$qb = $this->getEntityManager()->createQueryBuilder();

        $qb->select( 'e' )
            ->from( 'EntityEvent',  'e' )
            ->setMaxResults( $limit )
            ->setFirstResult( $offset )
            ->orderBy('e.dateStart', 'ASC');

        $events = $qb->getQuery()->getResult();

/**
 * User
 *
 * @ORMTable(name="event")
 * @ORMEntity(repositoryClass="RepositoriesEventRepository")
 */
class Event
{
    /**
     * @var DateTime
     *
     * @ORMColumn(name="date_start", type="datetime", precision=0, scale=0, nullable=true, unique=false)
     */
    private $dateStart;

...
}

$qb->select( 'e' )
        ->from( 'EntityEvent',  'e' )
        ->Where(
            $qb->expr()->andX(
                $qb->expr()->between('e.dateStart', ':from', ':to')
            )
        )
        ->orderBy('e.dateStart', 'ASC')
        ->setFirstResult( $offset )
        ->setMaxResults( $limit );

$qb->select( 'e' )
        ->from( 'EntityEvent',  'e' )
        ->orderBy('e.dateStart', 'ASC');
        ->setFirstResult( $offset )
        ->setMaxResults(20);