Backend\Modules\Analytics\Form\DateRangeType::isValid PHP Метод

    private function isValid()
    {
        $fields = $this->form->getFields();
        if (!$fields['start_date']->isFilled(Language::err('FieldIsRequired')) || !$fields['end_date']->isFilled(Language::err('FieldIsRequired'))) {
            return $this->form->isCorrect();
        }
        if (!$fields['start_date']->isValid(Language::err('DateIsInvalid')) || !$fields['end_date']->isValid(Language::err('DateIsInvalid'))) {
            return $this->form->isCorrect();
        }
        $newStartDate = Model::getUTCTimestamp($fields['start_date']);
        $newEndDate = Model::getUTCTimestamp($fields['end_date']);
        // startdate cannot be before 2005 (earliest valid google startdate)
        if ($newStartDate < mktime(0, 0, 0, 1, 1, 2005)) {
            $fields['start_date']->setError(Language::err('DateRangeIsInvalid'));
        }
        // enddate cannot be in the future
        if ($newEndDate > time()) {
            $fields['start_date']->setError(Language::err('DateRangeIsInvalid'));
        }
        // enddate cannot be before the startdate
        if ($newStartDate > $newEndDate) {
            $fields['start_date']->setError(Language::err('DateRangeIsInvalid'));
        }
        return $this->form->isCorrect();
    }