static void validateTimestampFormat(ReadableConfig tableOptions) {
        String timestampFormat = tableOptions.get(TIMESTAMP_FORMAT);
        if (!TIMESTAMP_FORMAT_ENUM.contains(timestampFormat)) {
            throw new ValidationException(
                    String.format(
                            "Unsupported value '%s' for %s. Supported values are [SQL, ISO-8601].",
                            timestampFormat, TIMESTAMP_FORMAT.key()));
        }
    }
Validates timestamp format which value should be SQL or ISO-8601.
inlong-sort/sort-formats/format-common/src/main/java/org/apache/inlong/sort/formats/base/TextFormatOptionsUtil.java