您可以这样做：

if ( have_posts() ) :
    /* Queue the first post, that way we know
     * which date we\'re dealing with.
     *
     * We reset this later so we can run the loop
     * properly with a call to rewind_posts().
     */
    the_post();

    // receive the latest post timestamp
    $latest_post_timestamp = strtotime( get_post()->post_date );

    /* Since we called the_post() above, we need to
     * rewind the loop back to the beginning that way
     * we can run the loop properly, in full.
     */
    rewind_posts();

    // create our custom query and set our latest date arguments
    $the_query = new WP_Query( array(
        \'year\' => date( \'Y\', $latest_post_timestamp ),
        \'monthnum\' => date( \'m\', $latest_post_timestamp ),
        \'day\' => date( \'d\', $latest_post_timestamp ),
    ) );

    // render our latest date posts
    echo \'<ul>\';
    while ( $the_query->have_posts() ) :
        $the_query->the_post();
        echo \'<li>\' . get_the_title() . \'</li>\';
    endwhile;
    echo \'</ul>\';

    // Restore original query and post data
    wp_reset_query();
    wp_reset_postdata();
endif;