linux c++获取年月日

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#include <stdio.h> #include <string.h> #include <string> #include <iostream> using namespace std; #define CHAR char int GetDate(const string &fmt, string &result) {     CHAR buf[256];     time_t  currtime;     time(&currtime);     struct tm *today = localtime(&currtime);     if(strftime(buf, 256, fmt.c_str(), today)>0)     {         result = string(buf);         return result.size();     }     return -1; }      int main() {    string Val;    GetDate("%Y-%m-%d",Val);;    cout<<Val<<endl;    return 0; }