value="${fe:date(data.lastAccessTime)}"
                                                                pattern="yyyy-MM-dd'T'HH:mm:ss"/></td>
                                                    </tr>
                                                </c:forEach>
                                                </tbody>

    protected boolean isValidDateFormat(final String date) {
        if (date == null || date.isEmpty()) {
            return true; // Date is optional
        }
        // Basic validation for W3C Datetime format (YYYY-MM-DD or YYYY-MM-DDThh:mm:ss+00:00)
        // This is a simplified validation
        if (date.length() < 10) {
            if (logger.isDebugEnabled()) {
                logger.debug("Invalid date format (too short): {}", date);

        if (format.contains("epoch_millis")) {
            return Long.toString(date.getTime());
        } else if (format.contains("date_optional_time")) {
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
            return sdf.format(date);
        } else {
            return Long.toString(date.getTime());
        }
    }

 * so you can specify multiple options using method chaining.
 * </p>
 *
 * <pre>
 * copyBeanToBean(srcBean, destBean, excludeNull().dateConverter("date", "MM/dd"));
 * </pre>
 *
 * @author koichik
 */
public abstract class CopyOptionsUtil {

    /**
     * Do not instantiate.
     */
    protected CopyOptionsUtil() {
    }

    /**

     */
    private String loc;

    /**
     * The date of last modification of the file. This date should be in W3C
     * Datetime format. This format allows you to omit the time portion, if
     * desired, and use YYYY-MM-DD.
     *
     * Note that this tag is separate from the If-Modified-Since (304) header
     * the server can return, and search engines may use the information from
     * both sources differently.
     */

                                                    </td>
                                                    <td>${f:h(data.size)}</td>
                                                    <td>${fe:formatDate(data.lastModified, 'yyyy-MM-dd HH:mm:ss')}</td>
                                                </c:if>
                                                <c:if test="${data.directory.booleanValue()}">

    /** Default datetime format pattern without timezone. */
    public static final String DEFAULT_DATETIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss";

    /** ISO datetime format pattern with milliseconds and UTC timezone. */
    public static final String ISO_DATETIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

    /** Date optional time format identifier. */
    public static final String DATE_OPTIONAL_TIME = "date_optional_time";

*----+------+------+
| <<<build.timestamp>>>\
<<<maven.build.timestamp>>> | the UTC timestamp of build start, in <<<yyyy-MM-dd'T'HH:mm:ss'Z'>>> default format, which can be overridden with <<<maven.build.timestamp.format>>> POM property | <<<$\{maven.build.timestamp\}>>> |
*----+------+------+

        if (format.contains("epoch_millis")) {
            return Long.toString(date.getTime());
        } else if (format.contains("date_optional_time")) {
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
            return sdf.format(date);
        } else {
            return Long.toString(date.getTime());
        }
    }

        if (format.contains("epoch_millis")) {
            return Long.toString(date.getTime());
        } else if (format.contains("date_optional_time")) {
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
            return sdf.format(date);
        } else {
            return Long.toString(date.getTime());
        }
    }