class SelectDateWidget

    @property
    def is_hidden(self):
        return self.input_type == 'hidden' if hasattr(self, 'input_type') else False

    def _media(self):
        # Get the media property of the superclass, if it exists
        sup_cls = super(cls, self)
        try:
            base = sup_cls.media
        except AttributeError:
            base = Media()

        # Get the media definition for this class
        definition = getattr(cls, 'Media', None)
        if definition:
            extend = getattr(definition, 'extend', True)
            if extend:
                if extend is True:
                    m = base
                else:
                    m = Media()
                    for medium in extend:
                        m = m + base[medium]
                return m + Media(definition)
            return Media(definition)
        return base

    def _media(self):
        # Get the media property of the superclass, if it exists
        sup_cls = super(cls, self)
        try:
            base = sup_cls.media
        except AttributeError:
            base = Media()

        # Get the media definition for this class
        definition = getattr(cls, 'Media', None)
        if definition:
            extend = getattr(definition, 'extend', True)
            if extend:
                if extend is True:
                    m = base
                else:
                    m = Media()
                    for medium in extend:
                        m = m + base[medium]
                return m + Media(definition)
            return Media(definition)
        return base

    def format_value(self, value):
        """
        Return a dict containing the year, month, and day of the current value.
        Use dict instead of a datetime to allow invalid dates such as February
        31 to display correctly.
        """
        year, month, day = None, None, None
        if isinstance(value, (datetime.date, datetime.datetime)):
            year, month, day = value.year, value.month, value.day
        elif isinstance(value, str):
            match = self.date_re.match(value)
            if match:
                # Convert any zeros in the date to empty strings to match the
                # empty option value.
                year, month, day = [int(val) or '' for val in match.groups()]
            elif settings.USE_L10N:
                input_format = get_format('DATE_INPUT_FORMATS')[0]
                try:
                    d = datetime.datetime.strptime(value, input_format)
                except ValueError:
                    pass
                else:
                    year, month, day = d.year, d.month, d.day
        return {'year': year, 'month': month, 'day': day}

    def format_value(self, value):
        """
        Return a value as it should appear when rendered in a template.
        """
        if value == '' or value is None:
            return None
        if self.is_localized:
            return formats.localize_input(value)
        return str(value)

    def get_context(self, name, value, attrs):
        context = super().get_context(name, value, attrs)
        date_context = {}
        year_choices = [(i, str(i)) for i in self.years]
        if not self.is_required:
            year_choices.insert(0, self.year_none_value)
        year_name = self.year_field % name
        date_context['year'] = self.select_widget(attrs, choices=year_choices).get_context(
            name=year_name,
            value=context['widget']['value']['year'],
            attrs={**context['widget']['attrs'], 'id': 'id_%s' % year_name},
        )
        month_choices = list(self.months.items())
        if not self.is_required:
            month_choices.insert(0, self.month_none_value)
        month_name = self.month_field % name
        date_context['month'] = self.select_widget(attrs, choices=month_choices).get_context(
            name=month_name,
            value=context['widget']['value']['month'],
            attrs={**context['widget']['attrs'], 'id': 'id_%s' % month_name},
        )
        day_choices = [(i, i) for i in range(1, 32)]
        if not self.is_required:
            day_choices.insert(0, self.day_none_value)
        day_name = self.day_field % name
        date_context['day'] = self.select_widget(attrs, choices=day_choices,).get_context(
            name=day_name,
            value=context['widget']['value']['day'],
            attrs={**context['widget']['attrs'], 'id': 'id_%s' % day_name},
        )
        subwidgets = []
        for field in self._parse_date_fmt():
            subwidgets.append(date_context[field]['widget'])
        context['widget']['subwidgets'] = subwidgets
        return context

    def get_context(self, name, value, attrs):
        context = {}
        context['widget'] = {
            'name': name,
            'is_hidden': self.is_hidden,
            'required': self.is_required,
            'value': self.format_value(value),
            'attrs': self.build_attrs(self.attrs, attrs),
            'template_name': self.template_name,
        }
        return context

    def id_for_label(self, id_):
        for first_select in self._parse_date_fmt():
            return '%s_%s' % (id_, first_select)
        return '%s_month' % id_

    def id_for_label(self, id_):
        """
        Return the HTML ID attribute of this Widget for use by a <label>,
        given the ID of the field. Return None if no ID is available.

        This hook is necessary because some widgets have multiple HTML
        elements and, thus, multiple IDs. In that case, this method should
        return an ID value that corresponds to the first ID in the widget's
        tags.
        """
        return id_

    def value_from_datadict(self, data, files, name):
        y = data.get(self.year_field % name)
        m = data.get(self.month_field % name)
        d = data.get(self.day_field % name)
        if y == m == d == '':
            return None
        if y is not None and m is not None and d is not None:
            input_format = get_format('DATE_INPUT_FORMATS')[0]
            try:
                date_value = datetime.date(int(y), int(m), int(d))
            except ValueError:
                # Return pseudo-ISO dates with zeros for any unselected values,
                # e.g. '2017-0-23'.
                return '%s-%s-%s' % (y or 0, m or 0, d or 0)
            date_value = datetime_safe.new_date(date_value)
            return date_value.strftime(input_format)
        return data.get(name)

    def value_from_datadict(self, data, files, name):
        """
        Given a dictionary of data and this widget's name, return the value
        of this widget or None if it's not provided.
        """
        return data.get(name)

    def value_omitted_from_data(self, data, files, name):
        return not any(
            ('{}_{}'.format(name, interval) in data)
            for interval in ('year', 'month', 'day')
        )

    def value_omitted_from_data(self, data, files, name):
        return name not in data