Drupal’s Twitter Pull module is a useful one: not just for its own UI elements, but also for getting tweets to format yourself. However, in a recent version change, it lost its $tweet->time_ago property on the tweet objects.
You can recreate this straightforwardly using the following PHP:
<?php $tweet->time_ago = format_interval(time() - $t->timestamp);
It’s a minor pain but if you’ve exposed your own theme implementations to preprocess hooks - and why wouldn’t you? - then it should be easy to put in e.g. your template.php.
