th day is a holiday then i would need to pay him on the 13th day and i would still need to have a gap of 4 working days prior.

Can you please help ?
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dvivek_acaAsked:
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byundtCommented:
You can use the NETWORKDAYS and WORKDAY functions to return your payment date and process start dates.

If cell A1 contains the invoice date, then the payment date (taking holidays into account) is:
=WORKDAY(A1,NETWORKDAYS(A1,A1+14,Holidays)-1,Holidays)

The process start date (four business working days earlier) is given by:
=WORKDAY(A1,NETWORKDAYS(A1,A1+14,Holidays)-5,Holidays)

Holidays is a named range that contains a list of all your business holidays. You could alternatively use a fixed address range like $D$2:$D$13 instead of creating the named range Holidays.

If you see #NAME? as the result, then you need to enable the Analysis ToolPak add-in using the Tools...Add-Ins menu item. Just check the box for Analysis ToolPak (and ignore the checkbox for Analysis ToolPak - VBA). You won't have this problem in Excel 2007 because the Analysis ToolPak functions are enabled by default.

Brad
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Saurabh Singh TeotiaCommented:
Hi,
Can you please upload your sample file, Along with what the holidays that you consider? Also with the result that you are looking for..
Saurabh...
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dvivek_acaAuthor Commented:
Here we go with sample data
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Bill-HansonCommented:
You will need a record stored somewhere that defines your working days and your holidays.  I store mine in a central configuration database in Lotus Notes.  The form has a field for workdays ("Mon|2":"Tue|3":"Wed|4":"Thu|5":"Fri|6":"Sat|7":"Sun|1") and a multi-value date field for entering holidays.

Once you have this setup, your VBA code can get the document and use the information to calculate the date you need.

I've provided some sample code below that illustrates the concept.
Sub Test()
  
  Dim sess As Object, db As Object, calendar As Object
  Dim workdays As Variant, holidays As Variant
  
  ' init session
  Set sess = CreateObject("Lotus.NotesSession")
  sess.Initialize ("")
  
  ' get workdays and holidays
  Set db = sess.GetDatabase("Server/Domain", "applications\config.nsf", False)
  Set calendar = db.GetDocumentById("27AE")
  workdays = calendar.GetItemValue("WorkDays")
  holidays = calendar.GetItemValue("Holidays")
  
  ' start with the invoice date
  Dim targetDate As Date
  targetDate = DateSerial(2009, 5, 1)
  
  ' add 14 days
  targetDate = DateAdd("d", 14, targetDate)
  
  ' check workdays
  Do While (Not ArrayIsMember(workdays, CStr(Weekday(targetDate))))
    targetDate = DateAdd("d", -1, targetDate)
  Loop
  
  ' check holidays
  Do While (ArrayIsMember(holidays, CStr(targetDate)))
    targetDate = DateAdd("d", -1, targetDate)
  Loop
  
  ' now, just subtract the 4 days
  targetDate = DateAdd("d", -4, targetDate)
  
  MsgBox CStr(targetDate)
  
End Sub
 
Function ArrayIsMember(source As Variant, value As String) As Boolean
  ArrayIsMember = True
  Dim entry As Variant
  For Each entry In source
    If (entry = value) Then Exit Function
  Next
  ArrayIsMember = False
End Function

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barry houdiniCommented:
I'm not sure it needs to be as complicated as Brad's suggestion. For process start date try the following:
=WORKDAY(A1+15,-5,holidays)
where A1 contains invoice date and holidays a list of holiday dates
regards, barry
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dvivek_acaAuthor Commented:
Thanks for both the solutions. I however had to do a macro to determine the due date that was neither a weekend or a holiday. From thereon the formulae helped me to get the date to initiate the payment.

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byundtCommented:
Using barryhoudini's approach, the due date is given by:
=WORKDAY(A1+15,-1,holidays)
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