sanitized post meta

if ( ! function_exists( 'responsive_post_meta_data' ) ) :
/**
 * This function prints post meta data.
 */
function responsive_post_meta_data() {
    printf( __( '<span class="%1$s">Posted on </span>%2$s<span class="%3$s"> by </span>%4$s', 'responsive' ),
    'meta-prep meta-prep-author posted',
    sprintf( '<a href="%1$s" title="%2$s" rel="bookmark"><span class="timestamp">%3$s</span></a>',
        esc_url( get_permalink() ),
        esc_attr( get_the_time() ),
        esc_html( get_the_date() )
    ),
    'byline',
    sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s">%3$s</a></span>',
        esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
        esc_attr( sprintf( __( 'View all posts by %s', 'responsive' ), get_the_author() ) ),
        esc_html( get_the_author() )
        )
    );
}
endif;