Jonathan,

Here is the worksheet change code that assumes the time is recorded in A1.
You will need to add protection as well

Private Sub Worksheet_Change(ByVal Target As Range)
Const WS_RANGE As String = "C12:F37"

On Error GoTo ws_exit:
Application.EnableEvents = False
If Not Intersect(Target, Me.Range(WS_RANGE)) Is Nothing Then
With Target
If Me.Range("A1").Value = "" Then
Me.Range("A1").Value = Now
End If
End With
End If

ws_exit:
Application.EnableEvents = True
End Sub

'This is worksheet event code, which means that it needs to be
'placed in the appropriate worksheet code module, not a standard
'code module. To do this, right-click on the sheet tab, select
'the View Code option from the menu, and paste the code in.




--

HTH

RP
(remove nothere from the email address if mailing direct)


"Jonathan" wrote in message
...
Hi

I am totally new to VBA and really need to do some help!

I am writing an excel worksheet to send to students practising for multi
choice exams. They are supposed to press a button when they start the
paper
which will then record the start time in a box. I have written a macro
that
does this and protects the cell so that the time cannot then be changed
but I
want it to automatically run if they answer any questions without pressing
the start button.

My idea for doing this is to use the worksheet_change function to watch
the
cells into which the answers would go (namely C12:F37) and if any of those
are changed run the starttime macro.

Can anyone tell me how to do this or give me some code that would work.

Many Thanks

Jonathan