data a;
input id date $10.;
dt=input(date,anydtdte19.);
cards;
1 1991/3/30
1 1996/6/21
2 1994/3/21
2 1995/6/2
2 1992/3/6
;
proc sort;by id dt;
run;


data b;
set a;
do ii=-5 to 5;
dtt=dt+ii;output;
end;
format dtt dt date9.;
run;