#include <stdexcept>
#include <vector>
#include <iostream>

using namespace std;

class Date{
private:
    int day, month, year;

public:
    Date(const int& d, const int& m, const int& y) {
        if (((d >= 1) && (m >= 1) && (y >= 1970)) &&
                ((d <= 31) && (m <= 12) && (y <=2099))) {
                    if ((m == 1) || (m == 3) || (m ==5) || (m == 7) || (m == 8) || (m == 10) || (m == 12)) {
                        day = d;
                        month = m;
                        year = y;
                    }
                    else if ((m == 4) || (m == 6) || (m == 9) || (m == 11)) {
                        if (d <= 30) {
                            day = d;
                            month = m;
                            year = y;
                        } else {
                            throw std::invalid_argument("invalid_argument");
                        }
                    } else if (m == 2) {
                        if ((y % 4 == 0 && y % 100 != 0) || (y % 400 == 0)) {
                            if (d <= 29) {
                                day = d;
                                month = m;
                                year = y;
                            } else {
                                throw std::invalid_argument("invalid_argument");
                            }
                        } else if (d <= 28) {
                            day = d;
                            month = m;
                            year = y;
                        } else {
                            throw std::invalid_argument("invalid_argument");
                        }
                    }
        } else {
            throw std::invalid_argument("invalid_argument");
        }
    }
    size_t GetDay() const {
        return day;
    }
    size_t GetMonth() const {
        return month;
    }
    size_t GetYear() const {
        return year;
    }
    void operator++ () {
        if ((month <= 7 && month % 2 == 1) || (month >= 8 && month % 2 == 0)) {
            if (day == 31) {
                if (month == 12) {
                    day = 1;
                    month = 1;
                    ++year;
                } else {
                    day = 1;
                    ++month;
                }
            } else {
                ++day;
            }
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
            if (day == 30) {
                day = 1;
                ++month;
            } else {
                ++day;
            }
        } else if (month == 2) {
            if (((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)) {
                if (day == 29) {
                    day = 1;
                    ++month;
                } else {
                    ++day;
                }
            } else {
                if (day == 28) {
                    day = 1;
                    ++month;
                }
                else {
                    ++day;
                }
            }
        }
    }
    void operator--() {
        if ((month <= 7 && month % 2 == 1) || (month >= 8 && month % 2 == 0)) {
            if (day == 1 && month == 3) {
                if ((((year % 4 == 0 && year % 100 != 0) || year % 400 == 0))) {
                    day = 29;
                    month = 2;
                } else {
                    day = 28;
                    month = 2;
                }
            } else if (day == 1 && month == 8) {
                day = 31;
                month = 7;
            } else if (day == 1 && month == 1) {
                day = 31;
                month = 12;
                --year;
            } else if (day == 1) {
                day = 30;
                --month;
            } else {
                --day;
            }
        } else  {
            if (day == 1) {
                day = 31;
                --month;
            } else {
                --day;
            }
        }
    }
    Date operator- (int& d) {
        Date a(day, month, year);
        while (d != 0) {
            if ((month <= 7 && month % 2 == 1) || (month >= 8 && month % 2 == 0)) {
                if (a.day > d) {
                    a.day -= d;
                    d = 0;
                } else {
                    if (a.month == 3) {
                        if ((((a.year % 4 == 0 && a.year % 100 != 0) || a.year % 400 == 0))) {
                            d -= a.day;
                            a.day = 29;
                            --a.month;
                        } else {
                            d -= a.day;
                            a.day = 28;
                            --a.month;
                        }
                    } else if (a.month == 8) {
                        d -= a.day;
                        a.day = 31;
                        a.month = 7;
                    } else if (a.month == 1) {
                        d -= a.day;
                        a.day = 31;
                        a.month = 12;
                        --a.year;
                    } else {
                        d -= a.day;
                        a.day = 30;
                        --a.month;
                    }
                }
            } else {
                d -= a.day;
                a.day = 31;
                --a.month;
            }
        }
        return a;
    }
};

int main() {
    Date a(2, 3, 2012);
    --a;
    cout << a.GetDay() << '\t' << a.GetMonth() << '\t' << a.GetYear() << '\n';
    Date b = a - 5;
}