time stratified cox regression

[lillymaginta1]

I am running a proc phreg statement modeling outcome with time with only one variable in the model. Since the time variable span from 0-24 months, would it be possible to adjust the statement below to get the HR at different time points e.g. (6 m, or 12 m)?

proc phreg data=;
   class drug (ref='1') / param=ref;
   model period*outcome(0)= drug  / risklimits;
run;

[PGStats]

I'm not an expert in survival analysis but, from the doc, the BASELINE statement with the TIMELIST option might be what you need.