what was the first time until 29 months ago patient 30235 received a bilirubin, total lab test?
select labevents.charttime from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'bilirubin, total' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 30235 ) and datetime(labevents.charttime) <= datetime(current_time,'-29 month') order by labevents.charttime asc limit 1