@SuppressWarnings("rawtypes")
	public Date convert(Class type, Object value) {
		if (!(value instanceof String))
			throw new RuntimeException("wrong input value");
		try {
			SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
			sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
			return sdf.parse((String) value);
		} catch (ParseException e) {
			return null;
		}
	}