datetime.cpp

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bool DateTime::operator!= ( const DateTime& rhs ) const
{
	return time_ != rhs.time_;
}

DateTime& DateTime::operator =( const time_t& rhs )
{
	tm gm = *localtime( &rhs );

	set( gm.tm_year + 1900, gm.tm_mon+1, gm.tm_mday, gm.tm_hour, gm.tm_min, gm.tm_sec );

	return *this;
}

time_t DateTime::getCTime() const
{
	time_t result = 0;

	DateTime unixCtime( 1970, 1, 1 ) ;

	result = ((time_ - unixCtime.time_) / 1000);

	return result;
}

DateTime::DayTime DateTime::getDayTime() const
{
	DayTime result = DateTime::AM;
	result = getHour() >= 12 ? DateTime::PM : DateTime::AM;
	return result;
}

bool DateTime::isAM() const
{
	return getHour() < 12;
}

bool DateTime::isPM() const
{
	return getHour() >= 12;
}

bool DateTime::firstDayOfTheWeek() const
{
	return getWeekDay() == DateTime::Sun;
}

bool DateTime::lastDayOfTheWeek() const
{
	return getWeekDay() == DateTime::Sat;
}

bool DateTime::firstDayOfTheMonth() const
{
	return getDay() == 1;
}

bool DateTime::lastDayOfTheMonth() const
{
	return getDay() == getNumberOfDaysInMonth();
}

bool DateTime::firstDayOfTheYear() const
{
	return 1 == getDayOfYear();
}

bool DateTime::lastDayOfTheYear() const
{
	return getDayOfYear() == getDaysInYear();
}


DateTime DateTime::operator+( const DateTimeSpan& rhs ) const
{
	DateTime result = *this;

	result.time_ += rhs;

	return result;
}

DateTime DateTime::operator-( const DateTimeSpan& rhs ) const
{
	DateTime result = *this;

	result.time_ -= rhs;

	return result;
}

DateTimeSpan DateTime::operator-( const DateTime& rhs ) const
{
	DateTimeSpan result;

	if ( time_ > rhs.time_ ) {
		result.subtract( *this , rhs );
	}
	else {
		result.subtract( rhs, *this );
	}

	return result;
}

ulong64 DateTime::getMilliseconds() const
{
	return time_;
}


void DateTime::setMilliseconds( const ulong64& milliseconds )
{
	time_ = milliseconds;
}

unsigned long DateTime::getWeekOfYearStartingMon() const
{
	//based on ISO 8601
	//code shamelessly swiped from http://www.merlyn.demon.co.uk/weekinfo.htm
	// J R Stockton, any problems are my fault
	unsigned long result = 0;

	DateTime dt(*this);

	int day = dt.getWeekDay();
	if ( day == 0 ) {
		day = 7;
	}
	int month = dt.getMonth();

	int d = dt.getDay() + (4 - day);

	int maxDays = dt.getNumberOfDaysInMonth();

	if ( (d < 1) && (month==1) ) {
		//use week of prev year
		dt.decrYear();
		result = dt.getWeeksInYear();
	}
	else {
		dt.set( dt.getYear(), month, maxVal<>(1, minVal<>(maxDays,d)) ) ;//max( 1, dt.getDay() + 4 - day ) );

		result = (unsigned long) floor(static_cast<float>((dt.getDayOfYear()-1) / 7 )) + 1;
	}

	return result;
}

unsigned long DateTime::getWeekOfYearStartingSun() const
{
	//based on ISO 8601
	//code shamelessly swiped from http://www.merlyn.demon.co.uk/weekinfo.htm
	// J R Stockton, any problems are my fault
	unsigned long result = 0;

	DateTime dt(*this);

	int day = dt.getWeekDay() + 1;
	int month = dt.getMonth();

	int d = dt.getDay() + (4 - day);

	int maxDays = dt.getNumberOfDaysInMonth();

	if ( (d < 1) && (month==1) ) {
		//use week of prev year
		dt.decrYear();
		result = dt.getWeeksInYear();
	}
	else {
		dt.set( dt.getYear(), month, maxVal<>(1, minVal<>(maxDays,d)) ) ;//max( 1, dt.getDay() + 4 - day ) );

		result = (unsigned long) floor(static_cast<float>((dt.getDayOfYear()-1) / 7 )) + 1;
	}

	return result;
}

unsigned long DateTime::getWeeksInYear() const
{
	return (unsigned long) floor(static_cast<float>(getDaysInYear() / 7) ) + 1;
}

String DateTime::toString()
{
	return StringUtils::format( *this, TOSTRING_FORMAT );
}

void DateTime::loadFromStream( InputStream* stream )
{
	long hi = 0;
	long lo = 0;

	stream->read( hi );
	stream->read( lo );


	time_.lo( (unsigned long)lo );
	time_.hi( (unsigned long)hi );
}

void DateTime::saveToStream( OutputStream* stream )
{
	long hi = time_.hi();
	long lo = time_.lo();

	stream->write( hi );
	stream->write( lo );
}



void ByMillisecond::incr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() + offset );
}

void ByMillisecond::decr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() - offset );
}

void BySecond::incr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() + (offset * DateTime::ONESECOND) );
}

void BySecond::decr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() - (offset * DateTime::ONESECOND) );
}

void ByMinute::incr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() + (offset * DateTime::ONEMINUTE) );
}

void ByMinute::decr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() - (offset * DateTime::ONEMINUTE) );
}

void ByHour::incr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() + (offset * DateTime::ONEHOUR) );
}

void ByHour::decr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() - (offset * DateTime::ONEHOUR) );
}

void ByDay::incr( DateTime& dt, unsigned long offset )
{
	ulong64 offset64 = offset * DateTime::ONEDAY;
	dt.setMilliseconds( dt.getMilliseconds() + offset64 );
}

void ByDay::decr( DateTime& dt, unsigned long offset )
{
	dt.setMilliseconds( dt.getMilliseconds() - (offset * DateTime::ONEDAY) );
}

void ByMonth::incr( DateTime& dt, unsigned long offset )
{
	long y = dt.getYear();
	long m = dt.getMonth();
	long d = dt.getDay();

	int origMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	if ( (m + offset) > 12 ) {
		y += (m + offset) / 12;

		m = (m + offset) % 12;
	}
	else {
		m += offset;
	}

	int newMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	if ( newMaxDaysInMon != origMaxDaysInMon ) {
		//check to see if we need to move the day around
		if ( d == origMaxDaysInMon ) {
			//last day of the month
			d = newMaxDaysInMon;
		}
		else if ( d > 28 ) {
			//make it smaller
			d = minVal<int>( d, newMaxDaysInMon );
		}
	}



	dt.set( y, m, d, dt.getHour(), dt.getMinute(), dt.getSecond(), dt.getMillisecond() );
}

void ByMonth::decr( DateTime& dt, unsigned long offset )
{
	long y = dt.getYear();
	long m = dt.getMonth();
	long d = dt.getDay();

	int origMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	if ( (m - offset) < 1 ) {

		y -= ( abs((long)static_cast<float>( m - offset ) ) / 12) + 1;

		m = 12 - ((m - offset) % 12);
	}
	else {
		m -= offset;
	}

	int newMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	if ( newMaxDaysInMon != origMaxDaysInMon ) {
		//check to see if we need to move the day around
		if ( d == origMaxDaysInMon ) {
			//last day of the month
			d = newMaxDaysInMon;
		}
		else if ( d > 28 ) {
			//make it smaller
			d = minVal<int>( d, newMaxDaysInMon );
		}
	}

	dt.set( y, m, d, dt.getHour(), dt.getMinute(), dt.getSecond(), dt.getMillisecond() );
}

void ByYear::incr( DateTime& dt, unsigned long offset )
{
	long y = dt.getYear();
	long m = dt.getMonth();
	long d = dt.getDay();

	int origMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	y += offset;

	int newMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	if ( newMaxDaysInMon != origMaxDaysInMon ) {
		//check to see if we need to move the day around
		if ( d == origMaxDaysInMon ) {
			//last day of the month
			d = newMaxDaysInMon;
		}
		else if ( d > 28 ) {
			//make it smaller
			d = minVal<int>( d, newMaxDaysInMon );
		}
	}

	dt.set( y, m, d, dt.getHour(), dt.getMinute(), dt.getSecond(), dt.getMillisecond() );
}

void ByYear::decr( DateTime& dt, unsigned long offset )
{
	long y = dt.getYear();
	long m = dt.getMonth();
	long d = dt.getDay();

	int origMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	y -= offset;

	int newMaxDaysInMon = DateTime::getNumberOfDaysInMonth( y, (DateTime::Months)m );

	if ( newMaxDaysInMon != origMaxDaysInMon ) {
		//check to see if we need to move the day around
		if ( d == origMaxDaysInMon ) {
			//last day of the month
			d = newMaxDaysInMon;
		}
		else if ( d > 28 ) {
			//make it smaller
			d = minVal<int>( d, newMaxDaysInMon );
		}
	}

	dt.set( y, m, d, dt.getHour(), dt.getMinute(), dt.getSecond(), dt.getMillisecond() );
}



///////////////////////////////////////////////////////////////////////////////
// DateTimeSpan implementation


void DateTimeSpan::subtract( const DateTime& lhs, const DateTime& rhs )
{
	start_ = rhs.time_;
	end_ = lhs.time_;
	delta_ = end_ - start_;

	DateTime::Iterator<ByMonth> monthIt = rhs;
	unsigned int ey = lhs.getYear();
	unsigned int em = lhs.getMonth();
	unsigned int sy = rhs.getYear();
	
	months_ = 0;
	while ( true ) {
		if ( (*monthIt).getYear() == ey ) {
			if ( (*monthIt).getMonth() == em ) {
				break;
			}
		}
		++months_;

		++monthIt;
	}

	years_ = abs(static_cast<int>(ey-sy));

	if ( years_ > 0 ) {
		if ( lhs > rhs ) {
			if ( lhs.getMonth() < rhs.getMonth() ) {
				years_ --;
			}
		}
		else {
			if ( rhs.getMonth() < lhs.getMonth() ) {
				years_ --;
			}
		}
	}

	days_ = delta_ / DateTime::ONEDAY;
}

unsigned long DateTimeSpan::getYears() const
{
	return years_;
}

unsigned long DateTimeSpan::getMonths() const
{
	return months_ % 12;
}

unsigned long DateTimeSpan::getDays() const
{

	unsigned long result = 0;


	DateTime end;
	end.time_ = end_;

	DateTime start;
	start.time_ = start_;

	result = abs((long)static_cast<float>(end.getDay() - start.getDay()));

	return result;
}

unsigned long DateTimeSpan::getHours() const
{
	DateTime dt;
	dt.time_ = delta_;

	return dt.getHour();
}

unsigned long DateTimeSpan::getMinutes() const
{
	DateTime dt;
	dt.time_ = delta_;

	return dt.getMinute();
}

unsigned long DateTimeSpan::getSeconds() const
{
	DateTime dt;
	dt.time_ = delta_;

	return dt.getSecond();
}

unsigned long DateTimeSpan::getMilliseconds() const
{
	DateTime dt;
	dt.time_ = delta_;

	return dt.getMillisecond();
}

unsigned long DateTimeSpan::getTotalMonths() const
{
	return months_;
}

unsigned long DateTimeSpan::getTotalDays() const
{
	return days_;
}

unsigned long DateTimeSpan::getTotalHours() const
{
	return delta_ / DateTime::ONEHOUR;
}

unsigned long DateTimeSpan::getTotalMinutes() const
{
	return delta_ / DateTime::ONEMINUTE;
}

unsigned long DateTimeSpan::getTotalSeconds() const
{
	return delta_ / DateTime::ONESECOND;
}

ulong64 DateTimeSpan::getTotalMilliseconds() const
{
	return delta_;
}




/**
*CVS Log info
*$Log$
*Revision 1.4  2006/04/07 02:35:34  ddiego
*initial checkin of merge from 0.6.9 dev branch.
*
*Revision 1.3.4.4  2006/03/06 14:42:55  kiklop74
*BDS 2006 fix
*
*Revision 1.3.4.3  2005/12/28 21:02:21  kiklop74
*Fixed ambiguity error when compiling with bcb6
*
*Revision 1.3.4.2  2005/11/10 02:02:38  ddiego
*updated the osx build so that it
*compiles again on xcode 1.5. this applies to the foundationkit and graphicskit.
*
*Revision 1.3.4.1  2005/11/10 00:03:48  obirsoy
*changes required for gcc under Linux.
*
*Revision 1.3  2004/12/01 04:31:40  ddiego
*merged over devmain-0-6-6 code. Marcello did a kick ass job
*of fixing a nasty bug (1074768VCF application slows down modal dialogs.)
*that he found. Many, many thanks for this Marcello.
*
*Revision 1.2.2.4  2004/08/26 04:05:47  marcelloptr
*minor change on name of getMillisecond
*
*Revision 1.2.2.3  2004/08/23 21:25:57  marcelloptr
*just moved some member definitions around
*
*Revision 1.2  2004/08/07 02:49:13  ddiego
*merged in the devmain-0-6-5 branch to stable
*
*Revision 1.1.2.6  2004/08/06 01:45:04  ddiego
*updated and added Marcellos DateTime changes.
*
*Revision 1.1.2.5  2004/08/03 20:57:22  marcelloptr
*minor change on name DateTime:getSecond DateTime:getMillisecond
*
*Revision 1.1.2.4  2004/07/30 17:28:40  kiklop74
*Added first release of Borland midifications for VCF
*
*Revision 1.1.2.3  2004/07/24 01:40:42  ddiego
*committed changes requested by Marcello. Got rid of the remaining
*date time members on the File class - now the dat time function call the
*FilePeer directly each time. Also added 2 functions to DateTime to convert
*directly to UTC or Local time.
*
*Revision 1.1.2.2  2004/04/29 04:07:07  marcelloptr
*reformatting of source files: macros and csvlog and copyright sections
*
*Revision 1.1.2.1  2004/04/28 03:29:39  ddiego
*migration towards new directory structure
*
*Revision 1.3.2.3  2004/04/26 16:43:34  ddiego
*checked in some minor fixes to some of the other
*libraries due to switch over to unicode
*
*Revision 1.3.2.2  2004/04/22 00:56:40  ddiego
*fixed GCC complaint about too large of
*an integer value in DateTime class
*
*Revision 1.3.2.1  2004/04/06 17:19:16  ddiego
*minor header changes to better facilitate compiling with
*mingw. Also some minor changes to the devcpp FoundationKit project.
*
*Revision 1.3  2004/02/16 20:38:17  ddiego
*applied patch from Bobby Ward for further fixes for VC71 compiling
*
*Revision 1.2  2004/01/20 01:54:56  ddiego
*merged some more changes from dev branch, primarily changes to
*teh RTTI API so that we now process enum sets correctly (i.e. a long
*that is a mask made of enum values).
*
*Revision 1.1.2.3  2004/01/17 18:47:31  ddiego
*added a new example for DateTime calss and some other minor fixes to it
*
*Revision 1.1.2.2  2004/01/17 06:09:50  ddiego
*integrated the DateTime class into the VCF FoundationKit.
*
*/