from datetime import datetime print(datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S.%f')[:-3])
from datetime import datetime dt_obj = datetime.strptime('20.12.2016 09:38:42,76', '%d.%m.%Y %H:%M:%S,%f') millisec = dt_obj.timestamp() * 1000 print(millisec)