Help on Excel formula to increase invoice number based on date change

I have an excel spreadsheet that I use for invoicing a client.  I would like to create an "if then" formula so that when a date changes in one of the cells, the cell that contains the invoice number will increment by 1.

For example, my date is 01/01/2013 and my invoice number is 2013-001.  What I would like to happen is that anytime the date changes, the invoice will automatically update, so if the next time I open this file and the date changes to 01/04/2013 then I would like the invoice number to automatically update to 2013-002, hopefully this makes sense, thank you.
WJMAsked:
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Robberbaron (robr)Connect With a Mentor Commented:
yes this makes sense as i do something very similar.

What it requires is a hidden cell to hold the date the last time the invoice was updated.  I use a Status sheet that is hidden.

Does the cell with date automatically update when the workbook is opened, or is this something the user does ?   This determines the method we use to check for date change.
Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)
    If Target.Address = Range("Newdate").Address Then
        'date was changed
        GetInvoice
    End If
End Sub

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Sub GetInvoice()
    Dim Prevdate As Date, NewDate As Date, PrevInv As Integer
    Dim newInv As Integer
    NewDate = Range("Newdate").Value
    Prevdate = Range("Prevdate").Value
    PrevInv = Range("PrevInv").Value
       
    If NewDate > Prevdate Then
        'this is a new invoice
        If Year(NewDate) = Year(Prevdate) Then
            'use next number
            newInv = PrevInv + 1
         Else
            newInv = 1
        End If
        
        'update the saved data
       Range("Prevdate").Value = NewDate
       Range("PrevInv").Value = newInv
     Else
        newInv = PrevInv
        
    End If
    
    Range("Invoice").Value = Format(NewDate, "yyyy-") & Format(newInv, "000")
    
    
        
End Sub

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sample-invoice.xls
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WJMAuthor Commented:
Yes, that's it baron; however, how do I get the Sub codes to work properly, I'm not an expert at Excel and though I see how the cells are working in your sample you provide I do not know how to duplicate that in my Excel file, thank you.
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Robberbaron (robr)Commented:
you need to open the devloper tab.  Copy and paste the code in to your workbook.

The Workbook_SheetChange sub goes into the Workbook object.
Need to create a user module for the other code. (one way is to record a macro).

And then create the named ranges to suit your workbook.
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tweakmastersCommented:
There are few more thing that need to be clarified before your can apply a good patch for your problem. Can you please clarify if you have only one sheet where you want the number changed accordingly to date or do you open multiple sheets (do you keep or discard previous invoice records)? From your description seems like you don't keep previous records.
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WJMAuthor Commented:
tweakmasters, it is only one sheet.  I update that sheet, save it, save to PDF and close, the next week I open up the previous weeks excel file, update it with the current weeks information and do the save and close process again.  Records are kept as PDF's but the Excel file is always updated...
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Robberbaron (robr)Commented:
my invoice workbook is surprisingly similar. I have done the PDF creation as a macro that saves the PDF with a date in filename.
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WJMAuthor Commented:
Thank you very much.
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