code: public function setCreated($time)
      {
          if ($time === null) {
              $time = time();
          } elseif (is_string($time)) {
              if (is_numeric($time)) {
                  $time = (int) $time;
              } else {
                  $time = strtotime($time);
              }
          }
  
          $this->created = $time;
  
          return $this;
      }
docs: Set Created.
  
  @param int|string $time
  
  @return Properties