what was the first hospital admission time in which patient 93104 was admitted last year via the emergency room admit?
select admissions.admittime from admissions where admissions.subject_id = 93104 and admissions.admission_location = 'emergency room admit' and datetime(admissions.admittime,'start of year') = datetime(current_time,'start of year','-1 year') order by admissions.admittime asc limit 1