$ php app/console doctrine:query:dql \'SELECT NOW()\'
[Doctrine\\ORM\\Query\\QueryException] [Syntax Error] line 0, col 7: Error:
CURRENT_TIMESTAMP() uses database timezone, which could lead to weird issues. More simple way - you can use parameter and bind new \DateTime() to it (so you will use php timezone)
It will not work for command line of course, but I suppose that you plan to use it in controller/service/repository/etc..