what was the first procedure time patient 31880 went through in 2104?
select procedures_icd.charttime from procedures_icd where procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 31880 ) and strftime('%y',procedures_icd.charttime) = '2104' order by procedures_icd.charttime asc limit 1