How can I get an Excel spreadsheet to increase a number every time it is opened?

I have an Excel spreadsheet.
I would like a specific field, ie a PO number, to increase by 1 every time the Excel spreadsheet is opened.
The date is not a problem to show for today's date, however to increase the specific field is.

How can this be done?
100questionsAsked:
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Rgonzo1971Commented:
HI,

you could use an event macro (which is placed in the Workbook module(Alt+F11)

Private Sub Workbook_Open()
    Range("A1") = Range("A1") +1
End Sub

Regards
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Rob HensonFinance AnalystCommented:
There is a VBA routine on WorkbookOpen that can be utilised. How knowledgeable on VBA are you?
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100questionsAuthor Commented:
Thanks, not very good.
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Rgonzo1971Commented:
See example

in the ThisWorkbook module (Alt+F11)

Regards
EE20141022.xlsm
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ProfessorJimJamCommented:
Do you mean like this?

if you PO number is in A2 then PO number is 00001559 and then next time you open it , it would be become 00001560

or you want another cell to be populated with 0001560 |?
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100questionsAuthor Commented:
@ProfessorjimJam - yes if the PO is 00001559 then the next time I open it, it needs to increase to 00001560.
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100questionsAuthor Commented:
Works well, thank you.
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