A weekday calculator I made.

weekday_calculator

#include <iostream>
using namespace std;
char Continue;

int main()
{
	int Month, Day, Year, Weekday, DayNum;
	cout<<"Enter a date like this MM/DD/YYYYY: ";
	cin>>Month;cin.ignore();cin>>Day;cin.ignore();cin>>Year;cin>>Year;cin.ignore();
	cout<<endl;
	
	if (Year % 4 == 0)
	{
		switch (Month)
		{
		case 1: DayNum =  0 + Day;break;
		case 2: DayNum =  31 + Day;break;
		case 3: DayNum =  60 + Day;break;
		case 4: DayNum =  91 + Day;break;
		case 5: DayNum =  121 + Day;break;
		case 6: DayNum =  151 + Day;break;
		case 7: DayNum =  182 + Day;break;
		case 8: DayNum =  213 + Day;break;
		case 9: DayNum =  244 + Day;break;
		case 10: DayNum =  274 + Day;break;
		case 11: DayNum =  304 + Day;break;
		case 12: DayNum =  335 + Day;break;
		}
	}
	else 
	{
		switch (Month)
		{
		case 1: DayNum =  0 + Day;break;
		case 2: DayNum =  31 + Day;break;
		case 3: DayNum =  59 + Day;break;
		case 4: DayNum =  90 + Day;break;
		case 5: DayNum =  120 + Day;break;
		case 6: DayNum =  150 + Day;break;
		case 7: DayNum =  181 + Day;break;
		case 8: DayNum =  212 + Day;break;
		case 9: DayNum =  243 + Day;break;
		case 10: DayNum =  273 + Day;break;
		case 11: DayNum =  303 + Day;break;
		case 12: DayNum =  334 + Day;break;
		}
	}
	
	cout<<"That day was day number "<<DayNum<<" of that year and ";

	Day = Day % 7;
	
	switch (Month)
	{
	case 1: Month = 6;break;
	case 2: Month = 2;break;
	case 3: Month = 2;break;
	case 4: Month = 5;break;
	case 5: Month = 0;break;
	case 6: Month = 3;break;
	case 7: Month = 5;break;
	case 8: Month = 1;break;
	case 9: Month = 4;break;
	case 10: Month = 6;break;
	case 11: Month = 2;break;
	case 12: Month = 4;break;
	}
		
	if (Year > 1999)
	{
		Year -= 2000;
	}
	else
	{
		Year -= 1899;
	}
	
	Year %= 28;

	switch (Year)
	{
	case 0: Year = 0;break;
	case 1: Year = 1;break;
	case 2: Year = 2;break;
	case 3: Year = 3;break;
	case 4: Year = 5;break;
	case 5: Year = 6;break;
	case 6: Year = 0;break;
	case 7: Year = 1;break;
	case 8: Year = 3;break;
	case 9: Year = 4;break;
	case 10: Year = 5;break;
	case 11: Year = 6;break;
	case 12: Year = 1;break;
	case 13: Year = 2;break;
	case 14: Year = 3;break;
	case 15: Year = 4;break;
	case 16: Year = 6;break;
	case 17: Year = 0;break;
	case 18: Year = 1;break;
	case 19: Year = 2;break;
	case 20: Year = 4;break;
	case 21: Year = 5;break;
	case 22: Year = 6;break;
	case 23: Year = 0;break;
	case 24: Year = 2;break;
	case 25: Year = 3;break;
	case 26: Year = 4;break;
	case 27: Year = 5;break;
	case 28: Year = 0;break;
	}

			
	Weekday = (Month + Day + Year) % 7;

	
	switch (Weekday)
	{
	case 0: cout<<"it was a Sunday!\n";break;
	case 1: cout<<"it was a Monday!\n";break;
	case 2: cout<<"it was a Tuesday!\n";break;
	case 3: cout<<"it was a Wednesday!\n";break;
	case 4: cout<<"it was a Thursday!\n";break;
	case 5: cout<<"it was a Friday!\n";break;
	case 6: cout<<"it was a Saturday!\n";break;
	}

	

	system ("pause");
	return 0;
}