C++ : overloading insertion and extraction operator

#include<iostream>
#include<conio.h>

using namespace std;

class time1
{
private:
int hrs;
int mins;

public:
time1():hrs(0),mins(0){}
time1(int h, int m):hrs(h),mins(m){}
friend istream & operator >> (istream &tin, time1 &t);
friend ostream & operator << (ostream &tout, time1 &t);
};

istream & operator >>(istream &tin, time1 &t)
{
tin>>t.hrs;
tin>>t.mins;
return tin;
}

ostream & operator << (ostream &tout, time1 &t)
{
tout<<t.hrs<<" : "<<t.mins<<endl;
return tout;
}



int main()
{
time1 t1;
cout<<"Enter time t1 : ";cin>>t1;
cout<<"Time t1 = "<<t1;
time1 t2(11,23);
cout<<"Time t2 is "<<t2;
getch();
return(0);
}