Get a Panel that is the current data in view. It is not safe to persist
        these objects because internal data might change

def get_current(self, item=None, raw=False, start=None, end=None):
        """
        Get a Panel that is the current data in view. It is not safe to persist
        these objects because internal data might change
        """
        item_indexer = slice(None)
        if item:
            item_indexer = self.items.get_loc(item)

        start_index = self._start_index
        end_index = self._pos

        # get inital date window
        where = slice(start_index, end_index)
        current_dates = self.date_buf[where]

        def convert_datelike_to_long(dt):
            if isinstance(dt, pd.Timestamp):
                return dt.asm8
            if isinstance(dt, datetime.datetime):
                return np.datetime64(dt)
            return dt

        # constrict further by date
        if start:
            start = convert_datelike_to_long(start)
            start_index += current_dates.searchsorted(start)

        if end:
            end = convert_datelike_to_long(end)
            _end = current_dates.searchsorted(end, 'right')
            end_index -= len(current_dates) - _end

        where = slice(start_index, end_index)

        values = self.buffer.values[item_indexer, where, :]
        current_dates = self.date_buf[where]

        if raw:
            # return copy so we can change it without side effects here
            return values.copy()

        major_axis = pd.DatetimeIndex(deepcopy(current_dates), tz='utc')
        if values.ndim == 3:
            return pd.Panel(values, self.items, major_axis, self.minor_axis,
                            dtype=self.dtype)

        elif values.ndim == 2:
            return pd.DataFrame(values, major_axis, self.minor_axis,
                                dtype=self.dtype)