I guess it wasn't clear to me that the OP wanted these cells
automatically updated every time somebody entered something in ANY cell,
so I left it this way to provide more flexibility. If it needs to be
called anytime any cell is changed on this same worksheet (or any other
worksheet, for that matter), then put this code in the Worksheet_Change
event handler for this (or any other) worksheet (it simply calls the
StampTime routine):

'----------------------------------------------------------------------
Private Sub Worksheet_Change(ByVal Target As Range)
StampTime
End Sub

As a matter of programming flexibility, this is a better way to do event
routines anyway. I can print out the standard code module, and have
virtually all of the code, without having to go check each worksheet and
chart code module.
--
Regards,
Bill Renaud