Knp\Bundle\TimeBundle\DateTimeFormatter::doGetDiffMessage PHP Method

    protected function doGetDiffMessage($count, $invert, $unit)
    {
        $id = sprintf('diff.%s.%s', $invert ? 'ago' : 'in', $unit);
        return $this->translator->transChoice($id, $count, array('%count%' => $count), 'time');
    }