when did patient 16572 get an intake, the first time until 1872 days ago?
select inputevents_cv.charttime from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 16572 ) ) and datetime(inputevents_cv.charttime) <= datetime(current_time,'-1872 day') order by inputevents_cv.charttime asc limit 1