<?php
$timelimit=1 * 86400; //days * seconds per day
$post_age = date(\'U\') - get_post_time(\'U\');
if ($post_age < $timelimit) {
echo \'this post is within my time limits \'; //DO SOMETHING
}
?>

根据您希望帖子显示的位置，解决方案会有所不同。如果要筛选主主页，此解决方案将执行以下操作：

/**
 * Conditionally add a posts_where filter based on the current query
 *
 * @param object $query
 * @return void
 */
function wpse_53599_24h_pre_get_posts( $query ) {
    if ( is_admin() || ! $query->is_main_query() || ! $query->is_home() )
        return;

    add_filter( \'posts_where\', \'wpse_53599_filter_last_24h\' );
}
add_action( \'pre_get_posts\', \'wpse_53599_24h_pre_get_posts\' );

/**
 * Add a clause to posts_where to restrict posts to the last 24h
 *
 * @param string $where
 * @return string
 */
function wpse_53599_filter_last_24h( $where = \'\' ) {
    $where .= " AND post_date >= \'" . date( \'Y-m-d H:i:s\', time() - DAY_IN_SECONDS ) . "\'";
    remove_filter( \'posts_where\', \'wpse_53599_filter_last_24h\' );
    return $where;
}

如果要筛选主主主查询以外的查询，只需在pre_get_posts 作用

如果要筛选子查询，则只需添加posts_where 在实例化WP\\U查询之前进行筛选，然后立即将其删除，并跳过pre_get_posts 一点