when was patient 2498 last given an intake on 08/28/2104?
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 = 2498 ) ) and strftime('%y-%m-%d',inputevents_cv.charttime) = '2104-08-28' order by inputevents_cv.charttime desc limit 1