Difference of days between two dates in C++ program

This is how you can find the number of days between two dates using c++ program in visual studio.
Dates can be anything like 13-01-2016 to 21-05-2017...

#include <iostream>                        

using namespace std;                       

int main() {                               

  int d1,m1,y1,d2,m2,y2;                     

  cout << " enter day1" <<endl;

  cin>>d1;

  cout << " enter m1" <<endl;

  cin>>m1;

  cout << " enter y1" <<endl;

  cin>>y1;

  cout << " enter d2" <<endl;

  cin>>d2;

  cout << " enter m2" <<endl;

  cin>>m2;

  cout << " enter y2" <<endl;

  cin>>y2;

  //now find difference

  int days,months,years;

days=d2-d1;

months=m2-m1;

years=y2-y1;

//converting into days

  int mdays,ydays;

  mdays=months*30;

  ydays=years*365;

  //total

  int total;

total=days+mdays+ydays;

  cout <<" total days = "<< total <<endl;

  

system ("pause");

return 0;

}