when was the first time in which patient 19412 had the maximum arterial bp [diastolic] today?
select chartevents.charttime from chartevents where chartevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 19412 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'arterial bp [diastolic]' and d_items.linksto = 'chartevents' ) and datetime(chartevents.charttime,'start of day') = datetime(current_time,'start of day','-0 day') order by chartevents.valuenum desc, chartevents.charttime asc limit 1