Bug 130688 ULocal unsupported(Data)
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
if ( resultDate == null )
		{
			throw new BirtException( pluginId,
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "Date"
					},
					resourceBundle );
		}
		
		
		return resultDate;
	}
	
	/**
	 * Convert string to date with check.
	 * JDK may do incorrect converse, for example:
	 * 		2005/1/1 Local.US, format pattern is MM/dd/YY.
	 * Above conversion can be done without error, but obviously
	 * the result is not right. This method will do such a simple check,
	 * in DateFormat.SHORT case instead of all cases.
	 * 		Year is not lower than 0.
	 * 		Month is from 1 to 12.
	 * 		Day is from 1 to 31.  
	 * @param source
	 * @param locale
	 * @return Date
	 * @throws BirtException
	 */