求助日期存贮方式是12OCT2012时，我用了下面红色字体这种方式读取是可以的。
  data temp_day&i.;
  set or.vp_op_np_pack;
  where cal_date="&&cal_date&i."d;
  run;

但现在遇到这种方式存贮的日期20121015，尝试了以下几种方式读取都不行；
cal_date="&&cal_date&i."d;
ERROR: Invalid date/time/datetime constant "20121015"d.
ERROR: Syntax error while parsing WHERE clause.



cal_date="&&cal_date&i.";
ERROR: WHERE clause operator requires compatible variables.


cal_date=&&cal_date&i.
ERROR: Some character data was lost during transcoding in the dataset WORK.TEMP_DAY1. Either the data
       contains characters that are not representable in the new encoding or truncation occurred
       during transcoding.


然后想把日期换成最开始那种存贮方式，我查到说这种格式叫DATE9. 然后用了format如下，但还是不行。
format cal_date DATE9.;
ERROR: Some character data was lost during transcoding in the dataset WORK.TEMP_DAY2. Either the data
       contains characters that are not representable in the new encoding or truncation occurred
       during transcoding.


求指教，非常感谢！