when did patient 90663 receive the first prescription in 12/this year for zolpidem tartrate?
select prescriptions.startdate from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 90663 ) and prescriptions.drug = 'zolpidem tartrate' and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-0 year') and strftime('%m',prescriptions.startdate) = '12' order by prescriptions.startdate asc limit 1