Some School stuff (14)

#include <iostream>

using namespace std;

class Date
{
public:
    Date (int, int, int);

private:
    int day;
    int month;
    int year;

friend ostream& operator << (ostream&, const Date&);
};

Date::Date(int dy, int mn, int yr)
{
    day = dy;
    month = mn;
    year = yr;
}

ostream& operator << (ostream& os, const Date& x)
{
    os <<x.day<<"/"<<x.month<<"/"<<x.year;
    return os;
}

class Student
{
public:
    Student(const string&, const int&, const Date&, const Date&);

private:

    string name;
    int matricno;
    const Date birthDate;
    const Date regDate;

friend ostream& operator << (ostream&, const Student&);
};

Student::Student (const string& n, const int& mat, const Date &DOB, const Date &DOR)
    : birthDate(DOB), regDate(DOR)
    {
        name = n;
        matricno = mat;
    }

ostream& operator << (ostream& os, const Student& course)
{
    os << "Student's name: " << course.name << endl;
    os << "Student's matric no: " << course.matricno << endl;
    os << "Date of birth: " << course.birthDate << endl;
    os << "Date of registration: " << course.regDate << endl;
    return os;
}

int main ()
{
    Date birth (24, 7, 1997);
    Date reg (3, 9, 2015);

    Student physics ("Hanisah", 1319987, birth, reg);

    cout << physics << endl;
    return 0;
}