SnapshotVersion sv2 =
                addSnapshotVersion(source.getVersioning(), "jar", after, "1.0-" + formatDate(after, true) + "-2", 2);
        SnapshotVersion sv3 =
                addSnapshotVersion(source.getVersioning(), "pom", after, "1.0-" + formatDate(after, true) + "-2", 2);
        assertTrue(target.merge(source));
        Versioning actualVersioning = target.getVersioning();

        .Builder()
        .addHeader("Last-Modified: " + formatDate(-1, TimeUnit.HOURS))
        .addHeader("Expires: " + formatDate(1, TimeUnit.HOURS))
        .body("ABC")
        .build(),
    )
    server.enqueue(
      MockResponse
        .Builder()
        .addHeader("Last-Modified: " + formatDate(-5, TimeUnit.MINUTES))
        .addHeader("Expires: " + formatDate(2, TimeUnit.HOURS))
        .body("DEF")
        .build(),

          headersOf(
            "Last-Modified",
            formatDate(-1, TimeUnit.HOURS)!!,
            "Expires",
            formatDate(1, TimeUnit.HOURS)!!,
          ),
        body = "ABC.1",
      ),
    )
    server.enqueue(
      MockResponse(
        headers =
          headersOf(
            "Last-Modified",
            formatDate(-1, TimeUnit.HOURS)!!,
            "Expires",

    </example>
  </function>

  <function>
    <description>
      Returns formatted date from a given value.
    </description>
    <name>formatDate</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.String formatDate(java.time.ZonedDateTime, java.lang.String)</function-signature>
    <example>
      ${fe:formatDate(d, 'yyyy')}
    </example>
  </function>

     *
     * @param date the date to format
     * @return formatted date string, or empty string if date is null
     */
    public static String formatDate(final Date date) {
        if (date == null) {
            return StringUtil.EMPTY;
        }
        final SimpleDateFormat sdf = new SimpleDateFormat(Constants.ISO_DATETIME_FORMAT);

        assertEquals("2004-04-01T12:34:56.123Z", FessFunctions.formatDate(date));

        date = FessFunctions.parseDate("2004-04-01T12:34:56Z");
        assertEquals("2004-04-01T12:34:56.000Z", FessFunctions.formatDate(date));

        date = FessFunctions.parseDate("2004-04-01T12:34Z");
        assertEquals("2004-04-01T12:34:00.000Z", FessFunctions.formatDate(date));

        date = FessFunctions.parseDate("2004-04-01");

                final Map<String, String> params = new LinkedHashMap<>();
                params.put("User Info ID", e.getId());
                params.put("Created Time", FessFunctions.formatDate(e.getCreatedAt()));
                params.put("Updated Time", FessFunctions.formatDate(e.getUpdatedAt()));
                return params;
            }).get();
        }
        if (SearchLogPager.LOG_TYPE_CLICK.equalsIgnoreCase(logType)) {

     */
    protected StringBuilder appendTimestamp(final StringBuilder buf) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        append(buf, "timestamp", () -> FessFunctions.formatDate(systemHelper.getCurrentTime()));
        return buf;
    }

    /**
     * Appends exception information to the buffer.
     *
     * @param buf the string buffer to append to

                    throw new InvalidAccessTokenException("invalid_token",
                            "The token is expired(" + FessFunctions.formatDate(FessFunctions.date(expiredTime)) + ").");
                }
                stream(accessToken.getPermissions()).of(stream -> stream.forEach(permissionSet::add));

        final StringBuilder buf = new StringBuilder(1000);
        buf.append("url:").append(getUrl(keyObj));
        buf.append('\t');
        buf.append("time:").append(FessFunctions.formatDate(new Date(time)));
        return buf;
    }

    /**
     * Extracts the URL string from a crawler object for logging purposes.
     *
     * @param keyObj the crawler object to extract URL from