In the theme directory edit image.php

Locate the following line…

<span><abbr title="<?php the_time('Y-m-d\TH:i:sO') ?>"><?php the_time('j M') ?></abbr></span>

to

<span><abbr title="<?php echo date('Y-m-d\TH:i:sO', $imgmeta['image_meta']['created_timestamp']) ?>"><?php echo date('j M', $imgmeta['image_meta']['created_timestamp']) ?></abbr></span>

Here’s the link on getsatisfaction.com/fthrwght/ that pointed me in the right direction.