when was the first time patient 64185 was diagnosed with long-term use anticoagul?
select diagnoses_icd.charttime from diagnoses_icd where diagnoses_icd.icd9_code = ( select d_icd_diagnoses.icd9_code from d_icd_diagnoses where d_icd_diagnoses.short_title = 'long-term use anticoagul' ) and diagnoses_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 64185 ) order by diagnoses_icd.charttime asc limit 1