Having the post updated date instead of the original post date

Hey everyone, get_post_time is used to display the original posting date in an RSS feed, is there a similar something I can use to display the date which the post was last updated instead of when it was originally posted?

The line I am currently using is this: <?php echo mysql2date(‘M d Y’, get_post_time(‘Y-m-d’, true), false); ?></title>

and it displays the original posting date regardless of how I update it