How to differentiate between a dateutil parsed date and a datetime with 0 for all time values - python-3.x

Question

As far as I can tell there is no way to distinguish the difference between these two date strings ('2020-10-07', '2020-10-07T00:00:00') once they are parsed by dateutil. I really would like to be able to tell the difference between a standalone date and a date with a timestamp of zero.
import dateutil.parser
import datetime
date_str = '2020-10-07'
time_str = '2020-10-07T00:00:00'
s = dateutil.parser.parse(date_str)
e = dateutil.parser.parse(time_str)
The ultimate goal is to set the time to the beginning of the day in the end of the day when it is a standalone date but leave the date alone when there is a time included. Get close with something like this but it still can't differentiate from this one case. If do you know of any good solution to this that would be really helpful.
if s == e and s.time() == datetime.time.min:
e = datetime.datetime.combine(e, datetime.time.max)
Post is somewhat useful but it's outdated and I'm not even sure that it would work for my use case. Finding if a python datetime has no time information

Answer 1

Here's a function which uses a simple try/except to test if the input can be parsed to a date (i.e. has no time information) or a datetime object (i.e. has time information). If the input format is different from ISO format, you could also implement specific strptime directives.
from datetime import date, time, datetime
def hasTime(s):
"""
Parameters
----------
s : string
ISO 8601 formatted date / datetime string.
Returns
-------
tuple, (bool, datetime.datetime).
boolean will be True if input specifies a time, otherwise False.
"""
try:
return False, datetime.combine(date.fromisoformat(t), time.min)
except ValueError:
return True, datetime.fromisoformat(t)
# do nothing else here; will raise an error if input can't be parsed
for t in ('2020-10-07', '2020-10-07T00:00:00', 'not-a-date'):
print(t, hasTime(t))
# output:
# >>> 2020-10-07 (False, datetime.datetime(2020, 10, 7, 0, 0))
# >>> 2020-10-07T00:00:00 (True, datetime.datetime(2020, 10, 7, 0, 0))
# >>> ValueError: Invalid isoformat string: 'not-a-date'