Public Sub Main()
    Debug.Print Format$(CDateEx("Sep 16 2008 18:40:07", "mdy"), "dmyyyy hh:nn:ss")
    Debug.Print Format$(CDateEx("17 9 2008 18:40:07", "dmy"), "dmyyyy hh:nn:ss")
    Debug.Print Format$(CDateEx("18-2008-Sep 18:40:07", "dym"), "dmyyyy hh:nn:ss")
    Debug.Print Format$(CDateEx("2008/sep/8 18:40:07", "ymd"), "dmyyyy hh:nn:ss")
End Sub
    
Public Function CDateEx(ss As String, Optional ByVal ymd As String = "ymd") As Date
    Dim i As Integer, st As String, sd As String, v As Variant, s As String, k As Integer, _
        m As Integer, d As Integer, y As Integer, j As Integer
    
    ymd = LCase$(ymd)
    i = InStrRev(ss, " ")
    If i Then
        st = Mid$(ss, i)
        ss = Trim$(Left$(ss, i - 1))
    End If
    
    ss = Replace(ss, "-", " ")
    ss = Replace(ss, "/", " ")
    ss = Replace(ss, ".", " ")
    
    v = Split(ss, " ")
    On Error GoTo Err_
    For i = 0 To UBound(v)
        s = v(i)
        If Len(s) Then
            k = k + 1
            If k = 4 Then GoTo Err_
            Select Case Mid$(ymd, k, 1)
                Case "d"
                    If IsNumeric(s) Then
                        d = CInt(s)
                        If d < 1 Or d > 31 Then GoTo Err_
                    End If
                Case "m"
                    If IsNumeric(s) Then
                        m = CInt(s)
                        If m < 1 Or m > 12 Then GoTo Err_
                    Else
                        s = LCase(Left$(s, 3))
                        For j = 1 To 34 Step 3
                            If s = Mid$("janfebmaraprmayjunjulaugsepoctnovdec", j, 3) Then
                                m = (j + 2) / 3: Exit For
                            End If
                        Next j
                    End If
                    If m = 0 Then GoTo Err_
                Case "y"
                    If IsNumeric(s) Then y = CInt(s)
            End Select
        End If
    Next i
    CDateEx1 = CDate(Format$(DateSerial(y, m, d), "yyyy.mm.dd") & " " & st)
    CDateEx = Format(CDateEx1, "dd-mm-yyyy")
    Exit Function

Err_:
    Err.Raise 513, , "&#209;&#242;&#240;&#238;&#234;&#224; &#241; &#228;&#224;&#242;&#238;&#233; &#241;&#238;&#228;&#229;&#240;&#230;&#232;&#242; &#238;&#248;&#232;&#225;&#234;&#243;"
End Function