Initially, I tried to run the code below, where edate and ddate were originally non-negative integers (0, 1, 2, ...). However, when edate or ddate were originally 0, the new rewritten edate or ddate became 14736, instead of the correct 14737 from day0 = mdy(05, 07, 00). It was fine when edate or ddate were positive integers. data csp.task3; set csp.task2; day0 = mdy(05, 07, 00); edate = edate + day0; ddate = ddate0 + day0; run; Then, I tried to create placeholder variables to see if the problem can be avoided. data csp.task3;
set csp.task2;
day0 = mdy(05, 07, 00);
edate0 = edate + day0;
ddate0 = ddate + day0;
edate = edate0;
ddate = ddate0;
format edate ddate day0 date9.;
run; And I also tried this: data csp.task3;
set csp.task2;
day0 = mdy(05, 07, 00);
edate0 = intnx('day', day0, edate);
ddate0 = intnx('day', day0, ddate);
edate = edate0;
ddate = ddate0;
format edate ddate day0 date9.;
run; Well, the problem persists in an even more bizarre way: edate ddate edate0 ddate0 1 14736 14736 14737 14737 2 14736 14738 14737 14738 I simply assigned edate0 to edate and ddate0 to ddate, and still managed to get the wrong values. I did some experiments with simple numeric values and couldn't reproduce the same error. Maybe it has to do with the special date class and some memory address problem?
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