instruction: what was the last procedure time patient 26817 has had since 2 years ago?
response: SELECT procedures_icd.charttime FROM procedures_icd WHERE procedures_icd.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 26817) AND DATETIME(procedures_icd.charttime) >= DATETIME(CURRENT_TIME(), '-2 year') ORDER BY procedures_icd.charttime DESC LIMIT 1