instruction: when was the first time patient 028-56914 was prescribed solu-medrol and acetaminophen until 04/2102 at the same time?
response: SELECT t1.drugstarttime FROM (SELECT patient.uniquepid, medication.drugstarttime FROM medication JOIN patient ON medication.patientunitstayid = patient.patientunitstayid WHERE medication.drugname = 'solu-medrol' AND patient.uniquepid = '028-56914' AND STRFTIME('%y-%m', medication.drugstarttime) <= '2102-04') AS t1 JOIN (SELECT patient.uniquepid, medication.drugstarttime FROM medication JOIN patient ON medication.patientunitstayid = patient.patientunitstayid WHERE medication.drugname = 'acetaminophen' AND patient.uniquepid = '028-56914' AND STRFTIME('%y-%m', medication.drugstarttime) <= '2102-04') AS t2 ON t1.uniquepid = t2.uniquepid WHERE DATETIME(t1.drugstarttime) = DATETIME(t2.drugstarttime) ORDER BY t1.drugstarttime LIMIT 1