when was the first time that patient 31300 had gastric meds intake on 02/26/2103?
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 = 31300 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'gastric meds' and d_items.linksto = 'inputevents_cv' ) and strftime('%y-%m-%d',inputevents_cv.charttime) = '2103-02-26' order by inputevents_cv.charttime asc limit 1