Create a folder monthly

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

extern int errno;

int main(int, char*)
{
      time_t t;
      time(&t);
      tm* ptm = localtime(&t);

      char sz[100];
      sprintf(sz, "%2.2d-%2.2d", ptm->tm_mon + 1, ptm->tm_year);

      int nRet = mkdir(sz);
      if (nRet == 0)
            puts("Created successfully.");
      else
            if (errno == EEXIST)
                  puts("Already exists!");

      return nRet;
}