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

Posted on 2013-01-08
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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.
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Question by:WJM
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LVL 32

Accepted Solution

Robberbaron (robr) earned 500 total points
ID: 38757503
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)
'date was changed
GetInvoice
End If
End Sub
``````
``````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
``````
sample-invoice.xls
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Author Comment

ID: 38761291
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.
0

LVL 32

Expert Comment

ID: 38761430
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.
0

Expert Comment

ID: 38766232
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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Author Comment

ID: 38780157
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...
0

LVL 32

Expert Comment

ID: 38781249
my invoice workbook is surprisingly similar. I have done the PDF creation as a macro that saves the PDF with a date in filename.
0

Author Closing Comment

ID: 38901716
Thank you very much.
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