when was the first time for patient 23969 procedure in this year?
select procedures_icd.charttime from procedures_icd where procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 23969 ) and datetime(procedures_icd.charttime,'start of year') = datetime(current_time,'start of year','-0 year') order by procedures_icd.charttime asc limit 1