_dtt2fmt(t)
{
        local fmt;

        switch (t)
        {
                case 1:
                        fmt = 8;
                        break;

                case 2:
                        fmt = 9;
                        break;

                case 3:
                        fmt = 10;
                        break;

                case 4:
                        fmt = 13;
                        break;

                case 5:
                        fmt = 23;
                        break;

                case 6:
                        fmt = 24;
                        break;

                case 7:
                        fmt = 25;
                        break;

                default:
                        fmt = 0;
                        break;
        }
        return(fmt);
}