C++ Tarih programı

struct datetime gunSonraTarihNe(struct datetime dt,int gun)  {       struct datetime iterator;       iterator=dt;       while(gun>0)       {            subat_Kontrol(iterator);            gun--;            if(iterator.day==aylar[iterator.month-1])            {                 iterator.day=1;                 if(iterator.month==12)                 {                           iterator.month=1;                      iterator.year++;                 }                 else                      iterator.month++;            }            else if(iterator.day<aylar[iterator.month-1])                 iterator.day++;            }       return iterator;  }