when did patient 59002 have the last test for microbiology until 10 months ago?
select microbiologyevents.charttime from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 59002 ) and datetime(microbiologyevents.charttime) <= datetime(current_time,'-10 month') order by microbiologyevents.charttime desc limit 1