function in Django behaves differently - python-3.x

Question

I have a function named localtime(ltz, /) to calculate users' local time. Outside of Django it works, but I get localtime takes 0 positional arguments but 1 was given error inside of Django.
Here's the function
UTILITY.PY
def localtime(ltz, /):
utc_now = datetime.datetime.now(tz=pytz.UTC)
return utc_now.astimezone(pytz.timezone(ltz))
VIEWS.PY
....
qs = Users.objects.filter(id=self.request.user).values()
for val in qs:
local_time = localtime(val['time_zone'])
print(local_time)
....
Traceback (most recent call last):
File "../env/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "../env/lib/python3.8/site-packages/django/core/handlers/base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "../env/lib/python3.8/site-packages/django/views/generic/base.py", line 73, in view
return self.dispatch(request, *args, **kwargs)
File "../env/lib/python3.8/site-packages/django/utils/decorators.py", line 43, in _wrapper
return bound_method(*args, **kwargs)
File "../env/lib/python3.8/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
return view_func(request, *args, **kwargs)
File "../env/lib/python3.8/site-packages/django/views/generic/base.py", line 101, in dispatch
return handler(request, *args, **kwargs)
File "../env/lib/python3.8/site-packages/django/views/generic/edit.py", line 172, in post
return super().post(request, *args, **kwargs)
File "../env/lib/python3.8/site-packages/django/views/generic/edit.py", line 142, in post
return self.form_valid(form)
File "../users/views.py", line 148, in form_valid
local_tz = localtime(val['time_zone'])
Exception Type: TypeError at /timesheet/
Exception Value: localtime() takes 0 positional arguments but 1 was given
Can anyone help figure out why I'm getting localtime takes 0 positional arguments but 1 was given error in Django? Thank you in advance.