我从@moraleida获得了答案所提供的代码，并对其进行了改进，以便它可以查看发布日期，而不是服务器日期。

我还对其进行了修改，以便它可以查找该帖子每月和每天的所有帖子，并链接到它们，只要它不是显示在上面的同一个帖子ID。毕竟，既然你已经阅读了2012年1月31日的帖子，就不需要链接到自己。例如，2012年的帖子应该显示2011年的链接，2011年的帖子应该显示2012年的链接。如果你每天发布超过一次，这也是有益的。它将在当天显示这两个帖子，即使是同一年发布的。

我把它变成了一个可以变成函数的函数。php。要在模板中显示此内容，请使用<?php on_this_day(); ?> 在模板文件中。

function on_this_day(){
$on_this_day = array(
    // Build the array using post date, and omit the year
    \'monthnum\' => get_the_date(\'n\'),
    \'day\' => get_the_date(\'j\')
);

add_filter( \'posts_where\', \'filter_where\' );
$query = new WP_Query( $on_this_day );
remove_filter( \'posts_where\', \'filter_where\' );

    if( $query->have_posts() ) {
        // Uncomment this next line to echo an On this day prefix to the years.
        // echo "On this day in ";
        $postYear = get_the_date(\'Y\');

        while ($query->have_posts()) {
            $query->the_post();
            $year = get_the_time(\'Y\'); 
            $queryYear = get_the_date(\'Y\');
            $month = get_the_time(\'m\'); 
            $day = get_the_time(\'d\');  
            if ($queryYear == $postYear) { 
                // I use permalinks to link to. If you\'d rather link to the day archive list, use get_day_link($year, $month, $day) instead of get_permalink.
                // This line compares the query year to the post year. If it\'s the same year, then add "Also from" so that it doesn\'t look like a duplicate link. 
                echo \'<a class="on-this-day" href="\'.get_permalink($query->ID).\'" title="On this day in \'.$year.\' - \'.get_the_title().\'">Also from \'.$year.\' - \'.get_the_title().\'</a><br> \';
            } else {
                echo \'<a class="on-this-day" href="\'.get_permalink($query->ID).\'" title="On this day in \'.$year.\' - \'.get_the_title().\'">\'.$year.\' - \'.get_the_title().\'</a><br> \';
            }
        } 
    // Reset post data so it displays the original post. 
    wp_reset_postdata();    
     } else {
     // No posts to show
     echo "No Historical Posts On This Day";
    }
}


// Create a new filtering function that will add our where clause to the query
function filter_where( $where = \'\' ) {
    // Posts for all years before the current post date.
    //$where .= " AND post_date < \'" . get_the_date(\'Y-m-d\') . "\'";
    // Filter on post ID instead
    $where .= " AND ID <> \'" . get_the_ID() . "\'";
    return $where;
}