private static void visitZoneXToken(int repetitions, JQueryDateTimePatternBuilder builder) {
        switch (repetitions) {
            case 1:
            case 2:
                builder.appendTimezoneByProvidedTimezoneList();
                break;
            default: // 3+
                builder.appendTimezoneIso8601();
                break;
        }
    }
Time zone 'X', 'XX', and 'XXX' token.
primefaces/src/main/java/org/primefaces/convert/CombinedDateTimePatternTokenVisitor.java