DateTime use sample into symfony2 with Doctrine

AnyRepository.php

<?php

//... some code

  public function findByFieldIntoInterval(\DateTime $earlyDate, \DateTime $lateDate)
  {
    $qb = $this->createQueryBuilder('e');
    
    $qb->where($qb->expr()->between('e.field', ':earlyDate', ':lateDate'));
    
    $qb->setParameter('earlyDate', $earlyDate, \Doctrine\DBAL\Types\Type::DATETIME);
    $qb->setParameter('lateDate', $lateDate, \Doctrine\DBAL\Types\Type::DATETIME);
    
    return $qb->getQuery()->getResult();
  }

// ... some code