//	Assignment #3, Programming I, Summer 2005
//	Name:  Darius Juan Bloomer
 
 
#include <iostream>
#include <string>
#include <cmath>
 
using namespace std;
 
 
long julian ( int year, int month, int day );
 
int main()
{
	const long int julian_day = 2450000;
	int year = 0;
	int month = 0;
	int day = 0;
	int t_year = 0;
	int t_month = 0;
	int t_day = 0;
 
 
	cout << " Enter a year, month, day ( ex. 1323 11 30 or -1400 8 11): ";
	cin >> year;
	cin >> month;
	cin >> day;
	cout << endl << endl;
 
 
	long julian_date = julian( year, month, day);
 
	cout << julian_date << endl;
 
 
 
	cout << " What is today's date in the same format(ex. 2005 2 22): ";
	cin >> t_year;
	cin >> t_month;
	cin >> t_day;
 
 
	long today_date = julian( t_year, t_month, t_day);
	long difference = today_date - julian_date;
 
	cout << difference << endl << endl;
 
	return 0;
}
 
 
 
	long julian ( int year, int month, int day)
	{
 
		int j_year = year;
		int j_month = month;
		int j_day = day;
 
		if ( j_year < 0)
 
			j_year += 1;
 
		if ( j_month > 2)
 
			j_month += 1;
 
		else
		{
			j_month += 13;
			j_year -= 1;
		}
 
		long jul =static_cast<long>(floor(365.25 * j_year) + floor(30.6001 * j_month) + j_day + 1720995.0);
 
 
	//	if  (j_year <= 1582) {
	//	if  (j_month <= 10) 
	//	if  ( j_day < 15 )  
 
		if ( j_year < 1582 || ( j_year == 1582 && (j_month < 10 || ( j_month == 10 && j_day < 15))))
			return jul;
 
 
		else
		{
			int ja = static_cast<int>(0.01 * j_year);
			jul +=  static_cast<int>(2 - ja + 0.25 * ja);
 
			return jul;
		}
 
	}