Add date & time to Recent Comment Widget

Hi Friends,

First of all thank you for the great support your deliver.
I would like to extend my current default “Recent Comment Widget” with a date and time. Is that possible?

wp-includes/default-widgets.php

/**
		 * Filter the arguments for the Recent Comments widget.
		 *
		 * @since 3.4.0
		 *
		 * @see get_comments()
		 *
		 * @param array $comment_args An array of arguments used to retrieve the recent comments.
		 */
		$comments = get_comments( apply_filters( 'widget_comments_args', array(
			'number'      => $number,
			'status'      => 'approve',
			'post_status' => 'publish'
		) ) );

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

		$output .= '<ul id="recentcomments">';
		if ( $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) {
				$output .= '<li class="recentcomments">';
				/* translators: comments widget: 1: comment author, 2: post link */
				$output .= sprintf( _x( '%1$s on %2$s', 'widgets' ),
					'<span class="comment-author-link">' . get_comment_author_link() . '</span>',
					'<a href="' . esc_url( get_comment_link( $comment->comment_ID ) ) . '">' . get_the_title( $comment->comment_post_ID ) . '</a>'
				);
				$output .= '</li>';
			}
		}
		$output .= '</ul>';
		$output .= $args['after_widget'];

		echo $output;

		if ( ! $this->is_preview() ) {
			$cache[ $args['widget_id'] ] = $output;
			wp_cache_set( 'widget_recent_comments', $cache, 'widget' );
		}
	}

	public function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['number'] = absint( $new_instance['number'] );
		$this->flush_widget_cache();

		$alloptions = wp_cache_get( 'alloptions', 'options' );
		if ( isset($alloptions['widget_recent_comments']) )
			delete_option('widget_recent_comments');

		return $instance;
	}

	public function form( $instance ) {
		$title  = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
		$number = isset( $instance['number'] ) ? absint( $instance['number'] ) : 5;
?>
		<p><label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
		<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo $title; ?>" /></p>

		<p><label for="<?php echo $this->get_field_id( 'number' ); ?>"><?php _e( 'Number of comments to show:' ); ?></label>
		<input id="<?php echo $this->get_field_id( 'number' ); ?>" name="<?php echo $this->get_field_name( 'number' ); ?>" type="text" value="<?php echo $number; ?>" size="3" /></p>

<?php
	}
}