data want;
input c_start :$10. c_end :$10.;
start='1900-01-01';
end='1900-01-01';
substr(start,1,lengthn(c_start))=substr(c_start,1,lengthn(c_start));
substr(end,1,lengthn(c_end))=substr(c_end,1,lengthn(c_end));
num_start=input(start,yymmdd12.);
num_end=input(end,yymmdd12.);
format num_start num_end yymmdd10.;
datalines;
2020-02-03 2020-04-03
2020-06 2020-06
2020-12 2020-12
2020 2020
;
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