#include <iostream>
#include <time.h>
int main ()
{
time_t now;
struct tm newyear;
time(&now); /* get current time; same as: now = time(NULL) */
newyear = *localtime(&now);
newyear.tm_hour = 0;
newyear.tm_min = 0;
newyear.tm_sec = 0;
newyear.tm_mon = 11; // Styczen=0, Luty=1 itd.
newyear.tm_mday = 31;
int days = (int)difftime(mktime(&newyear),now) / (3600 * 24);
std::cout << days << " Dni do konca roku.\n";
return 0;
}