when was the first lab test patient 55624 has received until 02/2100?
select labevents.charttime from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 55624 ) and strftime('%y-%m',labevents.charttime) <= '2100-02' order by labevents.charttime asc limit 1