Converting a timestamp to PHP date format for a field in a node template

I have an imagefield, 'event_image' and printing all possible variables for the field tells me I have timestamp as a possible variable of the image to render. I use: print '<pre>'; var_dump(get_defined_vars()); print '</pre> // renders: ["timestamp"]=> string(10) "1348629688" ... in node--mycustom.tpl.php to get the variables. Now I can render the timestamp as such: <?php print $node->field_event_image['und'][0]['timestamp'] ?>   ... and it prints a UNIX formatted timestamp as: 1348629688 I'd like to convert this to a PHP date format. So I am guessing I would need to convert the UNIX timestamp somehow using the PHP gmdate function. Typically I would use something like this for raw php: $mytimestamp=1348629688; print gmdate("m-d-Y", $mytimestamp); Which would take my timestamp and output: 09-26-2012 ... but I just don't know how to do within the context of my drupal 7 field and the node template.