Bug 146709 Dates still do not work from main report to sub reports...
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/ParameterValidationUtil.java
* <td width="84%">
	 * <ul>
	 * <li>General Date</li>
	 * <li>Long Date</li>
	 * <li>Medium Date</li>
	 * <li>Short Date</li>
	 * <li>Long Time</li>
	 * <li>Medium Time</li>
	 * <li>Short Time</li>
	 * <li>pattern string, such as "MM/dd/yyyy hh:mm:ss a", "yyyy-MM-dd
	 * HH:mm:ss" and so on.</li>
	 * </ul>
	 * </td>
	 * </tr>
	 * <tr>
	 * <td width="16%">String</td>
	 * <td width="84%">
	 * <ul>
	 * <li>Upper case</li>
	 * <li>Lower case</li>
	 * <li>pattern string, such as "lt!" and so on.</li>
	 * </ul>
	 * </td>
	 * </tr>
	 * </table>
	 * 
	 * @param dataType
	 *            the data type of the value
	 * @param format
	 *            the format choice string