Bug 151381 [Smoke]The parameter didn't display in the web viewer
Description: Preview a parameter in the web viewer, it can't be previewed. Step to reproduce: 1. new a report and a parameter 2. drag it to the layout 3. preview it in the web viewer Actual result: the parameter is not displayed
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
DateFormat dateFormat = DateFormatHolder.getDateInstance( DateFormat.SHORT,
				locale );
		Date resultDate = null;
		try
		{
			resultDate = dateFormat.parse( source );
		}
		catch ( ParseException e )
		{
			return toDate( source, locale );
		}
		
		if ( DateUtil.checkValid( dateFormat, source ) == false )
		{
			throw new BirtException( pluginId,
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "Date"
					},
					resourceBundle );
		}
		return resultDate;
	}
	/**
	 * Boolean -> Double
	 * 		true 	-> 1
	 * 		others 	-> 0 
	 * Date -> Double
	 * 		Date.getTime();
	 * String -> Double