cocos2d-x获取系统时间

   用cocos2d-x获取系统时间，格式为年月日时分秒：

void GetTime(float dt)
 {
    struct tm *tm;
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)  

    //win32平台
    time_t timep;  
    time(&timep); 
    tm = localtime(&timep);
#else  

    //android、ios平台

    struct cc_timeval now; 
    CCTime::gettimeofdayCocos2d(&now, NULL);
    tm = localtime(&now.tv_sec);
#endif  
     int year = tm->tm_year + 1900;
     int month = tm->tm_mon + 1;
     int day = tm->tm_mday;
     int hour=tm->tm_hour;
     int min=tm->tm_min;
     int second=tm->tm_sec; 
}