instruction: when was the last hospital admission that patient 027-130381 was admitted to via the operating room until 4 years ago?
response: SELECT patient.hospitaladmittime FROM patient WHERE patient.uniquepid = '027-130381' AND patient.hospitaladmitsource = 'operating room' AND DATETIME(patient.hospitaladmittime) <= DATETIME(CURRENT_TIME(), '-4 year') ORDER BY patient.hospitaladmittime DESC LIMIT 1