}

    /**
     * Sets the export format.
     *
     * @param format the format name (e.g. "html", "json")
     * @return this instance for method chaining
     */
    public IndexExportJob format(final String format) {
        this.formatter = createFormatter(format);
        return this;
    }

    /**
     * Creates a formatter for the given format name.
     *
     * @param format the format name

     * @param format the date format pattern or "pdf_date" for PDF date format
     * @return parsed Date object, or null if parsing fails
     */
    public static Date parseDate(final String value, final String format) {
        if (value == null) {
            return null;
        }

        try {
            if (PDF_DATE.equals(format)) {
                final Calendar cal = DateConverter.toCalendar(value);

        }
    }

    // --- format() fluent API tests ---

    @Test
    public void test_format_returnsThis() {
        final IndexExportJob result = indexExportJob.format("html");
        assertSame(indexExportJob, result);
    }

    @Test
    public void test_format_unsupportedFormat() {
        try {
            indexExportJob.format("xml");

 */
public interface IndexExportFormatter {

    /**
     * Returns the file extension for this format (e.g. ".html", ".json").
     *
     * @return the file extension including the leading dot
     */
    String getFileExtension();

    /**
     * Returns the default index file name for this format (e.g. "index.html", "index.json").
     *
     * @return the index file name
     */
    String getIndexFileName();

        // Verify the string format
        assertNotNull(result);
        assertTrue(result.contains("FessUserTimeZoneProcessProvider"));
        assertTrue(result.contains("useTimeZoneHandling=false"));
        assertTrue(result.contains("acceptCookieTimeZone=false"));
        assertTrue(result.contains("@"));

        // Verify that hashCode is included in hex format

  --type=data
```

**Step 2: Convert to Fess Format**

Transform documents to include Fess required fields. Example transformation script:

```python
import json

with open('documents.json', 'r') as infile, \
     open('fess-documents.json', 'w') as outfile:
    for line in infile:
        doc = json.loads(line)

        # Transform to Fess format
        fess_doc = {

      "content_length": {
        "type": "long"
      },
      "created": {
        "type": "date",
        "format": "date_optional_time"
      },
      "timestamp": {
        "type": "date",
        "format": "date_optional_time"
      },
      "expires": {
        "type": "date",
        "format": "date_optional_time"
      },
      "digest": {
        "type": "text",
        "index": false
      },

        return cal;
    }

    /**
     * Adds a new interval rule to the rule list.
     *
     * @param from the start time in HH:MM format
     * @param to the end time in HH:MM format
     * @param days comma-separated list of days (1=Sunday, 7=Saturday)
     * @param delay the delay in milliseconds to apply during this interval
     */

      "content_length": {
        "type": "long"
      },
      "created": {
        "type": "date",
        "format": "date_optional_time"
      },
      "timestamp": {
        "type": "date",
        "format": "date_optional_time"
      },
      "expires": {
        "type": "date",
        "format": "date_optional_time"
      },
      "digest": {
        "type": "text",
        "index": false
      },

            assertEquals("Invalid time format: 12. Expected format: HH:MM", e.getMessage());
        }

        try {
            IntervalControlHelper.parseTime("12:30:45");
            fail("Should throw FessSystemException");
        } catch (FessSystemException e) {
            assertEquals("Invalid time format: 12:30:45. Expected format: HH:MM", e.getMessage());
        }

        try {