Develop a class called date which will involve a variety of operator overloads. A date object will store a date in terms of day of month, month and year.

#include <iostream>
using namespace std;

class Date
{
public:
   Date();
   Date(int day, int month, int year);
   bool operator==(const Date& that) const;
   bool operator!=(const Date& that) const;
   bool operator<(const Date& that) const;
   bool operator>(const Date& that) const;
private:
   int day_;
   int month_;
   int year_;
   static const int DaysPerMonth[12];
};

//  You may find this useful!
//
const int Date::DaysPerMonth[12] =
   {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

Date::Date() : year_(1900), month_(1), day_(1) { }

Date::Date(int day, int month, int year) :
   day_(day),
   month_(month),
   year_(year)
{
   //  TBC (to be coded).  What if the date doesn't exist?
}

//  Think about operators that can be implemented just by calling other ones.
//
bool Date::operator==(const Date& that) const
{
   //  TBC.
   //
   return false;
}

bool Date::operator!=(const Date& that) const
{
   //  TBC.
   //
   return false;
}

bool Date::operator<(const Date& that) const
{
   //  TBC.
   //
   return false;
}

bool Date::operator>(const Date& that) const
{
   //  TBC.
   //
   return false;
}

//  Investigate why operator<< and operator>> (when used for output and input)
//  are implemented outside the class, not as members.
//
ostream& operator<<(ostream& stream, const Date& date)
{
   //  TBC.  Display DATE in STREAM.  How will you read Date's private data?
   //
   return stream;
}

istream& operator>>(istream& stream, Date& date)
{
   //  TBC.  Update DATE by reading input from STREAM.  How will you change
   //  Date's private data?  What if the input specifies an invalid date?
   //
   return stream;
}

int main()
{
   Date d1, d2(1,2,2017);

   cin >> d1;

   if(d1 < d2)
      cout << d1 << " is before " << d2;
   else if(d1 > d2)
      cout << d2 << " is before " << d1;
   else
      cout << "The dates are equal.";

   cout << endl;
   return 0;
}