Hi, Dennis ,
welcome to ExcelForum. 
If you use Excel2003 as stated in the profile you have to check if things work okay, workbook was created with Excel2013 and should work from Excel2007 on. Feel free to have a look at it, I introduced three areas for Data Valiudation on Sheet Data while the entries will be made on Sample. Just use TAB to create a new line in the Table and choose from the entries.
Code behind Sheet Sample:
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Count > 1 Then Exit Sub
If Not Intersect(Target, Range("C:C")) Is Nothing Then
ActiveSheet.Unprotect
Range("A:B").Locked = False
Application.EnableEvents = False
With Cells(Target.Row, "A")
If .Value = "" Then .Value = Date
If .Offset(0, 1).Value = "" Then .Offset(0, 1).Value = Format(Time, "'hhmm")
End With
Application.EnableEvents = True
Range("A1:F" & Target.Row - 1).Locked = True
Range("A:B").Locked = True
ActiveSheet.Protect
End If
End Sub
Ciao,
Holger
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