>>> 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
>>>