First insert a special worksheet named "record". Then install the following
event macro in the workbook code area:
Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
Dim w1 As Worksheet
Dim w2 As Worksheet
Set w1 = ActiveSheet
Set w2 = Sheets("record")
w2.Activate
If Cells(1, 1).Value = "" Then
i = 1
Else
i = Cells(Rows.Count, 1).End(xlUp).Row + 1
End If
Cells(i, 1).Value = Now
w1.Activate
End Sub
Each time the file is saved the date/time will be recorded in the new tab.
Because it is workbook code, it is very easy to install and use:
1. right-click the tiny Excel icon just to the left of File on the Menu Bar
2. select View Code - this brings up a VBE window
3. paste the stuff in and close the VBE window
If you save the workbook, the macro will be saved with it.
To remove the macro:
1. bring up the VBE windows as above
2. clear the code out
3. close the VBE window
To learn more about macros in general, see:
http://www.mvps.org/dmcritchie/excel/getstarted.htm
To learn more about Event Macros (workbook code), see:
http://www.mvps.org/dmcritchie/excel/event.htm