Display last date workbook was modified?

I would like to have a cell display the last date a workbook was modified.
What would the code for that be?

Thanks in advance for any help.

You could use a Worksheet_change or Workbook_beforesave macro to populate a cell with the current date/time.

e.g.

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
Sheets(1).Cells(1, 1) = Date
End Sub

pasted into the thiswokbook tab in the VBA editor (Shift F11)