HI team,

There is a strange behavior when we use get_timeseries method with start_date > end_date, It raise an AttributeError and not a ValueError. This happens since you raise seems to raise the ValueError inside a context manager as following (your code in eikon.time_series.py):

Since str has no attribute __enter__, you can't raise that expected ValueError.

To reproduce the issue (eikon version 1.1.14):

import eikon as ek
import datetime

date_format = "%Y%m%d"
start_date = datetime.datetime.strptime("20220415", date_format)
end_date = datetime.datetime.strptime("20220414", date_format)
 
ek.set_app_key(API_KEY)
result = self.connection.get_timeseries(
                rics=["IBM"],
                fields=["OPEN", "CLOSE"],
                start_date=start_date,
                end_date=end_date,
                raw_output=True,
                normalize=True,
                debug=True,
            )

Thanks