#include <iostream>
using namespace std;
struct date
{
 int yy,mm,dd;
};
struct date get_date();
int main ()
{
 struct date time;
 time=get_date();
 cout <<time<<endl;
}
struct date get_date()
{
 struct date tim;
 cout <<"Enter the time:";
 cin >>tim;
 return tim;
}

是不是这样改？          :
cout <<time.yy<<time.mm<<time.dd<<endl;
          :
cin >>tim.yy>>tim.mm>>tim.dd;