what time did patient 92846 get his last urine out foley output on this month/20?
select outputevents.charttime from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 92846 ) ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'urine out foley' and d_items.linksto = 'outputevents' ) and datetime(outputevents.charttime,'start of month') = datetime(current_time,'start of month','-0 month') and strftime('%d',outputevents.charttime) = '20' order by outputevents.charttime desc limit 1