when was the last time when patient 65582 had the maximum value of calculated total co2 since 08/2104?
select labevents.charttime from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 65582 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'calculated total co2' ) and strftime('%y-%m',labevents.charttime) >= '2104-08' order by labevents.valuenum desc, labevents.charttime desc limit 1