when did patient 92788 get a immunology (cmv) microbiology test last time in 12/this year?
select microbiologyevents.charttime from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 92788 ) and microbiologyevents.spec_type_desc = 'immunology (cmv)' and datetime(microbiologyevents.charttime,'start of year') = datetime(current_time,'start of year','-0 year') and strftime('%m',microbiologyevents.charttime) = '12' order by microbiologyevents.charttime desc limit 1