if ( $author == 'no' && $date == 'no' ) {
    return;
}

$post_author = the_author_posts_link();
// add compatibility when used in header before loop
if ( empty( $post_author ) ) {
    global $post;
    $post_author = get_the_author_meta( 'display_name', $post->post_author );
}
$u_modified_time = get_the_modified_time(‘U’);
$post_date = date_i18n( get_option( 'date_format' ), strtotime( get_the_date('r') ) );
$u_time = get_the_time('U');
$u_modified_time = get_the_modified_time('U');
$updated_date = get_the_modified_time('F jS, Y');

echo '<div class="post-byline">';
if ($u_modified_time >= $u_time + 120) {
// translators: %1$s = the author who published the post. %2$s = the date it was modified
printf( esc_html_x( 'By %1$s | Last Updated on %3$s', 'This blog post was published by some author on some date ', 'mission-news' ), esc_html( $post_author ), esc_html( $post_date ), esc_html( $updated_date )) ;}
    echo '</div>';
}

<div class="post-byline">
<a href="localhost/root/author" title="Posts by author" rel="author">Author</a>
By  | Last Updated on December 13th, 2018
</div>