when has patient 64292 entered the hospital for the first time since 6 years ago via the transfer from hosp/extram?
select admissions.admittime from admissions where admissions.subject_id = 64292 and admissions.admission_location = 'transfer from hosp/extram' and datetime(admissions.admittime) >= datetime(current_time,'-6 year') order by admissions.admittime asc limit 1