C++ mark ros系统“秒”转换成“年月日时分秒+毫秒”

void getDate(long long time) 
{
    int seconds = time / 1000000000 + 8 * 3600;// time zone +8
    int days = seconds / 86400;
    int year = 1970 + (int) (days / 1461) * 4; // recycled in 4 years = 1461 days
    int month = 0;
    int day = days % 1461;
    day = day > 730 ? day - 1 : day;
    year += (int) (day / 365);
    day = day % 365;
    int monthday[]{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
    for (int i = 0; i < 13; i++) {
        if (day < monthday[i + 1]) {
            month = i + 1;
            day = day - monthday[i] + 1;
            break;
        }
    }
    int sec = seconds % 86400;
    int hour = (int) (sec / 3600);
    int minute = (int) (sec % 3600 / 60);
    int second = sec % 60;
    int nanoseconds = time % 1000000000;
    int millisecond = nanoseconds / 1000;

    std::cout << year << "/" << month << "/" << day << " " << hour << ":"
         << minute << ":" << second << "." << millisecond << std::endl;
}

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