Function LeapYearCount

util/datetime/systime.cpp:99–101

    constexpr ui32 FOUR_CENTURY_YEARS = 400;

    constexpr ui32 LeapYearCount(ui32 years) {
        return years / 4 - years / 100 + years / 400;
    }

    constexpr ui32 FOUR_CENTURY_DAYS = FOUR_CENTURY_YEARS * DAYS_IN_YEAR + LeapYearCount(FOUR_CENTURY_YEARS);