您可以查询当前查看年份之前发表的单个帖子。按日期降序（默认）排序时，第一个结果将来自最近一年的帖子。

$current_year = get_query_var( \'year\' );

$previous_posts = get_posts( array(
    \'numberposts\' => 1,
    \'date_query\'  => array(
        \'year\'    => $current_year,
        \'compare\' => \'<\',
    ),
) );

if ( ! empty( $previous_posts ) ) {
    $previous_year = get_the_time( \'Y\', $previous_posts[0] );
}

$next_posts = get_posts( array(
    \'numberposts\' => 1,
    \'order\'       => \'ASC\',
    \'date_query\'  => array(
        \'year\'    => $current_year,
        \'compare\' => \'>\',
    ),
) );

if ( ! empty( $next_posts ) ) {
    $next_year = get_the_time( \'Y\', $next_posts[0] );
}