when was the last time that patient 19981 was given a hemoglobin lab test in 02/last year?
select labevents.charttime from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'hemoglobin' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 19981 ) and datetime(labevents.charttime,'start of year') = datetime(current_time,'start of year','-1 year') and strftime('%m',labevents.charttime) = '02' order by labevents.charttime desc limit 1