///////////////////////////////////////////////////////////
// Softwarebauelemente II, Aufgabe O2.1
//
// author:			Stephan Brumme
// last changes:	February 26, 2001

#if !defined(AFX_DATE_H__A8EA7861_08E1_11D5_9BB7_A8652B9FDD20__INCLUDED_)
#define AFX_DATE_H__A8EA7861_08E1_11D5_9BB7_A8652B9FDD20__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000


// for basic class behaviour
#include "BasicClass.h"


///////////////////////////////////////////////////////////
// the CDate class is based upon the Gregorian calender
// it DOES work for year between ca. 1600 and <2^31
// no year validation is performed
//
// general order of parameters: dd/mm/yyyy

class CDate : public CBasicClass
{
public:
	// constructor, default value is 0/0/00 (invalid date !)
	CDate(int nDay=0, int nMonth=0, int nYear=0);

	// show attributes
	friend ostream& operator<<(ostream &mystream, const CDate& date);
	// return class name
	static char* ClassnameOf() { return "CDate"; }

	// return current date
	static CDate GetToday();

	// validate a date
	bool IsValid() const;
	// determine whether it is a leap year
	static bool IsLeapYear(int nYear);

	// copy constructors
	// non virtual
	CDate& operator = (const CDate &date);
	// virtual
	virtual bool Copy (const CDate *date);

	// compare two dates
	// non virtual
	bool operator ==(const CDate &date) const;
	// virtual
	virtual bool EqualValue(CDate *date) const;

	
	// set attributes, returns validility of date
	bool SetDay  (int nDay);
	bool SetMonth(int nMonth);
	bool SetYear (int nYear);

	// return attributes
	int  GetDay  () const;
	int  GetMonth() const;
	int  GetYear () const;

	// constants for month names'
	enum { JANUARY   = 1, FEBRUARY = 2, MARCH    = 3, APRIL    = 4,
		   MAY       = 5, JUNE     = 6, JULY     = 7, AUGUST   = 8,
		   SEPTEMBER = 9, OCTOBER  =10, NOVEMBER =11, DECEMBER =12 };

protected:
	// used to perform proper display in derived classes
	virtual ostream& OutStream(ostream& mystream, bool bDebug=false) const;

private:
	// attributes
	int m_nDay;
	int m_nMonth;
	int m_nYear;
};


#endif // !defined(AFX_DATE_H__A8EA7861_08E1_11D5_9BB7_A8652B9FDD20__INCLUDED_)