11-24-2016 06:23 PM - edited 11-24-2016 06:24 PM
None of the above, though I suppose it depends on the question which you have not provided. It helps...
Easiest way to answer this question is to run the code.
options yearcutoff=1920; data test; datea='01jan19'd; dateb='01jan20'd; year=dateb-datea; format datea dateb date9.; run; proc print data=test; run;
And the output:
Obs datea dateb year 1 01JAN2019 01JAN1920 -36160