can't compare datetime.datetime to builtin_function_or_method

Question

I am new in Django.

I created Sponsor model that model has start_date (start date become sponsor) and end_date (end date of sponsor).

start_date = models.DateField(
        _("Start date"),
        default=datetime.date.today)

end_date = models.DateField(
        _("End date"),
        default=datetime.date.today)

I want to put all logic inside the model, if that not possible then I want to put the logic in a view. I make method current_sponsor which can return True or False (if today is on a range of start_date and end_date means True else False).

This is my current_sponsor method

def current_sponsor(self):
        today = datetime.date.today
        if today >= self.start_date:
            return True
        elif today <= self.end_date:
            return True
        else:
            return False

The problem is I got error can't compare datetime.datetime to builtin_function_or_method.

I've tried to see the data using django shell it seem works but the reality does not work.

@rischan No offense, but it would _really_ benefit you to start actually reading the exception messages... They couldn't be any clearer, but if they're not a simple search will make it so; these errors you got have been asked a million times. — Agustín Lado, Nov 04 '15 at 15:43

score 6 · Accepted Answer · edited Nov 04 '15 at 13:57

6

datetime.date.today is not calling the function you think it is:

>>> import datetime
>>> datetime.date.today
<built-in method today of type object at 0x7fb681a90f80>  # NOT CALLING FUNCTION

>>> datetime.date.today()  # You need () at the end
datetime.date(2015, 11, 4)

If you add the parentheses, you'll get the result you expect.

edited Nov 04 '15 at 13:57

jonrsharpe

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answered Nov 04 '15 at 13:55

TayTay

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Thanks @jonrshape Now I realized that I miss parentheses, but when I put parentheses I am still get error `can't compare datetime.datetime to datetime.date`. – rischan Nov 04 '15 at 14:29
1

As the exception says, one of the dates you're comparing is a `datetime.datetime` object and one is a `datetime.date` object. See [this answer](http://stackoverflow.com/questions/7239315/cant-compare-datetime-datetime-to-datetime-date). – TayTay Nov 04 '15 at 14:33
I changed everything to `today = datetime.datetime.today()` and now I get different error `can't compare offset-naive and offset-aware datetimes ` – rischan Nov 04 '15 at 14:55
@rischan this is a Django "feature." I'm going to assume you're using Django 1.4... check [this link](http://stackoverflow.com/questions/10652819/django-1-4-cant-compare-offset-naive-and-offset-aware-datetimes) which discusses your exact issue. – TayTay Nov 04 '15 at 14:58
2

Thanks Tgsmith61591 it because of utc. I've replace it with `replace(tzinfo=utc):` and it works. – rischan Nov 04 '15 at 15:00

can't compare datetime.datetime to builtin_function_or_method

1 Answers1