date.h

#include <iostream>
#include <string>
#include <Windows.h>
using namespace std;
class Date {
    unsigned day;
    unsigned month;
    unsigned year;
    unsigned hour;
    unsigned minute;
    unsigned second;
    unsigned millisecond;
public:
    Date (): day(0), month(0), year(0), hour(0), minute(0), second(0), millisecond(0) {}
    Date (unsigned da, unsigned mo, unsigned ye, unsigned ho, unsigned mi, unsigned se, unsigned mil):
    day(da), month(mo), year(ye), hour(ho), minute(mi), second(se), millisecond(mil) {}
    Date now() {
        SYSTEMTIME st;
        GetSystemTime(&st);
        day=st.wDay;
        month=st.wMonth;
        year=st.wYear;
        hour=st.wHour;
        minute=st.wMinute;
        second=st.wSecond;
        millisecond=st.wMilliseconds;
        return *this;
    }
    friend ostream & operator << (ostream & os, const Date & d) {
        if (d.day<10) cout<<"0";
        cout<<d.day<<"/";
        if (d.month<10) cout<<"0";
        cout<<d.month<<"/";
        cout<<d.year<<" ";
        if (d.hour<10) cout<<"0";
        cout<<d.hour<<":";
        if (d.minute<10) cout<<"0";
        cout<<d.minute<<":";
        if (d.second<10) cout<<"0";
        cout<<d.second<<"."<<d.millisecond;
        return os;
    }
    friend istream & operator >> (istream & is, Date & d) {
        cout<<"Enter day: ";
        is>>d.day;
        cout<<"Enter month: ";
        is>>d.month;
        cout<<"Enter year: ";
        is>>d.year;
        cout<<"Enter hour: ";
        is>>d.hour;
        cout<<"Enter minute: ";
        is>>d.minute;
        cout<<"Enter second: ";
        is>>d.second;
        cout<<"Enter millisecond: ";
        is>>d.millisecond;
        return is;
    }
    int operator - (const Date & d) {
        int res=0;
        res+=this->day-d.day;
        res+=(this->month-d.month)*30;
        res+=(this->year-d.year)*365;
        return res;
    }
    void print_time() const {
        if (hour<10) cout<<"0";
        cout<<hour<<":";
        if (minute<10) cout<<"0";
        cout<<minute<<":";
        if (second<10) cout<<"0";
        cout<<second<<"."<<millisecond<<endl;
    }
    void get_date(string s="") {
        if (s=="") cin>>s;
        unsigned n=s.length();
        unsigned i=0;
        while (i<n) {
            switch (s[i]) {
                case 'd':
                case 'D': {
                    if (day<10) cout<<"0";
                    cout<<day;
                    i+=2;
                } break;
                case 'M': {
                    switch (month) {
                    case 1: cout<<"Jan"; break;
                    case 2: cout<<"Feb"; break;
                    case 3: cout<<"Mar"; break;
                    case 4: cout<<"Apr"; break;
                    case 5: cout<<"May"; break;
                    case 6: cout<<"Jun"; break;
                    case 7: cout<<"Jul"; break;
                    case 8: cout<<"Aug"; break;
                    case 9: cout<<"Sep"; break;
                    case 10: cout<<"Oct"; break;
                    case 11: cout<<"Nov"; break;
                    case 12: cout<<"Dec"; break;
                    default: break;
                    }
                    i+=2;
                } break;
                case 'm': {
                    if (month<10) cout<<"0";
                    cout<<month;
                    i+=2;
                } break;
                case 'y':
                case 'Y': {
                    if ((s[i+2]=='Y')||(s[i+2]=='y')) {
                        cout<<year;
                        i+=4;
                    }
                    else {
                        double a1=year;
                        double a2=100;
                        double a3=(int)(a1/100);
                        cout<<(a1/a2-a3)*100;
                        i+=2;
                    }
                } break;
                case '.': {
                    cout<<".";
                    i+=1;
                } break;
                case '/': {
                    cout<<"/";
                    i+=1;
                } break;
                case '-': {
                    cout<<"-";
                    i+=1;
                } break;
                case ' ': {
                    cout<<" ";
                    i+=1;
                } break;
                default: i+=1; break;
            }
        }
        cout<<endl;
    }
    void get_time(string s="") {
        if (s=="") cin>>s;
        unsigned n=s.length();
        unsigned i=0;
        bool ampm=false;
        while (i<n) {
            switch (s[i]) {
                case 'h': {
                    if (hour>12) {
                        if ((hour-12)<10) cout<<"0";
                        cout<<hour-12;
                    }
                    else {
                        if (hour<10) cout<<"0";
                        cout<<hour;
                    }
                    ampm=true;
                    i+=2;
                } break;
                case 'H': {
                    if (hour<10) cout<<"0";
                    cout<<hour;
                    i+=2;
                } break;
                case 'm':
                case 'M': {
                    if (minute<10) cout<<"0";
                    cout<<minute;
                    i+=2;
                } break;
                case 's':
                case 'S': {
                    if (second<10) cout<<"0";
                    cout<<second;
                    i+=2;
                } break;
                default: break;
            }
            if (i<n) cout<<":";
        }
        if ((ampm==true)&&(hour<12)) cout<<" AM";
            else if ((ampm==true)&&(hour>=12)) cout<<" PM";
            cout<<endl;
    }
    unsigned get_day() const {return day;}
    unsigned get_month() const {return month;}
    unsigned get_year() const {return year;}
    unsigned get_hour() const {return hour;}
    unsigned get_minute() const {return minute;}
    unsigned get_second() const {return second;}
    unsigned get_millisecond() const {return millisecond;}
    void set_day(unsigned d) {day=d;}
    void set_month(unsigned m) {month=m;}
    void set_year(unsigned y) {year=y;}
    void set_hour(unsigned h) {hour=h;}
    void set_minute(unsigned m) {minute=m;}
    void set_second(unsigned s) {second=s;}
    void set_millisecond(unsigned m) {millisecond=m;}
};