instruction: when was the first time that patient 006-62367 was diagnosed with a leukocytosis?
response: SELECT diagnosis.diagnosistime FROM diagnosis WHERE diagnosis.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '006-62367')) AND diagnosis.diagnosisname = 'leukocytosis' ORDER BY diagnosis.diagnosistime LIMIT 1