C++获取年月日

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#include <stdlib.h> #include <stdio.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <pthread.h> #include <fcntl.h> #include <stdbool.h>   #include <sys/ipc.h> #include <sys/msg.h> #include <sys/time.h> #include <sys/types.h> #include <sys/stat.h> #include <stdio.h> #include <string.h>   #include <iostream> using namespace std; static const size_t MAX_TIME_STRING_LEN = 128 ; // get current YYYYMMDD bool getLocalDate(string& strDate) {         struct tm newTM;         time_t tmpTimeSec ;         struct timeval timeVal ;         gettimeofday(&timeVal, NULL) ;         tmpTimeSec = timeVal.tv_sec ;               localtime_r( &(tmpTimeSec), &newTM);         char chTmp[10]; memset(chTmp, 0, 10);         snprintf(chTmp, MAX_TIME_STRING_LEN, "%04d%02d%02d", (newTM.tm_year+1900), newTM.tm_mon+1, newTM.tm_mday ) ;         strDate = chTmp;         return true ; }   int main() {    string str123;   getLocalDate(str123);    cout<<str123<<endl;    cout<<"2021,新年快乐"<<endl;    return 0; }