when did patient 21110 for the first time this year be admitted via the emergency room admit into the hospital?
select admissions.admittime from admissions where admissions.subject_id = 21110 and admissions.admission_location = 'emergency room admit' and datetime(admissions.admittime,'start of year') = datetime(current_time,'start of year','-0 year') order by admissions.admittime asc limit 1