#include <ctime>
#include <iostream>
using std::cout;
using std::endl;

/*class date
{
public:
	date();
	~date();
}*/

void AlJan1970_to_DMY(int days,int &day,int &month,int &year){
	tm tm;
tm.tm_sec=0;
tm.tm_min=0;
tm.tm_hour=12;
tm.tm_mday=1+days;
tm.tm_mon=0;
tm.tm_year=70;
mktime(&tm);//規范化std：：tm表示
    day=tm.tm_mday;
    month=tm.tm_mon;
    year=tm.tm_year;
}

void DMY_to_AlJan1970(int day,int month,int year,int &days){
	tm tm;
tm.tm_sec=0;
tm.tm_min=0;
tm.tm_hour=12;
tm.tm_mday=day;
tm.tm_mon=1+month;
tm.tm_year=year-1900;
time_t seconds=mktime(&tm);
days=(seconds/86400)-1;
}

int main(){
	cout<<AlJan1970_to_DMY();

return 0;
}