cpp-datetime

SYSTEMTIME time;
GetSystemTime(&time);

char msg[9];
sprintf(msg, "%04d%02d%02d", st.wYear, st.wMonth, st.wDay);

std::time_t getTimeStamp()
{
    std::chrono::time_point<std::chrono::system_clock,std::chrono::milliseconds> tp = std::chrono::time_point_cast<std::chrono::milliseconds>(std::chrono::system_clock::now());
    auto tmp=std::chrono::duration_cast<std::chrono::milliseconds>(tp.time_since_epoch());
    std::time_t timestamp = tmp.count();
    return timestamp;
}

std::tm* (int64 timestamp)
{
    int64 milli = timestamp+ (int64)8*60*60*1000;
    auto mTime = std::chrono::milliseconds(milli);
    auto tp=std::chrono::time_point<std::chrono::system_clock,std::chrono::milliseconds>(mTime);
    auto tt = std::chrono::system_clock::to_time_t(tp);
    std::tm* now = std::gmtime(&tt);
    printf("%4d年%02d月%02d日 %02d:%02d:%02dn",now->tm_year+1900,now->tm_mon+1,now->tm_mday,now->tm_hour,now->tm_min,now->tm_sec);
   return now;
}