The way validators are in 2.18.4 you need to do it like this:

class IS_MEMBERSHIP_YEAR_END(Validator)
:
    def __init__(self, error_message='Not a membership year end'):
        self.error_message = error_message

    def validate(self, value):
        yearend = datetime.date(2018,9,30)
        if value.month==yearend.month and value.day==yearend.day:
            return value
        else:
            raise ValidationError(self.translator(self.error_message))

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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