Try using the 'C' modifier to the INTCK function:
data test;
x=INTCK('MONTH','15MAR2018'd,'11MAR2019'd);
y=INTCK('MONTH','15MAR2018'd,'11MAR2019'd,'C');
run;
This will give Y=11 which is the number of whole months between the 2 dates.
Cheers,
Lawrence
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