Bob (aka XLD),

Thanks for your help.

Here is my solution of Dave Lecki's time entry problem as a user-invokable macro.
[vba]Sub FormatTimeEntry()
'
' FormatTimeEntry Macro
' Macro recorded 9/26/2008 by Ron McKenzie
'
' Keyboard Shortcut: Option+Cmd+Shift+F
'
' Original solution from Chip Pearson (www.cpearson.com)
'
Dim TimeStr As String
On Error GoTo EndMacro
'// Change Range() for the actual case
'// Bail if cell is empty
If ActiveCell.Value = "" Then
Exit Sub
End If
Application.EnableEvents = False
With ActiveCell
'// do not execute if formula in cell
If .HasFormula = False Then
Select Case Len(.Value)
Case 1 ' e.g., 1 = 00:01 AM
TimeStr = "00:0" & .Value
Case 2 ' e.g., 12 = 00:12 AM
TimeStr = "00:" & .Value
Case 3 ' e.g., 735 = 7:35 AM
TimeStr = Left(.Value, 1) & ":" & _
Right(.Value, 2)
Case 4 ' e.g., 1234 = 12:34
TimeStr = Left(.Value, 2) & ":" & _
Right(.Value, 2)
Case 5 ' e.g., 12345 = 1:23:45 NOT 12:03:45
TimeStr = Left(.Value, 1) & ":" & _
Mid(.Value, 2, 2) & ":" & Right(.Value, 2)
Case 6 ' e.g., 123456 = 12:34:56
TimeStr = Left(.Value, 2) & ":" & _
Mid(.Value, 3, 2) & ":" & Right(.Value, 2)
Case Else
Err.Raise 0
End Select
.Value = TimeValue(TimeStr)
.NumberFormat = "h:mm:ss"
End If
End With
Application.EnableEvents = True
Exit Sub

EndMacro:
MsgBox "You did not enter a valid time"
Application.EnableEvents = True
End Sub
[/vba]
Cheers,