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Date Class Assignment!

hookster007 (55)
So I have an assignment to make a program that calculates the today's date. It also has to calculate tomorrow's and yesterday's. I have the bulk of the program written correctly I think, I just can't figure out how on earth to write the yesterday and tomorrow methods. Can you guys give me something to start out with or any tips or help? Thank you!

Here is the date header file

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 #pragma once
#include <iostream>
#include <string>
using namespace std;

class Date
{
public: // access specifiers interface is designed here
	Date(int=1,int=1,int=1900); // default constructor

	void print_date() const; // method to print the date 
	void print_military_date(); // i.e. 4-January-2016 or 4-Jan-16
	void print_full_date(); // i.e. Wednesday, March 16, 2016
	void yesterday();
	void tomorrow();

	~Date(void); // destructor
private:
	bool leapyear(int); // private method only used within the class
	int month, day, year, dow; // data members
	string day_string, month_string;
	void calc_dow();
	void get_day_of_week();
};


Here is the date.cpp

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#include "Date.h"
// implementation of the methods

Date::Date(int m, int d, int y)
{
	switch(m)
	{
	case 1: case 3: case 5: case 7: case 8: case 10: case 12:
		if((d <= 31) && (d > 0))
		{
			month = m;
			day = d;
			year = y;
			break;
		}
	case 4: case 6: case 9: case 11:
		if((d <= 30) && (d > 0))
		{
			month = m;
			day = d;
			year = y;
			break;
		}

	case 2: // February
		if((leapyear(y)) && (d <= 29 && d > 0))
		{
			month = m;
			day = d;
			year = y;
			break;
		}
		else if ((!(leapyear(y))) && (d <= 28) && (d > 0))
		{
			month = m;
			day = d;
			year = y;
			break;
		}
	default:
		cerr << "Invalid Date! ";
		month = m;
		day = d;
		year = y;
		print_date();
		break;
	} // end switch
}

void Date::print_date() const
{
	cout << month << "-" << day << "-" << year << endl;
}

void Date::print_military_date()
{
	// 4-January-2016


	string monthname;
	monthname = (month);

	if (month == 1)
		monthname = "January";
	if (month == 2)
		monthname = "February";
	if (month == 3)
		monthname = "March";
	if (month == 4)
		monthname = "April";
	if (month == 5)
		monthname = "May";
	if (month == 6)
		monthname = "June";
	if (month == 7)
		monthname = "July";
	if (month == 8)
		monthname = "August";
	if (month == 9)
		monthname = "September";
	if (month == 10)
		monthname = "October";
	if (month == 11)
		monthname = "November";
	if (month == 12)
		monthname = "December";
	
	cout << day << "-" << monthname << "-" << year;
}

void Date::print_full_date()
{

}

void Date::calc_dow()
{
	int m = month, d = day, y = year; //preserve orignal values
	dow = (d+=m<3?y--:y-2,23*m/9+d+4+y/4-y/100+y/400)%7;
	// dow is an integer value from 0 - 6, 0 = Sunday, 1 = Monday, etc...
}

void Date::get_day_of_week()
{
	if(dow == 0)
		day_string = "Sunday";
	else if (dow == 1)
		day_string = "Monday";
	else if (dow == 2)
		day_string = "Tuesday";
	else if (dow == 3)
		day_string = "Wednesday";
	else if (dow == 4)
		day_string = "Thursday";
	else if (dow == 5)
		day_string = "Friday";
	else
	     day_string = "Saturday";

}




void Date::yesterday()
{
	// HELP HERE
}





void Date::tomorrow()
{
	// HELP HERE 
}




bool Date::leapyear(int y)
{
	if(y % 100 == 0)
		return (y % 400 == 0);
	else
	    return (y % 4 == 0);
}

Date::~Date(void)
{
}

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