Do you mean you want to get col2 from col1?
It looks like 2019-01-03 is missing and 2014-02-03 is duplicated, please provide the conditions.
What is the logic here?
how about this code?
data have;
input dt1:yymmdd10.;
format dt1 yymmdd10.;
datalines;
2019-04-09
2019-07-08
2014-02-03
;
run;
data temp;
set have;
key=_n_;
run;
proc sort data=temp;
by descending key;
run;
data next;
set temp;
retain dt2;
format dt2 yymmdd10.;
by descending key;
if _n_=1 then dt2=dt1;
output;
dt2=dt1;
run;
proc sort data=next out=want(drop=key);
by key;
run;
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