entity_generic-8.x-3.x-dev/src/Generic/EntityCreatedTrait.php

<?php

namespace Drupal\entity_generic\Generic;

/**
 * Implements created functionality.
 */
trait EntityCreatedTrait {

  /**
   * {@inheritdoc}
   */
  public function getCreatedTime() {
    $key = $this->getEntityType()->getKey('created');

    return $this->get($key)->value;
  }

  /**
   * {@inheritdoc}
   */
  public function setCreatedTime($timestamp) {
    $key = $this->getEntityType()->getKey('created');
    $this->set($key, $timestamp);

    return $this;
  }

}