c++ date class

date.cpp

//update:
/// this is just some exercise code in the book i study so i thought it could be useful to some people about the methods in the code
/// changes:
///   added:
///   class operator function Date operator(Date&) - with this you can now assign a date object to another date object
///   class JulianDate: methods ->> object.jdatedisplay() - displays the julian date
////                                ->> object.Date(); - converts and diplays the julian date to gregorian date
///                                 ->> overloaded constructor ->  JulianDate(int month, int day, int year); expects to have the values
////                                                                                                         and converts to julian date
///
///   overloaded constructor in class Date(long) - expects to have a long values
///   object.Juliandate(&object) - converts the date(gregorian date) into julian date
///   OBJ_latestdate(); - this compares two object date arguments -> OBJ_latestdate(a.setdate1(xx,xxx,xxxx),b.setdate1(xx,xx,xxxx));
///   object.latestDate() - this compares the date the statement is: latestdate(setDate1(),setDate2());
///   object.showDate1(); change the methods name to be precise - this displays the date1
///   object.setDate1(); change the methods name to be precise - this sets the date1  (mm,dd,yyyy);
///   object.showDate2(); displays the set day2 method
///   object.setDate2(); sets the date 2 (mm,dd,yyyy);
///   object.backDay(); - this sets reverse the day; (look for the code if your curious what it does)
//     object.convertDate(); - converts the date into ex:4/1/2014 into 20140401 this is useful for sorting dates in choronological order
//     object.leapyr(); - this detects the date if the date is a leap year or not
//     object.dayofWeek(); - this detects what day is the date you entered
//     object.nextDay(); - this adds another day (look for the code if your curious what it does)
///    create class type Date before using one of the date class methods
///    time class methods
/////  object.setTime(h, m, s); sets the time;
///    object.showtime(); shows the time;
/// you can edit this code if you want

#include <iostream>
#include <iomanip>
#include <string>
#include <ctime>

using namespace std;

class Date
{
    friend void OBJ_latestdate(long, long);

private:
    int month;
    int day;
    int year;
    int datesort;
    int leapyear;
    int latestdate;
    int month2;
    int day2;
    int year2;
public:
    Date(int = 7, int = 4, int = 2012);
    Date(long);
    long setDate(int, int ,int);
    int convertDate(int, int, int);
    void showDate();
    void leapyr();
    void dayofWeek();
    void nextDay();
    void backDay();
    void latestDate(long, long);
    void swapDate(Date *, Date *);
    void Juliandate(Date&);
    Date operator=(Date&);
};

Date Date::operator=(Date& assdate)
{
    month = assdate.month;
    day = assdate.day;
    year = assdate.year;

    return *this;
}

Date::Date(int mm, int dd, int yyyy)
{
    month = mm;
    day = dd;
    year = yyyy;
}

Date::Date(long mmddyyyy)
{
    year = int(mmddyyyy / 10000.0);
    month = int((mmddyyyy - year * 10000.0) / 100.0);
    day = int(mmddyyyy - year * 10000.0 - month * 100.0);
}

void Date::swapDate(Date *date1, Date *date2)
{
    Date tempdate;

    tempdate.day = date1->day;
    tempdate.month = date1->month;
    tempdate.year = date1->year;

    date1->day = date2->day;
    date1->month = date2->month;
    date1->year = date2->year;

    date2->day = tempdate.day;
    date2->month = tempdate.month;
    date2->year = tempdate.year;

    return;
}

void Date::Juliandate(Date& gregorian)
{

    long MP, YP, T, JULIANDATE;
    if(gregorian.month <= 2)
    {
        MP = 0;
        YP = gregorian.year - 1;
    }
    else
    {
        MP = int(0.4 * gregorian.month + 2.3);
        YP = gregorian.year;
    }

    T = int(YP / 4) - int(YP / 100) + int(YP / 400);
    JULIANDATE = 365 * gregorian.year + 31 * (gregorian.month - 1) + gregorian.day + T - MP;

    cout << "julian date: " << JULIANDATE << endl;

    return;

}

void OBJ_latestdate(long yyyymmdd, long xxxxbbss)
{
    long a = yyyymmdd;
    long b = xxxxbbss;
    int month, year, day;
    int month2, year2, day2;



    if(a > b){

    year = int(a / 10000.0);
    month = int((a - year * 10000.0) / 100.00);
    day = int(a - year * 10000.0 - month * 100.0);

    cout << endl;
    cout << "\nlatest date: ";
    cout << setfill('0')
         << setw(2) << month << '/'
         << setw(2) << day  << '/'
         << setw(2) << year;
    cout << endl;


    }
    else{
    year2 = int(b / 10000.0);
    month2 = int((b - year2 * 10000.0) / 100.00);
    day2 = int(b - year2 * 10000.0 - month2 * 100.0);

    cout << endl;
    cout << "\nlatest date: ";
    cout << setfill('0')
         << setw(2) << month2 << '/'
         << setw(2) << day2  << '/'
         << setw(2) << year2;
    cout << endl;

    }


    return;
}


void Date::latestDate(long yyyymmdd, long xxxxbbss)
{
    long a = yyyymmdd;
    long b = xxxxbbss;
    int month, year, day;
    int month2, year2, day2;



    if(a > b){

    year = int(a / 10000.0);
    month = int((a - year * 10000.0) / 100.00);
    day = int(a - year * 10000.0 - month * 100.0);

    cout << endl;
    cout << "\nlatest date: ";
    cout << setfill('0')
         << setw(2) << month << '/'
         << setw(2) << day  << '/'
         << setw(2) << year;
    cout << endl;


    }
    else{
    year2 = int(b / 10000.0);
    month2 = int((b - year2 * 10000.0) / 100.00);
    day2 = int(b - year2 * 10000.0 - month2 * 100.0);

    cout << endl;
    cout << "\nlatest date: ";
    cout << setfill('0')
         << setw(2) << month2 << '/'
         << setw(2) << day2  << '/'
         << setw(2) << year2;
    cout << endl;

    }


    return;
}


void Date::dayofWeek()
{
    int century, setyear, time, dayweek;
    string days[7] = {"saturday", "sunday", "monday", "tuesday", "wednesday", "thursday", "friday"};

    if(month < 3)
    {
        month = month + 12;
        year = year - 1;
    }
    else
    {
        century = int(year / 100);
        setyear = year % 100;
        time = day + int(26 *(month + 1) / 10) + setyear + int(setyear / 4) *
               int(century / 4) - 2 * century;
        dayweek = time % 7;
    }
    if(dayweek < 0)
    {
        dayweek = dayweek + 7;
    }

    for(int a = 0; a < 7; a++)
    {
        if(dayweek == a)
        {
            cout << "the day is " << days[a] << endl;
        }
    }
}

void Date::leapyr()
{
    leapyear = year % 4;
    if(leapyear == 0)
        cout << "\nthis is a leap year: " << year;
    else
        cout << "\nnot a leap year: " << year;

    return;
}

int Date::convertDate(int month, int day, int year)
{
    datesort = (year * 10000) + (month * 100) + day;
    return datesort;
}

long Date::setDate(int mm, int dd, int yyyy)
{
    long longdate;

    month = mm;
    day = dd;
    year = yyyy;

    longdate = convertDate(month, day, year);

    return longdate;
}

void Date::showDate()
{

    cout << endl;
    cout << "\nthe date is ";
    cout << setfill('0')
         << setw(2) << month << '/'
         << setw(2) << day  << '/'
         << setw(2) << year % 100;
    cout << endl;

    return;
}

void Date::nextDay()
{
    day++;
    if(day == 32)
    {
        day = day - 31;
        month++;
        if(month == 13)
        {
            month = month - 12;
            year++;

        }
    }
    else
    {
        month = month;
        year = year;
    }
}

class Time{
private:
    int hours;
    int minutes;
    int seconds;
    int nanoseconds;
    int milliseconds;
    unsigned int start = clock();

public:
    Time(int = 0, int = 0, int = 0, int = 0, int = 0);
    void setTime(int, int, int);
    void timerunning();
    void showtime();
    void stopwatch();
};


Time::Time(int h, int m, int s, int nn, int mm)
{
    hours = h;
    minutes = m;
    seconds = s;
    nanoseconds = nn;
    milliseconds = mm;
}

void Time::showtime()
{
    cout << endl;
    cout << "time: "
         << setfill('0')
         << setw(2) << hours << ":" << setw(2) << minutes << ":" << setw(2) << seconds << ":" << setw(2) << nanoseconds << endl;
 }

void Time::timerunning()
{
    milliseconds++;
    if(milliseconds == 25)
    {
        milliseconds = 0;
        nanoseconds++;
        if(nanoseconds == 10)
        {
            nanoseconds = 0;
            seconds++;
            if(seconds == 60)
            {
                seconds = 0;
                minutes++;
                if(minutes == 60)
                {
                    minutes = 0;
                    hours++;
                    if(hours == 24)
                    {
                        milliseconds = 0;
                        nanoseconds = 0;
                        seconds = 0;
                        minutes = 0;
                        hours = 0;
                    }
                }
            }
        }
    }
}

void Time::setTime(int h, int m, int s)
{
    hours = h;
    minutes = m;
    seconds = s;
}

void Date::backDay()
{

    day--;
    if(day == 0)
    {
        day = 31;
        month--;
        if(month == 0){
                month = 12;
            if(month == 12)
        {
            month = month;
            year--;
        }
        }

    }
    else
    {
        month = month;
        year = year;
    }

}

class JulianDate
{
private:
    long juliandate;

public:
    JulianDate(long = 000000);
    JulianDate(int month, int day, int year);
    void Jdatedisplay();
    void Date(JulianDate&);
};

JulianDate::JulianDate(long j)
{
    juliandate = j;
}

JulianDate::JulianDate(int mm, int dd, int yyyy)
{
     long MP, YP, T;
    if(mm <= 2)
    {
        MP = 0;
        YP = yyyy - 1;
    }
    else
    {
        MP = int(0.4 * mm + 2.3);
        YP = yyyy;
    }

    T = int(YP / 4) - int(YP / 100) + int(YP / 400);
    juliandate = 365 * yyyy + 31 * (mm - 1) + dd + T - MP;

}

void JulianDate::Jdatedisplay()
{
    cout << "julian date: " << juliandate << endl;
    return;
}





int main()
{

    Date a(12, 22, 2012), b;
    a.showDate();
    b = a;
    b.showDate();


    return 0;
}