#ifndef DATE_H
#define DATE_H

#include <iostream>
using namespace std;

/*
This is the header file for class date.
Jan  1, 0 AD is day   0
Jan  2, 0 AD is day   1
Dec 31, 0 AD is day 364
Jan  1, 1 AD is day 365
etc.
so  day / 365 is the year
and day % 365 is the day of the year (in the range 0 to 364 inclusive)
*/

class date {
	int day;
	static const int length[];
public:
	date(int m, int d, int y);
	date();   //Put today's date into the newborn object.
	date& operator+=(int n) {day += n; return *this;}
	date& operator-=(int n) {day -= n; return *this;}

	friend bool operator==(const date& d1, const date& d2) {return d1.day == d2.day;}
	friend bool operator<(const date& d1, const date& d2) {return d1.day < d2.day;}
	friend int operator-(const date& d1, const date& d2) {return d1.day - d2.day;}

	friend ostream& operator<<(ostream& ost, const date& d);
	friend istream& operator>>(istream& ist, date& d);
};

inline date& operator++(date& d) {return d += 1;} 
inline date& operator--(date& d) {return d -= 1;}

inline const date operator+(date d, int n) {return d += n;}   //JF of Pr
inline const date operator+(int n, date d) {return d += n;}
inline const date operator-(date d, int n) {return d -= n;}
inline const date operator++(date& d, int)
{
	const date old {d};   //Call the copy constructor.
	++d;
	return old;
}

inline const date operator--(date& d, int)
{
	const date old {d};
	--d;
	return old;
}

inline bool operator> (const date& d1, const date& d2) {return d2 < d1;}
inline bool operator<=(const date& d1, const date& d2) {return !(d1 > d2);}
inline bool operator>=(const date& d1, const date& d2) {return d2 <= d1;}
inline bool operator!=(const date& d1, const date& d2) {return !(d1 == d2);}

#endif