# normalized method

String normalized()

Returns a normalized version of the zone ID.

This is useful for unifying equivalent representations like 'GMT', 'Z', and 'UTC' into a standard 'UTC' string. It performs basic normalization only.

Example:

    ZoneId gmt = ZoneId.of('GMT');
    print(gmt.normalized()); // UTC

## Implementation

    String normalized() {
      switch (_id.toUpperCase()) {
        case 'GMT':
        case 'UTC':
        case 'Z':
          return 'UTC';
        default:
          return _id;
      }
    }