我们在wordpress上发布了一些按日期排序的活动。所有这些都很好，除非我们参加2020年的活动，它会排在列表的顶部而不是底部。日期保存在数据库中为“2020年1月24日”

2019年的所有活动都按天、然后按月进行了正确排序，下一次将在列表顶部显示。

下面是查询的代码。我不确定这是问题所在的查询、数据库还是两者兼而有之。感谢您的帮助或建议。

if( $data[\'items_per_page\'] ) {
                        $event_perpage = $data[\'items_per_page\'];
                    }
                    else {
                        $event_perpage = \'10\';
                    }

                    $paged = (get_query_var(\'paged\')) ? get_query_var(\'paged\') : 1;

                    $args = array(
                        \'post_type\' => \'event\',
                        \'posts_per_page\' => $event_perpage,
                        \'paged\' => $paged,
                        \'meta_key\' => $prefix.\'event_date\',
                        \'orderby\' => \'meta_value\',
                        \'order\' => \'ASC\'
                    );

                    $wp_query = new WP_Query($args);

                    if($wp_query->have_posts()) :
                        while($wp_query->have_posts()) :
                            $wp_query->the_post(); ?>

                        <?php

                            // Get event date
                            $e_date = get_post_meta($post->ID, $prefix.\'event_date\', true);
                            $e_date_end = get_post_meta($post->ID, $prefix.\'event_date_end\', true);
                            if ( $e_date !== \'\' ) {
                                $event_date_string = $e_date;
                                $event_year = mysql2date( \'Y\', $event_date_string );
                                $event_monthM = mysql2date( \'M\', $event_date_string );
                                $event_day = mysql2date( \'d\', $event_date_string );
                                $event_month = apply_filters(\'get_the_date\', $event_monthM, \'M\');
                            }
                            // If no date set
                            else {

                                $event_month = "No Date";
                                $event_day = "00";
                                $event_year = \'\';

                            }

                            if ( $e_date_end !== \'\' ) {
                                $event_date_end_string = $e_date_end;
                                $event_year_end = mysql2date( \'Y\', $event_date_end_string );
                                $event_monthM_end = mysql2date( \'M\', $event_date_end_string );
                                $event_day_end = mysql2date( \'d\', $event_date_end_string );
                                $event_month_end = apply_filters(\'get_the_date\', $event_monthM_end, \'M\');
                            }

                            // Get event time
                            $e_time = get_post_meta($post->ID, $prefix.\'event_time\', true);
                            if ( $e_time !== \'\' ) { $event_time = $e_time; }
                            else { $event_time = __(\'No time set\',\'qns\'); }

                            // Get event location
                            $e_location = get_post_meta($post->ID, $prefix.\'event_location\', true);
                            if ( $e_location !== \'\' ) { $event_location = $e_location; }
                            else { $event_location = __(\'No location set\',\'qns\'); }