A silly question...

I always got confused using sas date format....
Suppose i have 2 var: date1 and date2, and both are of following format: 20060901 and 20090809. I want to get a new var: diff-date which is the days between the two dates, how should i do it in data step....

data test;
   dt1="20060901";
   dt2="20090809";
   *** Convert to numeric;
   date1=input(dt1,yymmdd8.);
   date2=input(dt2,yymmdd9.);
   format date1 date2 yymmdd10.;
   diff=date2-date1;
run;

Thanks a lot!!! I kept on forgetting it all the time.... 2# pobel