ModelBundle/DataFixtures/MongoDB/DemoContent/AbstractDataGenerator.php
protected function getVersionName(NodeInterface $node)
    {
        $date = new \DateTime("now");

        return $node->getName().'_'. $node->getVersion(). '_'. $date->format("Y-m-d_H:i:s");
    }
protected function getVersionName(NodeInterface $node)
    {
        $date = new \DateTime("now");

        return $node->getName().'_'. $node->getVersion(). '_'. $date->format("Y-m-d_H:i:s");
    }
@param NodeInterface $node

@return string