instruction: what was patient 029-8212's first operation time since 2 years ago?
response: SELECT treatment.treatmenttime FROM treatment WHERE treatment.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '029-8212')) AND DATETIME(treatment.treatmenttime) >= DATETIME(CURRENT_TIME(), '-2 year') ORDER BY treatment.treatmenttime LIMIT 1