#include<iostream>
using namespace std;
struct Date
{
	int y;//year
	int m;//month
	int d;//day in month
};
bool isLeap(int y)//判斷是否是閏年
{
	return y%4==0&&y%100!=0||y%400==0;//真返回為1，假為0
}
int daysOfMonth(int y,int m)
{
	int day[12]={31,28,31,30,31,30,31,31,30,31,30,31};
	if(m!=2)
		return day[m-1];
	else 
		return 28+isLeap(y);
}
int daysOfDate(Date d)//計算一共的天數
{
	int days=d.d;
	for(int y=1;y<d.y;y++)//計算年
		days+=365+isLeap(y);
	for(int m=1;m<d.m;m++)//計算月
		days+=daysOfMonth(d.y,m);
	//days+=d.d;
	return days;
}
int main()
{
	Date d1,d2;
	cout<<"intput 2 dates(yyyy mm dd):";
	cin>>d1.y>>d1.m>>d1.d;
	cin>>d2.y>>d2.m>>d2.d;
	int days1=daysOfDate(d1);
	int days2=daysOfDate(d2);
	cout<<"difference:"<<days2-days1<<endl;
	cout<<"weekday"<<days1%7<<"\t"<<days2%7<<endl;
	return 0;
}