class DateValidator {

	public static boolean validate(final String date) {

		Matcher matcher = pattern.matcher(date);

		if (matcher.matches()) {

			matcher.reset();

			if (matcher.find()) {

				int year = Integer.parseInt(matcher.group(1));
				String month = matcher.group(2);
				String day = matcher.group(3);

				if (day.equals("31")
						&& (month.equals("4") || month.equals("6")
								|| month.equals("9") || month.equals("11")
								|| month.equals("04") || month.equals("06") || month
									.equals("09"))) {
					return false; // only 1,3,5,7,8,10,12 has 31 days
				} else if (month.equals("2") || month.equals("02")) {
					// leap year
					if (year % 4 == 0) {
						if (day.equals("30") || day.equals("31")) {
							return false;
						} else {
							return true;
						}
					} else {
						if (day.equals("29") || day.equals("30")
								|| day.equals("31")) {
							return false;
						} else {
							return true;
						}
					}
				} else {
					return true;
				}
			} else {
				return false;
			}
		} else {
			return false;
		}
	}

}