To my knowledge nobody ever reported a problem with the intck function. Try the following:
data _null_;
do Year = 1995 to 2016;
date28feb = mdy(2,28,year);
date01mar = mdy(3,1,year);
nbDays = intck("DAY", date28feb, date01mar);
put (_all_) (=);
end;
format date: yymmdd10.;
run;
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