Override Recent Comments Widget Output from WordPress Widget

/* START Override Recent Comments Widget Output from WordPress Widget */
class WP_Widget_Recent_Comments_Custom extends WP_Widget_Recent_Comments {
    function widget( $args, $instance ) {
        static $first_instance = true;

        if ( ! isset( $args['widget_id'] ) ) {
            $args['widget_id'] = $this->id;
        }

        $output = '';

        $default_title = __( 'Recent Comments' );
        $title         = ( ! empty( $instance['title'] ) ) ? $instance['title'] : $default_title;

        /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
        $title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

        $number = ( ! empty( $instance['number'] ) ) ? absint( $instance['number'] ) : 5;
        if ( ! $number ) {
            $number = 5;
        }

        $comments = get_comments(
            /**
             * Filters the arguments for the Recent Comments widget.
             *
             * @since 3.4.0
             * @since 4.9.0 Added the `$instance` parameter.
             *
             * @see WP_Comment_Query::query() for information on accepted arguments.
             *
             * @param array $comment_args An array of arguments used to retrieve the recent comments.
             * @param array $instance     Array of settings for the current widget.
             */
            apply_filters(
                'widget_comments_args',
                array(
                    'number'      => $number,
                    'status'      => 'approve',
                    'post_status' => 'publish',
                ),
                $instance
            )
        );

        $output .= $args['before_widget'];
        if ( $title ) {
            $output .= $args['before_title'] . $title . $args['after_title'];
        }

        $recent_comments_id = ( $first_instance ) ? 'recentcomments' : "recentcomments-{$this->number}";
        $first_instance     = false;

        $format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';

        /** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */
        $format = apply_filters( 'navigation_widgets_format', $format );

        if ( 'html5' === $format ) {
            // The title may be filtered: Strip out HTML and make sure the aria-label is never empty.
            $title      = trim( strip_tags( $title ) );
            $aria_label = $title ? $title : $default_title;
            $output    .= '<nav role="navigation" aria-label="' . esc_attr( $aria_label ) . '">';
        }

        $output .= '<ul id="' . esc_attr( $recent_comments_id ) . '">';
        if ( is_array( $comments ) && $comments ) {
            // Prime cache for associated posts. (Prime post term cache if we need it for permalinks.)
            $post_ids = array_unique( wp_list_pluck( $comments, 'comment_post_ID' ) );
            _prime_post_caches( $post_ids, strpos( get_option( 'permalink_structure' ), '%category%' ), false );

            foreach ( (array) $comments as $comment ) {
                // var_dump($comment->comment_date);
                $output .= '<li class="recentcomments">';
                $output .= sprintf(
                    /* translators: Comments widget. 1: Comment author, 2: Post link. */
                    _x( '%1$s on %2$s', 'widgets' ),
                    '<span class="comment-author-link">' . get_comment_author_link( $comment ) . '</span>',
                    '<a href="' . esc_url( get_comment_link( $comment ) ) . '">' . get_the_title( $comment->comment_post_ID ) . '</a>'
                );
                /* END CUSTOM || Show Date */
                $output .= '<br>';
                $output .= $comment->comment_date;
                /* END CUSTOM || Show Date */
                $output .= '</li>';
            }
        }
        $output .= '</ul>';

        if ( 'html5' === $format ) {
            $output .= '</nav>';
        }

        $output .= $args['after_widget'];

        echo $output;
    }
}

add_action( 'widgets_init', 'register_custom_recent_comments' );
function register_custom_recent_comments() {
     register_widget( 'WP_Widget_Recent_Comments_Custom' );
}
/* END Override Recent Comments Widget Output from WordPress Widget */