SQLSRV PDO doesn't support DateTime as a PHP Object

    /**
     * @orm:Column(name="deleteAt", type="datetime")
     */
    protected $deletedAt;

    /**
     * Get DeletedAt
     * @return	\DateTime	
     */
    public function getDeletedAt() {
    	return $this->deletedAt;
    }
    
    /**
     * Set DeletedAt
     * @param	\DateTime		$deletedAt
     */
    public function setDeletedAt(\DateTime $deletedAt) {
        $this->deletedAt = $deletedAt;
    }

$this->setDeletedAt(new \DateTime());

SQLSTATE[22007]: [Microsoft][SQL Server Native Client 10.0][SQL Server]Conversion failed when converting date and/or time from character string.