/////////////////////////////////////////////////////////////////////////////
// Name:        date.h
// Purpose:     wxDate class
// Author:      Julian Smart, Steve Marcus, Eric Simon, Chris Hill,
//              Charles D. Price
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c)
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_DATE_H_
#define _WX_DATE_H_

#ifdef __GNUG__
#pragma interface "date.h"
#endif

#include "wx/object.h"
#include "wx/string.h"

#if wxUSE_TIMEDATE
// These lines necessary to stop VC++ 6 being confused about namespaces
class WXDLLEXPORT wxDate;
bool WXDLLEXPORT operator<(const wxDate &dt1, const wxDate &dt2);
bool WXDLLEXPORT operator<(const wxDate &dt1, const wxDate &dt2);
bool WXDLLEXPORT operator <= (const wxDate &dt1, const wxDate &dt2);
bool WXDLLEXPORT operator >  (const wxDate &dt1, const wxDate &dt2);
bool WXDLLEXPORT operator >= (const wxDate &dt1, const wxDate &dt2);
bool WXDLLEXPORT operator == (const wxDate &dt1, const wxDate &dt2);
bool WXDLLEXPORT operator != (const wxDate &dt1, const wxDate &dt2);

enum wxdate_format_type {wxMDY, wxDAY, wxMONTH, wxFULL, wxEUROPEAN};

#define wxNO_CENTURY  0x02
#define wxDATE_ABBR   0x04

class WXDLLEXPORT wxDate : public wxObject
{
DECLARE_DYNAMIC_CLASS(wxDate)

protected:
    unsigned long julian; // see julDate();  days since 1/1/4713 B.C.
    int month;            // see NMonth()
    int day;              // see Day()
    int year;             // see NYear4()
    int day_of_week;      // see NDOW();  1 = Sunday, ... 7 = Saturday

private:
    int       DisplayFormat;
    unsigned char DisplayOptions;

    void julian_to_mdy ();         // convert julian day to mdy
    void julian_to_wday ();        // convert julian day to day_of_week
    void mdy_to_julian ();         // convert mdy to julian day

public:
    wxDate ();
    wxDate (long j);
    wxDate (int m, int d, int y);
    wxDate (const wxString& dat);
    wxDate (const wxDate &dt);

#ifndef __SALFORDC__
    operator wxString  (void);
#endif

    void operator =   (const wxDate& date);
    void operator =   (const wxString& date);

    wxDate operator +  (long i);
    wxDate operator +  (int  i);

    wxDate operator -  (long i);
    wxDate operator -  (int  i);

    long operator -  (const wxDate &dt);

    wxDate &operator += (long i);
    wxDate &operator -= (long i);

    wxDate &operator ++ ();     // Prefix increment
    wxDate &operator ++ (int);  // Postfix increment
    wxDate &operator -- ();     // Prefix decrement
    wxDate &operator -- (int);  // Postfix decrement

    friend bool WXDLLEXPORT operator <  (const wxDate &dt1, const wxDate &dt2);
    friend bool WXDLLEXPORT operator <= (const wxDate &dt1, const wxDate &dt2);
    friend bool WXDLLEXPORT operator >  (const wxDate &dt1, const wxDate &dt2);
    friend bool WXDLLEXPORT operator >= (const wxDate &dt1, const wxDate &dt2);
    friend bool WXDLLEXPORT operator == (const wxDate &dt1, const wxDate &dt2);
    friend bool WXDLLEXPORT operator != (const wxDate &dt1, const wxDate &dt2);

    friend ostream WXDLLEXPORT & operator << (ostream &os, const wxDate &dt);

    wxString FormatDate      (int type=-1) const;
    void  SetFormat (int format);
    int   SetOption (int option, bool enable=TRUE);

    long  GetJulianDate() const;  // returns julian date
    int   GetDayOfYear()  const;  // returns relative date since Jan. 1
    bool  IsLeapYear()    const;  // returns TRUE if leap year, FALSE if not

    // Version 4.0 Extension to Public Interface - CDP

    // These 'Set's modify the date object and actually SET it
    // They all return a reference to self (*this)

    wxDate &Set();            // Sets to current system date
    wxDate &Set(long lJulian);
    wxDate &Set(int nMonth, int nDay, int nYear);

    wxDate &AddWeeks(int nCount = 1);  //
    wxDate &AddMonths(int nCount = 1); // May also pass neg# to decrement
    wxDate &AddYears(int nCount = 1);  //

    int   GetDay() const;      // Numeric Day of date object
    int   GetDaysInMonth();    // Number of days in month (1..31)
    int   GetFirstDayOfMonth() const; // First Day Of Month  (1..7)

    wxString GetDayOfWeekName();       // Character Day Of Week ('Sunday'..'Saturday')
    int   GetDayOfWeek() const;     // (1..7)

    int   GetWeekOfMonth();            // Numeric Week Of Month  (1..6)
    int   GetWeekOfYear();            // Numeric Week Of Year   (1..52)

    wxString GetMonthName();            // Character Month name
    int   GetMonth() const;          // Month Number (1..12)
    wxDate  GetMonthStart();         // First Date Of Month
    wxDate  GetMonthEnd();           // Last Date Of Month

    int   GetYear() const;           // eg. 1992
    wxDate  GetYearStart();          // First Date Of Year
    wxDate  GetYearEnd();            // Last Date Of Year

    bool IsBetween(const wxDate& first, const wxDate& second) const;

    wxDate Previous(int dayOfWeek) const;
};

#endif // wxUSE_TIMEDATE
#endif
    // _WX_DATE_H_