#include <iostream>
class Date {
public:

	Date(int day, int month, int year);
	Date(const Date &o);
	Date& operator=(const Date &o);
	~Date();

	bool operator<(const Date &o) const{
		return compare(o)<0;
	}
	void add_days(int n);
	int compare(const Date &o) const;
	bool leap_year() const;
	
	int get_day() const;
	int get_month() const;
	int get_year() const;
	const char* day_of_week() const;
	const char* month_name() const;
	ostream& output(ostream &os) const ;

private:
	int d;
	int m;
	int y;

	void fix_invalid();
	int days_in_month(int month, int year) const;
	
};

ostream& operator<<(ostream& os, const Date &d);