MSM_Sitemap_Builder_Cron::generate_sitemap_for_year_month PHP Method

    public static function generate_sitemap_for_year_month($args)
    {
        $is_partial_or_running = get_option('msm_days_to_process');
        $year = $args['year'];
        $month = $args['month'];
        // cal_days_in_month doesn't exist on WP.com so set it to a possible max. Will skip invalid dates as no posts will be found
        if (!function_exists('cal_days_in_month')) {
            $max_days = 31;
        } else {
            $max_days = cal_days_in_month(CAL_GREGORIAN, (int) $month, (int) $year);
        }
        if (date('Y') == $year && $month == date('n')) {
            $max_days = date('j');
        }
        if (empty($is_partial_or_running)) {
            $days = range(1, $max_days);
            update_option('msm_days_to_process', $days);
        } else {
            $days = $is_partial_or_running;
        }
        $next_day = end($days);
        $time = time();
        wp_schedule_single_event($time, 'msm_cron_generate_sitemap_for_year_month_day', array(array('year' => (int) $year, 'month' => (int) $month, 'day' => (int) $next_day)));
    }