将活动类添加到自定义post类型日期存档

function create_custom_post_type() {
    register_post_type('event',
        array(
            'labels' => array(
                'name' => __('Events'),
                'singular_name' => __('Event')
            ),
            'public' => true,
            'has_archive' => true,
            'rewrite' => array('slug' => 'events'),
            'supports' => array('title', 'editor', 'thumbnail')
        )
    );
}
add_action('init', 'create_custom_post_type');

<?php get_header(); ?>

<div id="primary" class="content-area">
    <main id="main" class="site-main">

        <?php if (have_posts()) : ?>

            <?php while (have_posts()) : the_post(); ?>

                <article id="post-<?php the_ID(); ?>" <?php post_class('event'); ?>>
                    <header class="entry-header">
                        <h2 class="entry-title"><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
                        <div class="entry-meta">
                            <?php printf(__('Posted on %s', 'textdomain'), get_the_date()); ?>
                        </div><!-- .entry-meta -->
                    </header><!-- .entry-header -->

                    <div class="entry-content">
                        <?php the_excerpt(); ?>
                    </div><!-- .entry-content -->
                </article><!-- #post-<?php the_ID(); ?> -->

            <?php endwhile; ?>

        <?php else : ?>

            <?php get_template_part('template-parts/content', 'none'); ?>

        <?php endif; ?>

    </main><!-- #main -->
</div><!-- #primary -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

.event {
    background-color: #f0f0f0;
    border-left: 4px solid #0073aa;
    padding-left: 10px;
}