这是我起草的一些代码。它可能没有使用最佳实践，甚至事实上也不起作用，因为我没有测试过它，但理论上它应该起作用。：）

<?php
/**
 * Retrieve the closest post from a set time from today.
 * 
 * @param  integer $daysago the number of days 
 * @return integer the ID of the post from long ago
 **/

function wpse38126_filterfoward($where = \'\', $daysago) { $where .= " AND post_date > \'" . date(\'Y-m-d\', strtotime(\'-\' . $daysago . \' days\')) . "\'"; return $where; }
function wpse38126_filterbackward($where = \'\', $daysago) { $where .= " AND post_date >= \'" . date(\'Y-m-d\', strtotime(\'-\' . $daysago*2 . \' days\')) . "\'" . " AND post_date <= \'" . date(\'Y-m-d\', strtotime(\'-\'.$daysago.\' days\')) . "\'"; }
function wpse38126_limits($limits) { return 1; }
function wpse38126_postfromlongago( $daysago = \'\') {
    $month = date(\'n\', strtotime(\'-\' . $daysago . \' days\'));
    $day   = date(\'j\', strtotime(\'-\' . $daysago . \' days\'));
    $year  = date(\'Y\', strtotime(\'-\' . $daysago . \' days\'));
    $query = new WP_Query(array(
        \'month\' => $month,
        \'day\' => $day,
        \'year\' => $year ));
    if($query->have_posts()) { while($query->have_posts()) { $query->the_post();
        return $post->ID;
    } } else {
        add_filter( \'posts_where\', \'wpse38126_filterfoward\' );
        add_filter( \'post_limits\', \'wpse38126_limits\' );
        $fowardintime = new WP_Query( $query_string . \'&order=ASC&orderby=date\' );
        remove_filter( \'posts_where\', \'filtwpse38126_filterfowarder\' );
        remove_filter( \'post_limits\', \'wpse38126_limits\' );

        add_filter( \'posts_where\', \'wpse38126_filterbackward\' );
        add_filter( \'post_limits\', \'wpse38126_limits\' );
        $backwardintime = new WP_Query( $query_string );
        remove_filter( \'posts_where\', \'wpse38126_filterbackward\' );
        remove_filter( \'post_limits\', \'wpse38126_limits\' );

        // set up posts
        if($fowardintime->have_posts) { while($fowardintime->have_posts()) { $fowardintime->the_post();
            $fowardintime_id = $post->ID; $fowardintime_date = get_the_date( \'Y/m/d g:i:s A\' );
        }
        if($backwardintime->have_posts) { while($backwardintime->have_posts()) { $backwardintime->the_post();
            $backwardintime_id = $post->ID; $backwardintime_date = get_the_date( \'Y/m/d g:i:s A\' );
        }

        // do some complicated logical comparisons
        if($fowardintime_id && !$backwardintime_id) {
            return $fowardintime_id;
        } elseif ($backwardintime_id && !$fowardintime_id) {
            return $backwardintime_id;
        } else {
            $foward = strtotime($fowardintime_date) - strtotime(\'-\' . $daysago . \' days\');
            $backward = strtotime(\'-\' . $daysago . \' days\') - strtotime($backwardintime_date);

            if ($foward < $backward) {
                return $fowardintime_id;
            } else {
                return $backwardintime_id;
            }
        }
    }
}
?>

<?php $post_id = wpse38126_postfromlongago(365); ?>
<a href="<?php echo get_permalink( $post_id ); ?>">My link to a post or page</a>