C++：获取当前系统时间并返回

string getTime()
{
   struct
tm *tm;
   struct
timeval now;
   gettimeofday(&now,
NULL);
    tm =localtime(&now.tv_sec);
    
   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;
    
   char ptime[100];
//返回时分秒
   sprintf(ptime,
"%2d:%2d:%2d", hour, min, second);
   string strTime(ptime);
   return strTime;
}