dated filename

#include <time.h>
#include <stdio.h>

using namespace std;

int main(){
    time_t t = time(NULL);
    struct tm tm = *localtime(&t);
    char filename[50] = {0};

    sprintf(filename, "filename_%d.%d.%d_%d-%d-%d.log", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
    FILE *pFile;

    pFile = fopen(filename, "w");
    fprintf(pFile, filename);

    fclose(pFile);


    return 0;
}