_dtfmt2t(fmt)
{
        local t;

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

                case 9:
                        t = 2;
                        break;

                case 10:
                        t = 3;
                        break;

                case 13:
                        t = 4;
                        break;

                case 23:
                        t = 5;
                        break;

                case 24:
                        t = 6;
                        break;

                case 25:
                        t = 7;
                        break;

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