info can be supplied in one of two ways.
     *
     * The first is to provide a relative_range_id which is converted into start, end, and label.
     *
     * The second is to provide explicit start and end fields which will be used as is.
     *
     * @return Date_Range
     */
    private function get_date_range() : Date_Range
    {
        $relative_range_id = $this->get_field('relative_range_id');
        $exact_start = $this->get_field('exact_start');
        $exact_end = $this->get_field('exact_end');
        if (!\is_null($exact_start) && !\is_null($exact_end)) {
            try {
                $start = new DateTime($exact_start, Timezone::site_timezone());
                $end = new DateTime($exact_end, Timezone::site_timezone());
                return new Exact_Date_Range($start, $end);
            } catch (Throwable $e) {
                // Do nothing and fall back to default relative date range
            }
        }
        return new Relative_Date_Range($relative_range_id);
    }
}