index = pd.date_range(start='2020-8-15', end = '2021-8-11', freq='M')
print(index)
>>>DatetimeIndex(['2020-08-31', '2020-09-30', '2020-10-31', '2020-11-30',
'2020-12-31', '2021-01-31', '2021-02-28', '2021-03-31',
'2021-04-30', '2021-05-31', '2021-06-30', '2021-07-31'],
dtype='datetime64[ns]', freq='M')