Got rid of the unsupported operand type(s) for -: 'datetime.datetime' and 'str' but still som crumb error.
Changed the lookup method in cache.py

    def lookup(self, strategy):
        if self.dummy:
            return None
        if self.initialised == -1:
            self.initialise()
        if self.initialised == 0:  # failure
            return None
        try:
            data = _CookieSchema.get(_CookieSchema.strategy == strategy)
            cookie = _pkl.loads(data.cookie_bytes)
            if isinstance(data.fetch_date, _datetime.datetime):
                fetch_date = data.fetch_date
            else:
                # Try parsing the date string using the two supported formats
                try:
                    fetch_date = _datetime.datetime.strptime(data.fetch_date, "%Y-%m-%d %H:%M:%S.%f")
                except ValueError:
                    fetch_date = _datetime.datetime.strptime(data.fetch_date, "%Y-%m-%dT%H:%M:%S.%f")
            return {'cookie': cookie, 'age': _datetime.datetime.now() - fetch_date}
        except _CookieSchema.DoesNotExist:
            return None

I run into the same problem today with yahoofinancials 1.20 installed from pypi.

I patched cache.py as follows, and then it was working as expected.

`
yahoofinancials/cache.py

373c373
return {'cookie': cookie, 'age': _datetime.datetime.now() - data.fetch_date}
return {'cookie': cookie, 'age': (_datetime.datetime.now() - _datetime.datetime.fromisoformat(data.fetch_date)).isoformat()}

`

Yes your update works as expected and a bit less code :). Thanks for the update.

@bjosun @Meborl Would one of you be willing to make a PR with this change?

I am also facing this recent issue and thankful for @Meborl and @bjosun for spending time to resolve it. Thank you guys.
I temporarily solved it reverting from 1.20 to version 1.18 (the issue exists in 1.19 also).

I run into the same problem today with yahoofinancials 1.20 installed from pypi.

I patched cache.py as follows, and then it was working as expected.

` yahoofinancials/cache.py

373c373 return {'cookie': cookie, 'age': _datetime.datetime.now() - data.fetch_date} return {'cookie': cookie, 'age': (_datetime.datetime.now() - _datetime.datetime.fromisoformat(data.fetch_date)).isoformat()}

`

Work for me too! Thanks
Patched cache.py line 362 as follow:
return {'cookie':cookie, 'age':(_datetime.datetime.now()-
_datetime.datetime.fromisoformat(
data.fetch_date))}