Hi,

Please try add more this code to the end of functions.php file:

/**
 * Add hatom data
 *
 * @since 1.2.1
 */
if ( ! function_exists( 'penci_add_suf_hatom_data' ) && ( ( function_exists( 'is_penci_amp' ) && ! is_penci_amp() ) || ! function_exists( 'is_penci_amp' ) ) ) {
 function penci_add_suf_hatom_data( $content ) {
 $t      = get_the_modified_time( 'F jS, Y' );
 $author = get_the_author();
 $title  = get_the_title();
 if ( ( is_home() || is_singular() || is_archive() ) && ! get_theme_mod( 'penci_remove_hatom_data' ) ) {
 $content .= '<div class="hatom-extra" style="display:none !important;visibility:hidden;"><span class="entry-title">' . $title . '</span> was last modified: <span class="updated"> ' . $t . '</span> by <span class="author vcard"><span class="fn">' . $author . '</span></span></div>';
 }
return $content;
 }
add_filter( 'the_content', 'penci_add_suf_hatom_data' );
}
/**
 * Remove suf hatom data in call function the_excerpt
 *
 * @since 1.2.3
 */
if ( ! function_exists( 'penci_remove_excerpt_suf_hatom_data' ) ) {
 function penci_remove_excerpt_suf_hatom_data( $excerpt ) {
 $t      = get_the_modified_time( 'F jS, Y' );
 $author = get_the_author();
 $title  = get_the_title();
$replace = $title . ' was last modified: ' . $t . ' by ' . $author;
 return str_replace( $replace, '', $excerpt );
 }
add_filter( 'wp_trim_excerpt', 'penci_remove_excerpt_suf_hatom_data' );
}

like on this image.

Hope this help,

Best Regards,

PenciDesign