您可以编写自己的函数（将其添加到functions.php 文件：

function get_posts_count_from_last_24h($post_type =\'post\') {
    global $wpdb;

    $numposts = $wpdb->get_var(
        $wpdb->prepare(
            "SELECT COUNT(ID) ".
            "FROM {$wpdb->posts} ".
            "WHERE ".
                "post_status=\'publish\' ".
                "AND post_type= %s ".
                "AND post_date> %s",
            $post_type, date(\'Y-m-d H:i:s\', strtotime(\'-24 hours\'))
        )
    );
    return $numposts;
}

function get_posts_count_from_today($post_type =\'post\') {
    global $wpdb;

    $numposts = $wpdb->get_var(
        $wpdb->prepare(
            "SELECT COUNT(ID) ".
            "FROM {$wpdb->posts} ".
            "WHERE post_status=\'publish\' ".
                "AND post_type= %s ".
                "AND DATE_FORMAT(post_date, \'%Y-%m-%d\') = %s",
            $post_type, date(\'Y-m-d\', time())
        )
    );
    return $numposts;
}

<?php echo get_posts_count_from_last_24h(); ?>
<?php echo get_posts_count_from_today(); ?>