Как подключить библиотеку Date в xcode?

struct Date
{   int y, d;
 
    ... /// Тут добавляем нужные вам методы.
};

#include "date.h"

struct Date
{   int y, d;
 
    ... /// Тут добавляем нужные вам методы.
};

#include "Date.h"
...
Date birth;

#include <iostream>
#include <string>
using namespace std;
 
struct Date
{   int y, d;
    Date() : y(2020), d(33) {}
    ///... /// Тут добавляем нужные вам методы.
    void set(int _y, int _d)
    {   y = _y;
        d = _d;
    }
};
ostream& operator<<(ostream& out, Date& obj)
    {   out << obj.y << " - "<< obj.d;
        return out;
    }
 
class Passport
{   protected:
        string Name;
        string Surname;
        string City_birth;
        Date   birth;
        string Issued_by;
        Date   date_issue;
        string series;
        int number;
 
    public:
        //Passport();
        Passport(   string Name,
                    string Surname, 
                    string City_birth, 
                    string Issued_by,
                    string series, 
                    int number);
        ~Passport();
        
        void set_bithd(int _y, int _d)
        {   birth.set(_y, _d);
        }
 
        string getName();
        string getSurname();
        string getCity_birth();
        string getIssued_by();
        string getseries();
        int getnumber();
 
        friend ostream& operator<<(ostream& out, Passport& obj);
};
Passport::Passport(string Name,string Surname, string City_birth,
                   string Issued_by, string series, int number)
{   this->Name = Name;
    this->Surname = Surname;
    this->City_birth = City_birth;
    this->Issued_by = Issued_by;
    this->series = series;
    this->number = number;
}
 
Passport::~Passport() {}
 
string Passport::getName()
{   return Name;
}
 
string Passport::getSurname()
{   return Surname;
}
 
string Passport::getCity_birth()
{   return City_birth;
}
 
string Passport::getIssued_by()
{   return Issued_by;
}
 
string Passport::getseries()
{   return series;
}
 
int Passport::getnumber()
{   return number;
}
 
ostream& operator<<(ostream& out, Passport& obj)
{
// TODO: вставьте здесь оператор return
    out << " My Passport -------------------- : " << endl
        << " Surname      : " << obj.getSurname() << endl
        << " Name         : " << obj.Name         << endl
        << " City_birth   : " << obj.City_birth   << endl
        << " Birthday     : " << obj.birth        << endl
        << " Issued_by    : " << obj.Issued_by    << endl
        << " Date of issue: " << obj.date_issue   << endl
        << " Series       : " << obj.series       << endl
        << " Number       : " << obj.number       << endl;
    return out;
 
}
class ForeignPassport : public Passport
{   protected:
        string citizenship;
        Date validity;
        int numberVisas;
 
    public:
        //ForeignPassport();
        ForeignPassport(string Name, string Surname, string City_birth,
                                 string Issued_by, string series, int number, string citizenship)
    : Passport(Name, Surname, City_birth, Issued_by, series, number)
{   this->citizenship = citizenship;
}
        ~ForeignPassport();
 
        friend ostream& operator<<(ostream& out, ForeignPassport& obj);
};
 
ForeignPassport::~ForeignPassport() {}
 
ostream& operator<<(ostream& out, ForeignPassport& obj)
{   cout << " My ForeignPassport ------------- :"    << endl
         << " Surname        : " << obj.getSurname() << endl
         << " Name           : " << obj.Name         << endl
         << " Citizenship    : " << obj.citizenship  << endl
         << " Birthday       : " << obj.birth        << endl
         << " Validity       : " << obj.validity     << endl
         << " Number of Visas: " << obj.numberVisas  << endl;
    return out;
}
 
///----------------------------------------------------------------------------:
int main()
{
    Passport passp("Vasia", "Pupkin", "Bomjogorsk", "1234", "4321", 888);
    passp.set_bithd(2001, 7);
    cout << passp;
    
    getchar();
}