how to get blog published data?

Hi
I'm using what I think is an early version of the Zend Gdata framework, to 
get blogs out of Google Blogger using PHP.

It's all working fine, and I can get the title and content ok
e.g. 
$entry = $this->gdClient->getEntry($query);
$blogTitle = $entry->title->text;
$blogContent = $entry->getContent()->text;
etc. 

Butt I can't figure out how to get the published date of the blog. I 
thought it might be something like 

$blogPublished = $entry->published->text;
or
$blogPublished = $entry->published;

but neither of these work.

Can anyone help please?

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