How to list most recently added posts?

I can’t find the answer to this. Currently I am listing the most recent posts in my sidebar with this:
`<?php
global $post;
$myposts = get_posts(‘orderby=post_modified&numberposts=5’);
foreach($myposts as $post) :
setup_postdata($post);
?>`
However, I’d like to list the most recently added posts instead, as I am adding posts that are dated a few years back and I’d like them to show in the list, instead of just the ones that are dated the most recent. How can I do that?