when is the first time patient 90165 had the minimum value of white blood cells until 08/2101?
select labevents.charttime from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 90165 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'white blood cells' ) and strftime('%y-%m',labevents.charttime) <= '2101-08' order by labevents.valuenum asc, labevents.charttime asc limit 1