datetime

C++ implementation

node {
    meta {
        using Type = uint32_t;
    }

    static constexpr unsigned long SECS_PER_MIN = 60;
    static constexpr unsigned long SECS_PER_HOUR = 3600;
    static constexpr unsigned long SECS_PER_DAY = 24 * SECS_PER_HOUR;

    bool isLeapYear(int y) {
      return (1970 + y > 0) && !((1970 + y) % 4) && (((1970 + y) % 100) || !((1970 + y) % 400));
    }

    void evaluate(Context ctx) {
        static const uint8_t monthDays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

        uint16_t fullYear = getValue<input_YEAR>(ctx);
        uint8_t mon = getValue<input_MON>(ctx);
        uint8_t day = getValue<input_DAY>(ctx);
        uint8_t hour = getValue<input_HOUR>(ctx);
        uint8_t min = getValue<input_MIN>(ctx);
        uint8_t sec = getValue<input_SEC>(ctx);

        uint8_t year = fullYear - 1970;

        uint8_t i;
        Type seconds = year * (SECS_PER_DAY * 365);

        for (i = 0; i < year; i++) {
            if (isLeapYear(i)) {
                seconds += SECS_PER_DAY;
            }
        }

        bool leap = isLeapYear(year);
        constexpr uint8_t february = 2;
        for (i = 1; i < mon; ++i) {
            seconds += SECS_PER_DAY * ((i == february && leap) ? 29 : monthDays[i - 1]);
        }

        seconds += (day - 1) * SECS_PER_DAY;
        seconds += hour * SECS_PER_HOUR;
        seconds += min * SECS_PER_MIN;
        seconds += sec;
        emitValue<output_OUT>(ctx, seconds);
    }
}