protected function initMinutes( $minutes, $seconds )
   {

      if ( ! TypeTool::IsDecimal( $minutes ) )
      {
         throw new GISError(
            GISError::ERROR_TYPE_MINUTES,
            \sprintf( "'%s' is not of required decimal number format.", $minutes )
         );
      }

      $this->extractTime( $minutes, $seconds );

   }