code: public function get($key)
      {
          if (!($time = $this->driver->get($key))) {
              if ($key == self::LAST_UPDATE_KEY) {
                  $time = $this->reset();
              } else {
                  $time = $this->get(self::LAST_UPDATE_KEY);
              }
          }
  
          return $time;
      }
docs: Get time for key.
  
  @param string $key
  
  @return \DateTime