Update database and datagridview with a date parameter with data mismatch

I have a data mismatch error with my modifiedDate parameter. I am trying to update my database from a DataGridView and when I click the update button it captures what I need except for the date.

    Dim modDate = Date.Now
    Dim updateQuery As String = "UPDATE dbo_TblCustomerNumbers_copy Set [PrintImaLabels]= '" & dgCustomerNumber.CurrentRow.Cells(2).Value & "', " _
                                & " [PrintCustLabels]= '" & dgCustomerNumber.CurrentRow.Cells(3).Value & "', " _
                                & " [PrintBVILabels]= '" & dgCustomerNumber.CurrentRow.Cells(4).Value & "', [PrintMatlLabels]= '" & dgCustomerNumber.CurrentRow.Cells(5).Value & "', " _
                                & " [PrintPaperPacket]= '" & dgCustomerNumber.CurrentRow.Cells(6).Value & "', [PrintLabelPacket]= '" & dgCustomerNumber.CurrentRow.Cells(7).Value & "', " _
                                & " [Print4100Pkg]= '" & dgCustomerNumber.CurrentRow.Cells(9).Value & "', [Print4100PkgItem]= '" & dgCustomerNumber.CurrentRow.Cells(10).Value & "', " _
                                & " [PrintCarb]= '" & dgCustomerNumber.CurrentRow.Cells(11).Value & "', [NoPrintCustLabels]= '" & dgCustomerNumber.CurrentRow.Cells(12).Value & "', " _
                                & " [ModifiedDate]= @modifyDate  WHERE [CustNo]= " & dgCustomerNumber.CurrentRow.Cells(0).Value

        OleDBConn1.Open()
        Dim cmd As New OleDbCommand(updateQuery, OleDBConn1)
        cmd.Parameters.Add("@modifyDate", OleDbType.Date).Value = modDate

        cmd.ExecuteNonQuery()
        dgCustomerNumber.Update()
        OleDBConn1.Close()

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