what was patient 12726's first time of taking .9% normal saline today?
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 = 12726 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = '.9% normal saline' and d_items.linksto = 'inputevents_cv' ) and datetime(inputevents_cv.charttime,'start of day') = datetime(current_time,'start of day','-0 day') order by inputevents_cv.charttime asc limit 1