Yes, I was on my way out to lunch, so didn't test it.  Just change the format: data have; test_date=20070325; dob=19800106; run; data want; set have; real_date_test_date=input(put(test_date,8.),yymmdd8.); real_date_dob_date=input(put(dob,8.),yymmdd8.); diff_in_months=intck('month',real_date_dob_date,real_date_test_date); run; ... View more

An array sets up the list of variables that will be looped through. So you would list all your variables after the array name. Array <arrayname>(<num elemements>) list_of_variables; The Do/End is a loop to loop through all variables set up in the array. You may want to review some papers on Lexjansen.com on array processing. ... View more