#include <iostream>
#include <cstdlib>
#include <ctime>  
using namespace std;

class date {
public:
	int year;
	int month;  
	int day;   
	void print() const; 
	void next(int n);   
	void next();
	void prev(int n);   
	void prev();
};

int main()
{
	const date independenceDay {1777, 7, 4};
	independenceDay.print();
	cout << " is Independence Day.\n";
    const time_t t {time(nullptr)};
    const tm *const p {localtime(&t)};
	const date today {p->tm_year + 1900, p->tm_mon + 1, p->tm_mday};
	today.print();
	cout << " is today.\n";
	date tomorrow {today};
	tomorrow.next(); 
	tomorrow.print();
	cout << " is tomorrow.\n";
	date christmas {today};
	christmas.next(329);
	christmas.print();
	cout << " is next Christmas.\n";
	date testDate {2025, 3, 1};
	cout << "Original date: ";
	testDate.print();
	cout << "\n";
	testDate.prev();
	cout << "After going 1 day into the past: ";
	testDate.print();
	cout << "\n";

	return EXIT_SUCCESS;
}

const int date_length[] {
	 0,   
	31,   //January
	28,   //February(disregarding leap year)
	31,   //March
	30,   //April
	31,   //May
	30,   //June
	31,   //July
	31,   //August
	30,   //September
	31,   //October
	30,   //November
	31    //December
};

void date::print() const  
{
	cout << month << "/" << day << "/" << year;
}

void date::next(int n)  
{
	for (int i {0}; i < n; ++i) {
		next(); 
	}
}

void date::next()  
{
	if (day < date_length[month]) {
		++day;
	} else {
		day = 1;             
		if (month < 12) {
			++month;
		} else {
			month = 1;   
			++year;
		}
	}
}

void date::prev(int n)   
{
	for (int i {0}; i < n; ++i) {
		prev(); 
	}
}

void date::prev()  
{
	if (day > 1) {
		--day;
	} else {
		if (month > 1) {
			--month;
			day = date_length[month];
		} else {
			month = 12;  
			--year;
			day = date_length[month];
		}
	}
}