stset date, id(id) failure(_Idate_13==0) scale(1)

                id:  id
     failure event:  _Idate_13 == 0
obs. time interval:  (date[_n-1], date]
exit on or before:  failure

------------------------------------------------------------------------------
    114,715  total observations
         39  observations end on or before enter()
     83,289  observations begin on or after (first) failure
------------------------------------------------------------------------------
     31,387  observations remaining, representing
     31,387  subjects
     31,387  failures in single-failure-per-subject data
    104,570  total analysis time at risk and under observation
                                                at risk from t =         0
                                     earliest observed entry t =         0
                                          last observed exit t =        12

. sts graph, by(dplay) separate plotopts(recast(line))

         failure _d:  _Idate_13 == 0
   analysis time _t:  date
                 id:  id