I'd like to change the formatting of a date in Symfony 1.4

The default one being:

<?php echo $question->getUpdatedAt(); 
// Returns 2010-01-26 16:23:53
?>

I'd like my date to be formatted like so: 26/01/2010 - 16h23

I tried using the format_date helper DateHelper class.

Unfortunately the API is rather empty (something really needs to be done about it.)

Browsing the helper's source code, I found that a second argument, format, can be passed.

I assumed it was using the same syntax as PHP's date function. But here's what it outputs (same example as above):

<?php sfContext::getInstance()->getConfiguration()->loadHelpers('Date');
// [...]
 echo format_date($question->getUpdatedAt(),'d/m/y - H\hi')
// Returns 26/23/2010 - 16\4i

I'm sure I'm not the first one having trouble doing this but I've been Googling around and nothing accurate showed up.

Do you guys have any idea how to format a date in Symfony 1.4?