when is the first procedure time of patient 12797 in 2102?
select procedures_icd.charttime from procedures_icd where procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 12797 ) and strftime('%y',procedures_icd.charttime) = '2102' order by procedures_icd.charttime asc limit 1