function

function twentytwelve_entry_meta() {
    $categories_list = get_the_category_list( __( ', ', 'twentytwelve' ) );

    $date = sprintf( '<a href="%1$s" title="%2$s" rel="bookmark"><time class="entry-date" datetime="%3$s">%4$s</time></a>',
        esc_url( get_permalink() ),
        esc_attr( get_the_time() ),
        esc_attr( get_the_date( 'c' ) ),
        esc_html( get_the_date() )
    );

    $author = sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s" rel="author">%3$s</a></span>',
        esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
        esc_attr( sprintf( __( 'View all posts by %s', 'twentytwelve' ), get_the_author() ) ),
        get_the_author()
    );

if ( is_single() && $categories_list ) {
        $utility_text = __( 'This entry was posted in %1$s on %2$s<span class="by-author"> by %3$s</span>.', 'twentytwelve' );
    } else {
        $utility_text = __( 'This entry was posted on %2$s<span class="by-author"> by %3$s</span>.', 'twentytwelve' );
    }

    printf(
        $utility_text,
        $categories_list,
        $date,
        $author
    );
}