PHP DateTime class Namespace

I'm use the symfony2 framework and I want to use the PHP's DateTime class (PHP version is 5.3).
Here the statement:
namespace SDCU\GeneralBundle\Entity;

class Country
{
   public function __construct(){
       $this->insertedAt = new DateTime();
   }
}

But, when execute this constructor, I get an error saying that there's no "SDCU\GeneralBundle\Entity\DateTime" class. I've been searching around for DateTime's namespace but with no success... any idea?

 Answer:

DateTime is in the global namespace, and as "classnames always resolve to the current namespace name" you have to use \DateTime.

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