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public class Date212 implements Comparable<Date212> {

	private int day;

	private int month;

	private int year;

	// array to represent days in a month, assuming february has 29 days

	private static int[] daysInMonth = { 31, 29, 31, 30, 31, 30, 31, 31, 30,

			31, 30, 31 };

	public Date212(String str) throws Date212Exception {

		str = str.trim();// removing trailing spaces

		// checking if string contains valid date

		if (!isValid(str)) {

			// throwing exception

			throw new Date212Exception(str + " represents an invalid date!");

		} else {

			// valid date, assigning values

			this.year = Integer.parseInt(str.substring(0, 4));

			this.month = Integer.parseInt(str.substring(4, 6));

			this.day = Integer.parseInt(str.substring(6));

		}

	}

	// getters and setters

	public int getDay() {

		return day;

	}

	public int getMonth() {

		return month;

	}

	public int getYear() {

		return year;

	}

	public void setDay(int day) {

		this.day = day;

	}

	public void setMonth(int month) {

		this.month = month;

	}

	public void setYear(int year) {

		this.year = year;

	}

	@Override

	public String toString() {

		// returns date in mm/dd/yyyy format

		return format(month) + "/" + format(day) + "/" + year;

	}

	// method to format a date/month value, to have a leading 0 if it is below

	// 10. Example format(7) will return 07, format(11) will return 11

	private String format(int value) {

		if (value > 9) {

			return "" + value;

		} else {

			return "0" + value;

		}

	}

	/**

	 * private helper method to check if a String contains valid date

	 */

	private boolean isValid(String str) {

		if (str.length() == 8) {

			try {

				int year = Integer.parseInt(str.substring(0, 4));

				int month = Integer.parseInt(str.substring(4, 6));

				int day = Integer.parseInt(str.substring(6));

				if (month > 0 && month <= 12) {

					// not considering leap years

					if (day > 0 && day <= daysInMonth[month - 1]) {

						// valid date

						return true;

					}

				}

			} catch (Exception e) {

			}

		}

		// some test failed, invalid date

		return false;

	}

	@Override

	public int compareTo(Date212 other) {

		// comparing by year

		if (this.year < other.year) {

			return -1;

		} else if (this.year > other.year) {

			return 1;

		} else {

			// years are same, comparing by month

			if (this.month < other.month) {

				return -1;

			} else if (this.month > other.month) {

				return 1;

			} else {

				// months are same, comparing by day

				if (this.day < other.day) {

					return -1;

				} else if (this.day > other.day) {

					return 1;

				}

			}

		}

		return 0; // dates are equal

	}

}
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