how to set date field programmatically drupal 8 / 9

Example how to set date field programmatically drupal 8 / 9

function mymodule_entity_presave(EntityInterface $entity)
{
    if ($entity->getEntityTypeId() == 'node') {
           $dateTime = \DateTime::createFromFormat('Y-m-d',date('Y-m-d', time()));
           $publicationDate = $dateTime->format('Y-m-d');
           $entity->set('field_publication_date', $publicationDate);
    }
}

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