The database fix only works once (in my case).
A solution which worked for me was to work at the following line:
Go to your FTP-Server => root/app/code/core/Mage/GoogleShopping/Model/Service/Item.php on line 64
And change this:
$published = $this->convertContentDateToTimestamp($entry->getPublished()->getText());
$published = date();
Let me know if it works for you.
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