timespan.cpp

#include <QTextStream>
#include <QDateTime>

QTextStream cout(stdout);

class TimeSpan {
    qint64 _msecs;

    static const qint64 c_second  = 1000;
    static const qint64 c_minute  = 60;
    static const qint64 c_hour    = 60;
    static const qint64 c_day     = 24;
    static const qint64 c_month   = 30;
    static const qint64 c_year    = 12;

public:
    TimeSpan(QDateTime begin, QDateTime end) {
        _msecs = begin.msecsTo(end);
    }

    int GetSeconds() {
        return _msecs / c_second % c_minute;
    }

    int GetMinutes() {
        return _msecs / c_second / c_minute % c_hour;
    }

    int GetHours() {
        return _msecs / c_second / c_minute / c_hour % c_day;
    }

    int GetDays() {
        return _msecs / c_second / c_minute / c_hour / c_day % c_month;
    }

    int GetMonths() {
        return _msecs / c_second / c_minute / c_hour / c_day / c_month % c_year;
    }

    int GetYears() {
        return _msecs / c_second / c_minute / c_hour / c_day / c_month / c_year;
    }
};

int main(int argc, char *argv[])
{
    QDateTime dt = QDateTime::currentDateTimeUtc();


    QDateTime dt1(QDate(2013,04,10), QTime(10,10,10));
    QDateTime dt2(QDate(2014,04,9), QTime(10,10,10));

    TimeSpan s(dt1, dt2);

    cout << s.GetYears() << "/" << s.GetMonths() << "/" << s.GetDays() <<
            " " << s.GetHours() << ":" << s.GetMinutes() << ":" << s.GetSeconds() << endl;
}