code: protected function init(Map $fields)
      {
          parent::init($fields);
          $this->year  = $fields->get(self::$YEAR);
          $this->month = $fields->get(self::$MONTH);
          $this->date  = $fields->get(self::$DATE);
      }
docs: (non-PHPdoc)
  @see AbstractTime::init
  @ignore