Function LeapYearAD

util/draft/datetime.h:22–24

    }

    inline bool LeapYearAD(ui32 year) {
        return (!(year % 4) && (year % 100)) || !(year % 400);
    }

    inline ui32 YDayFromMonthAndDay(ui32 month /*0 - based*/, ui32 mday /*1 - based*/, bool isleap) {
        return MonthDaysNewYear[isleap][Min(month, (ui32)11u)] + mday - 1;