date_convert_and_check

import datetime
from typing import List
from typing import Tuple
# just for type checking and bit of
# documentation, but it's optional


def convert_date(date: str, formats: List[str]) -> datetime.date:
    """
    Convert the date-string with the provided formats and return a date object.
    If the provided date-string does not fit to any formats or if
    the provided date-string has wrong values, the function raises a ValueError

    Method: https://docs.python.org/3.8/library/datetime.html#datetime.datetime.strptime
    Format: https://docs.python.org/3.8/library/datetime.html#strftime-strptime-behavior
    """
    for dt_format in formats:
        try:
            """
            parse the date from provided date with dt_format
            and create a date object from datetime object.
            """
            date = datetime.datetime.strptime(date, dt_format).date()
        except ValueError:
            """
            ValueError occours if the provided format was wrong or
            if the values itself are not valid.
            """
            pass
        else:
            """
            If no error happens, we know that the format fits and the values
            are in range. Return the created date object
            """
            return date
    """
    If the for loop has been finished, we know that all iterations
    throw an ValueError. So this date is wrong or
    the provided formats are wrong or the date itself was invalid.
    """
    raise ValueError(f'Invalid date: {date}')

# the second format is isoformat (iso8601)
# date and datetime do have the method fromisoformat()
# and isoformat()
date_formats: Tuple[str] = ('%d/%m/%Y', '%Y-%m-%d')

dates = '30/02/2000, 29/02/2000, 30/02/2100, 29/02/2100, 31/02/2004, 30/02/2004, 29/02/2004, 18/03/2014, 24/08/2011, 06/10/2019, 23/09/2015, 11/01/2019, 12/09/2013, 14/03/2012, 07/03/2015, 26/12/2014, 28/07/2010, 11/07/2013, 22/11/2011, 30/10/2015, 28/12/2016, 25/10/2016, 31/12/2016, 29/01/2019, 20/03/2011, 26/11/2019, 24/08/2015'

for date in map(str.strip, dates.split(',')):
    try:
        date_obj: datetime.date = convert_date(date, date_formats)
    except ValueError as error:
        print(error)
    else:
        print(date_obj)




#  >> Invalid date: 30/02/2000
#  >> 2000-02-29
#  >> Invalid date: 30/02/2100
#  >> Invalid date: 29/02/2100
#  >> Invalid date: 31/02/2004
#  >> Invalid date: 30/02/2004
#  >> 2004-02-29
#  >> 2014-03-18
#  >> 2011-08-24
#  >> 2019-10-06
#  >> 2015-09-23
#  >> 2019-01-11
#  >> 2013-09-12
#  >> 2012-03-14
#  >> 2015-03-07
#  >> 2014-12-26
#  >> 2010-07-28
#  >> 2013-07-11
#  >> 2011-11-22
#  >> 2015-10-30
#  >> 2016-12-28
#  >> 2016-10-25
#  >> 2016-12-31
#  >> 2019-01-29
#  >> 2011-03-20
#  >> 2019-11-26
#  >> 2015-08-24