how to get published date from blogger using Zend and PHP?

hi
I'm using an early version of Zend framework, and can get most things 
related to my blogs
e.g.
$entry = $this->gdClient->getEntry($query);
global $blogTitle, $blogContent;
$blogTitle = $entry->title->text;
$blogContent = $entry->getContent()->text;

but I can't figure out how to get the published date of each blog?

$blogPublished = $entry->published->text;
- doesn't work

neither does 
$blogPublished = $entry->published;

Any ideas?

thanks

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