@Override
    public final Chronology withZone(DateTimeZone zone) {
        if (zone.equals(DateTimeZone.UTC)) return this.withUTC();
        throw new UnsupportedOperationException("Not supported yet.");
    }
@Override
    public final Chronology withZone(DateTimeZone zone) {
        if (zone.equals(DateTimeZone.UTC)) return this.withUTC();
        throw new UnsupportedOperationException("Not supported yet.");
    }
@ Override public final Chronology withZone ( DateTimeZone zone ) { if ( zone . equals ( DateTimeZone . UTC ) ) return this . withUTC ( ) ; throw new UnsupportedOperationException ( "Not supported yet." ) ; }
Throws UnsupportedOperationException unless the time zone is UTC
Throws UnsupportedOperationException unless the time zone is UTC