SAS - stack data with dates using a macro

sas_stack_data_macro_SAS_91.sas

    *sample data sets for demonstration;
    data price_20080131;
    set sashelp.class;
    test=1;
    run;

    data price_20080229;
    set sashelp.class;
    test=2;
    run;

    %macro stack_data_add_date(start_date=, end_date=, outData=, debug=);

        %*get parameters for looping, primarily the number of intervals;
        data _null_;
            start_date= input("&start_date", yymmdd10.);
            end_date = input("&end_date", yymmdd10.);
            n_intervals = intck('month', start_date, end_date);

            call symputx('start_date', start_date, 'l');
            call symputx('end_date', end_date, 'l');
            call symputx('n_intervals', n_intervals, 'l');
        run;

        %*loop from 0 - starting time to end;
        %do i=0 %to &n_intervals;

        %*determine end of month date for dataset name;
        %let date = %sysfunc(intnx(month, &start_date, &i., e));

        %*output statistics for testing;
        %if &debug=Y %then %do;
            %put &n_intervals;
            %put &start_date;
            %put &end_date;
        %end;

        %*create a view with the data and date added in;
        data _temp / view=_temp;
        set price_%sysfunc(putn(&date, yymmddn8.));
        date = &date.;
        format date date9.;
        run;

        %*insert into master table;
        proc append base=&outData data=_temp;
        run;

        %*delete view so it doesn't exist for next loop;
        proc datasets lib=work nodetails nolist;
        delete _temp / memtype=view;
        run;quit;

    %end;


    %mend;

    *test;
    %stack_data_add_date(start_date=20080131, end_date=20080229, outData=want, debug=Y);