- Private Function SumarMes(fecha As Date) 
- Dim f As Variant 
-     On Error GoTo xError 
-     f = Split(Format(fecha, "dd/mm/yyyy"), "/") 
-      
-     If f(1) < 12 Then 
-         f(1) = f(1) + 1 
-     Else 
-         f(1) = 1 
-         f(2) = f(2) + 1 
-     End If 
-     SumarMes = DateValue(f(0) & "/" & f(1) & "/" & f(2)) 
-     Exit Function 
-      
- xError: 
-     SumarMes = #1/1/1900# 
- End Function 
-