>>> start = datetime.datetime(1850, 1, 1) 
>>> end = datetime.datetime.now() 
>>> ek.get_timeseries(".GDAXI", interval="monthly", start_date=start, end_date=end) 
.GDAXI          HIGH     CLOSE      LOW      OPEN  COUNT 
Date 2019-03-31  11823.29  11526.04  11299.8  11584.24   -1.0
>>>