บันทึกข้อมูลแบบ datetime [vb.net] มีปัญหาเรื่องการ insert ข้อมูลที่เป็น datetime ค่ะ ไม่ทราบว่ามันต้อ

sql = "Insert Into [MOR_PO] ([POID], [PODATE], [SupplierCode]) Values (@POID, Convert(DateTime, @PODATE, 103), @SupplierCode)"

cmd = New SqlCommand(sql, Conn)
cmd.Parameters.Add("@POID", SqlDbType.NVarChar).Value = PO_ID
cmd.Parameters.Add("@PODATE", SqlDbType.NVarChar).Value = PO_Date
cmd.Parameters.Add("@SupplierCode", SqlDbType.NVarChar).Value = PO_SupCode

Conn.Open()
cmd.ExecuteNonQuery()
Conn.Close()

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        myDate = Date.Now
        Dim  Sys_Date  as string
        Dim  Sys_DateTime as string
        'Sys_Date = FormatDateTime(myDate, DateFormat.LongDate)
        'Txt_Date.Text = Sys_Date
        'Sys_Date = Txt_Date.Text
        'Sys_Date = myDate.ToString("dd/MM/yyyy")
        'Txt_Date.Text = Sys_Date
        Sys_DateTime = FormatDateTime(myDate, DateFormat.GeneralDate)
        Txt_Time.Text = Sys_DateTime
        Sys_Time = Txt_Time.Text '
        Sys_DateTime = myDate.ToString("MM/dd/yyyy HH:mm:ss tt")    
        Txt_Time.Text = Sys_DateTime
        '\\ Link http://www.geekzilla.co.uk/View00FF7904-B510-468C-A2C8-F859AA20581F.htm
End Sub