Human: datetime start date and end date of that month. Assistant: 
Here is a Python program to datetime start date and end date of that month

import datetime

def get_date(start_date, end_date):
    """Gets a datetime start date and end date of that month.

    If start_date is not set, returns None.

    If end_date is not set, returns None.
    """
    if start_date is None:
        return None
    if end_date is None:
        return None
    return (start_date, end_date)

# Enter the start date
start_date = datetime.datetime(2019, 1, 1)

# Enter the end date
end_date = datetime.datetime(2019, 1, 31)

# Calling the function
print((get_date(start_date, end_date)))

#Example Output
# (datetime.datetime(2019, 1, 1, 0, 0), datetime.datetime(2019, 1, 31, 0, 0))

#Remember to inspect code for bugs.