D-Net

    public static boolean isDate(final String date){

        //final Pattern pattern = Pattern.compile("(\\d{4})|(\\d{4}-\\d{2})|(\\d{4}-\\d{2}--\\d{4}-d{2}|(\\d{4}--\\d{4}))");

        final Matcher matcher = pattern.matcher(date);

        return matcher.find();

    }