period.cpp

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#include "./period.h"
 
namespace CppUtilities {
 
Period::Period(DateTime begin, DateTime end)
{
    m_years = end.year() - begin.year();
    m_months = end.month() - begin.month();
    if (m_months < 0) {
        m_months += 12;
        --m_years;
    }
    m_days = end.day() - begin.day();
    if (m_days < 0) {
        m_days += end.month() > 1 ? DateTime::daysInMonth(end.year(), end.month() - 1) : 31;
        --m_months;
    }
    if (m_months < 0) {
        m_months += 12;
        --m_years;
    }
}
 
DateTime operator+(DateTime begin, Period period)
{
    auto year = begin.year() + period.years();
    auto month = begin.month() + period.months();
    if (month > 12) {
        month -= 12;
        ++year;
    }
    auto day = begin.day() + period.days();
    const auto maxDays = DateTime::daysInMonth(year, month);
    if (day > maxDays) {
        day -= maxDays;
        ++month;
    }
    if (month > 12) {
        month -= 12;
        ++year;
    }
    return DateTime::fromDate(year, month, day) + begin.timeOfDay();
}
 
} // namespace CppUtilities