DateTime.h

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#ifndef DATE_TIME_H
#define DATE_TIME_H

#include <ctime>

const int NUM_LAST_DAYS = 7;
const int NUM_LAST_WEEKS = 52;
const int DAYS_IN_YEAR = 366; // maximum (leap years)
const int HOURS_IN_DAY = 24;
const int DAYS_IN_WEEK = 7;
const int MONTHS_IN_YEAR = 12;

CString DayInYearToString( int iDayInYearIndex );
CString LastDayToString( int iLastDayIndex );
CString DayOfWeekToString( int iDayOfWeekIndex );
CString HourInDayToString( int iHourIndex );
CString MonthToString( int iMonthIndex );
CString LastWeekToString( int iLastWeekIndex );

tm AddDays( tm start, int iDaysToMove );
tm GetYesterday( tm start );
int GetDayOfWeek( tm time );
tm GetNextSunday( tm start );

tm GetDayInYearAndYear( int iDayInYearIndex, int iYear );


struct DateTime 
{
    int tm_sec;     /* seconds after the minute - [0,59] */
    int tm_min;     /* minutes after the hour - [0,59] */
    int tm_hour;    /* hours since midnight - [0,23] */
    int tm_mday;    /* day of the month - [1,31] */
    int tm_mon;     /* months since January - [0,11] */
    int tm_year;    /* years since 1900 */

        DateTime();
        void Init();

        bool operator<( const DateTime& other ) const
        {
        #define COMPARE( v ) if(v<other.v) return true; if(v>other.v) return false;
                COMPARE( tm_year );
                COMPARE( tm_mon );
                COMPARE( tm_mday );
                COMPARE( tm_hour );
                COMPARE( tm_min );
                COMPARE( tm_sec );
        #undef COMPARE
                // they're equal
                return false;
        }
        bool operator==( const DateTime& other ) const 
        {
#define COMPARE(x)      if( x!=other.x )        return false;
                COMPARE( tm_year );
                COMPARE( tm_mon );
                COMPARE( tm_mday );
                COMPARE( tm_hour );
                COMPARE( tm_min );
                COMPARE( tm_sec );
#undef COMPARE
                return true;
        }
        bool operator!=( const DateTime& other ) const { return !operator==(other); }

        static DateTime GetNowDateTime();
        static DateTime GetNowDate();   // GetNowDateTime() with time chopped off
        
        void StripTime();

        CString GetString() const;
        bool FromString( const CString sDateTime );
};


#endif

/*
 * (c) 2001-2004 Chris Danford
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons to
 * whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
 * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
 * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
 * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

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