Java/MyDate.java at main · SeherBalibay/Java · GitHub

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public class MyDate {
	int day;
	int month; // should be incremented by one before printing
	int year;

	int[] maxDays = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

	public MyDate(int day, int month, int year) {
		this.day = day;
		this.month = month-1; //0 represents January  11 represents December
		this.year = year;
	}

	public void incrementDay() {
		int newDay = day+1;
		if (newDay > maxDays[month]){
			day =1;
			incrementMonth();
		}else if(month == 1 && newDay ==29 && !inLeapYear()){
			day =1;
			incrementMonth();	//will also handle the change in year
		}else{
			day = newDay;
		}

	}


	public void decrementDay() {
		int newDay = day - 1;
		if (newDay == 0){
			day = 31;
			decrementMonth(); //will also adjust the day to its max and handle the change in year
		}else{
			day = newDay;
		}

	}

	public void incrementDay(int i) {
		while (i > 0){
			incrementDay();
			i--;
		}

	}

	public void decrementDay(int i) {
		while (i > 0){
			decrementDay();
			i--;
		}

	}


	public void incrementMonth(int i) {
		int newMonth = (month + i) % 12;
		int yearChange = 0;

		if (newMonth < 0) {
			newMonth += 12;
			yearChange = -1;
		}

		yearChange += (month + i) / 12;
		month = newMonth;
		year += yearChange;
		if (day > maxDays[month]){
			day = maxDays[month];
			if(month ==1 && day ==29 && !inLeapYear()){
				day =28;
			}
		}
	}


	public void incrementMonth() {
		incrementMonth(1);

	}

	public void decrementMonth(int i) {
		incrementMonth(-i);

	}

	public void decrementMonth() {
		incrementMonth(-1);

	}

	public void incrementYear(int i) {
		year+=i;
		if (month ==1 && day ==29 && !inLeapYear()){
			day = 28;
		}

	}

	public void incrementYear() {
		incrementYear(1);

	}

	public void decrementYear() {
		incrementYear(-1);
	}


	public void decrementYear(int i) {
		incrementYear(-i);

	}


	public boolean isBefore(MyDate anotherDate) {
		int a = Integer.parseInt(toString().replaceAll("-", "")) ;

		int b = Integer.parseInt(anotherDate.toString().replaceAll("-", ""));

		return a < b;
	}

	public int dayDifference(MyDate anotherDate) {
		int diff = 0;
		if (isBefore(anotherDate)){
			MyDate date = new MyDate(day,month+1,year); //a copy of current object
			while (date.isBefore(anotherDate)){
				date.incrementDay();
				diff++;
			}
		}else if(isAfter(anotherDate)){
			MyDate date = new MyDate(day,month+1,year); // a copy of current object
			while (date.isAfter(anotherDate)){
				date.decrementDay();
				diff++;
			}

		}
		return diff;
	}

	public boolean isAfter(MyDate anotherDate) {
		int a = Integer.parseInt(toString().replaceAll("-", "")) ;
		int b = Integer.parseInt(anotherDate.toString().replaceAll("-", ""));
		return a > b;
	}

	public String toString(){
		return year + "-"+(month + 1 < 10 ? "0" : "") + (month + 1) + "-" +(day < 10 ? "0" : "") + day;
	}

	public boolean inLeapYear(){
		return year % 4 == 0 ? true : false;
	}
}