Date Class Reference

#include <DateTime.h>

Public Member Functions
	Date ()
	Date (const Date &_src)
	Date (int _year, int _month, int _day)
void	assign (int _year, int _month, int _day)
	Date (long _days)
void	assign (long _days)
long	days () const
const Date &	operator++ ()
const Date	operator++ (int)
const Date &	operator-- ()
const Date	operator-- (int)
const Date &	operator= (const Date &_src)
const Date &	operator+= (long _days)
const Date &	operator-= (long _days)
void	decode (int &_year, int &_month, int &_day) const
int	year () const
int	month () const
int	day () const
int	dayOfWeek () const
int	dayOfYear () const
int	daysInMonth () const
int	daysInYear () const
String	toString () const
String	toStringF (const wchar_t *_format=NULL) const

Static Public Member Functions
static bool	isValid (int y, int m, int d)
static bool	isLeapYear (int _year)

Static Public Attributes
static const wchar_t *	FORMAT_STRING = L"%Y-%m-%d"

Static Protected Member Functions
static long	convertGregorianToJulian (int _year, int _month, int _day)
static void	convertJulianToGregorian (long uJulianDays, int &_year, int &_month, int &_day)

Protected Attributes
long	__jday

Detailed Description

Definition at line 24 of file DateTime.h.

Constructor & Destructor Documentation

Date() [1/4]

__DCL_BEGIN_NAMESPACE Date::Date

(

)

Definition at line 29 of file DateTime.cpp.

{
    __jday = 0;
}

Date() [2/4]

Date::Date

(

const Date &

_src

)

Definition at line 34 of file DateTime.cpp.

{
    __jday = _src.__jday;
}

Date() [3/4]

Date::Date	(	int	_year,
		int	_month,
		int	_day )

Definition at line 39 of file DateTime.cpp.

{
    assign(_year, _month, _day);
}

Date() [4/4]

Date::Date

(

long

_days

)

Definition at line 44 of file DateTime.cpp.

{
    assign(_days);
}

Member Function Documentation

assign() [1/2]

void Date::assign	(	int	_year,
		int	_month,
		int	_day )

Definition at line 49 of file DateTime.cpp.

{
    __DCL_ASSERT(Date::isValid(_year, _month, _day));
 
    __jday = convertGregorianToJulian(
            _year,
            _month,
            _day
            );
}

assign() [2/2]

void Date::assign

(

long

_days

)

Definition at line 63 of file DateTime.cpp.

{
    if (_days < 0)
        __jday = _days + BC_END + 1;
    else if (_days > 0)
        __jday = _days + AD_START - 1;
    else
        // set NULL date
        __jday = _days;
}

convertGregorianToJulian()

long Date::convertGregorianToJulian ( int _year, int _month, int _day )

staticprotected

Definition at line 285 of file DateTime.cpp.

{
    if (_y == 0) {
        __DCL_ASSERT(_m == 0 && _d == 0);
        return 0;
    }
 
    _y += 600000;
 
    int c, ya;
    if (_m > 2)
         _m -= 3;
    else {
        _m += 9;
        _y--;
    }
    c = _y / 100;
    ya = _y - 100 * c;
 
    return (146097 * c) / 4
            + (1461 * ya) / 4
            + (153 * _m + 2) / 5
            + _d
            + 1721119;
}

convertJulianToGregorian()

void Date::convertJulianToGregorian ( long uJulianDays, int & _year, int & _month, int & _day )

staticprotected

Definition at line 313 of file DateTime.cpp.

{
    if (_j == 0) {
        _y = 0;
        _m = 0;
        _d = 0;
    }
    else {
        _j -= 1721119;
 
        _y = (4 * _j - 1) / 146097;
        _j = 4 * _j - 1 - 146097 * _y;
        _d = _j / 4;
 
        _j = (4 * _d + 3) / 1461;
        _d = 4 * _d + 3 - 1461 * _j;
        _d = (_d + 4) / 4;
 
        _m = (5 * _d - 3) / 153;
        _d = 5 * _d - 3 - 153 * _m;
        _d = (_d + 5 ) / 5;
 
        _y = 100 * _y + _j;
        if (_m < 10)
            _m += 3;
        else {
            _m -= 9;
            _y++;
        }
 
        _y -= 600000;
    }
}

day()

int Date::day

(

)

const

Definition at line 204 of file DateTime.cpp.

{
    int year, month, day;
    convertJulianToGregorian(__jday, year, month, day);
    return day;
}

dayOfWeek()

int Date::dayOfWeek

(

)

const

Definition at line 211 of file DateTime.cpp.

{
    return (((__jday + 1) % 7) + 7) % 7 + 1;
}

dayOfYear()

int Date::dayOfYear

(

)

const

Definition at line 216 of file DateTime.cpp.

{
    return __jday - convertGregorianToJulian(year(), 1, 1) + 1;
}

days()

long Date::days

(

)

const

Definition at line 74 of file DateTime.cpp.

{
    if (__jday <= BC_END)
        return __jday - BC_END - 1;
    else if (__jday >= AD_START)
        return __jday - AD_START + 1;
    else {
        __DCL_ASSERT(__jday == 0);
        return __jday;
    }
}

daysInMonth()

int Date::daysInMonth

(

)

const

Definition at line 227 of file DateTime.cpp.

{
    int year, month, day;
    convertJulianToGregorian(__jday, year, month, day);
    if (month == 2 && isLeapYear(year))
        return 29;
 
    return __monthDays__[month];
}

daysInYear()

int Date::daysInYear

(

)

const

Definition at line 237 of file DateTime.cpp.

{
    int year, month, day;
    convertJulianToGregorian(__jday, year, month, day);
 
    if (isLeapYear(year))
        return 366;
    return 365;
}

decode()

void Date::decode	(	int &	_year,
		int &	_month,
		int &	_day ) const

Definition at line 185 of file DateTime.cpp.

{
    convertJulianToGregorian(__jday, _year, _month, _day);
}

isLeapYear()

bool Date::isLeapYear ( int _year )

static

Definition at line 370 of file DateTime.cpp.

{
    return (_y % 4 == 0 && _y % 100 != 0) || _y % 400 == 0;
}

isValid()

bool Date::isValid ( int y, int m, int d )

static

Definition at line 350 of file DateTime.cpp.

{
    if (_y == 0) {
        // null date
        if (_m == 0 && _d == 0)
            return true;
    }
    else {
        if ((-9999 <= _y && _y <= 9999) &&
                (0 < _m && _m <= 12)
                && (0 < _d)) {
            if (_m == 2 && _d == 29)
                return Date::isLeapYear(_y);
            else
                return _d <= __monthDays__[_m];
        }
    }
    return false;
}

month()

int Date::month

(

)

const

Definition at line 197 of file DateTime.cpp.

{
    int year, month, day;
    convertJulianToGregorian(__jday, year, month, day);
    return month;
}

operator++() [1/2]

const Date & Date::operator++

(

)

Definition at line 86 of file DateTime.cpp.

{
    __DCL_ASSERT(__jday != 0);
 
    if (__jday == BC_END)
        __jday = AD_START;
    else
        __jday++;
 
    return *this;
}

operator++() [2/2]

const Date Date::operator++

(

int

)

Definition at line 98 of file DateTime.cpp.

{
    __DCL_ASSERT(__jday != 0);
 
    Date r = *this;
 
    if (__jday == BC_END)
        __jday = AD_START;
    else
        __jday++;
 
    return r;
}

operator+=()

const Date & Date::operator+=

(

long

_days

)

Definition at line 144 of file DateTime.cpp.

{
    __DCL_ASSERT(__jday != 0);
 
    if (__jday <= BC_END) {
        __jday += _days - BC_END;
 
        if (__jday <= 0)
            __jday += BC_END;
        else
            __jday += AD_START - 1;
    }
    else {
        __DCL_ASSERT(__jday >= AD_START);
        
        __jday += _days - AD_START;
 
        if (__jday >= 0)
            __jday += AD_START;
        else
            __jday += BC_END + 1;
    }
 
 
    return *this;
}

operator--() [1/2]

const Date & Date::operator--

(

)

Definition at line 112 of file DateTime.cpp.

{
    __DCL_ASSERT(__jday != 0);
 
    if (__jday == AD_START)
        __jday = BC_END;
    else
        __jday--;
 
    return *this;
}

operator--() [2/2]

const Date Date::operator--

(

int

)

Definition at line 124 of file DateTime.cpp.

{
    __DCL_ASSERT(__jday != 0);
 
    Date r = *this;
 
    if (__jday == AD_START)
        __jday = BC_END;
    else
        __jday--;
 
    return r;
}

operator-=()

const Date & Date::operator-=

(

long

_days

)

Definition at line 171 of file DateTime.cpp.

{
    __DCL_ASSERT(__jday != 0);
 
    return operator += (-_days);
}

operator=()

const Date & Date::operator=

(

const Date &

_src

)

Definition at line 138 of file DateTime.cpp.

{
    __jday = _src.__jday;
    return *this;
}

toString()

String Date::toString

(

)

const

Definition at line 247 of file DateTime.cpp.

{
    int year, month, day;
    decode(year, month, day);
    return String::format(L"%04d-%02d-%02d", year, month, day);
}

toStringF()

String Date::toStringF

(

const wchar_t *

_format = NULL

)

const

Definition at line 256 of file DateTime.cpp.

{
    if (!_format)
        _format = FORMAT_STRING;
 
    __DCL_ASSERT(*_format != L'\0');
 
    int year, month, day;
    decode(year, month, day);
 
    struct tm _time;
    memset(&_time, 0, sizeof(struct tm));
    _time.tm_year = year - 1900;
    _time.tm_mon = month - 1;
    _time.tm_mday = day;
    _time.tm_isdst = -1;
 
    CharBuffer* buf = CharBuffer::create(DATETIME_FORMAT_BUFFER_SIZE);
    size_t n = wcsftime(buf->data(), DATETIME_FORMAT_BUFFER_SIZE, _format, &_time);
    __DCL_ASSERT(buf->__allocLength >= n);
    buf->__dataLength = n;
 
    String r = buf;
    buf->release();
    return r;
}

year()

int Date::year

(

)

const

Definition at line 190 of file DateTime.cpp.

{
    int year, month, day;
    convertJulianToGregorian(__jday, year, month, day);
    return year;
}

Member Data Documentation

__jday

long Date::__jday

protected

Definition at line 77 of file DateTime.h.

FORMAT_STRING

const wchar_t * Date::FORMAT_STRING = L"%Y-%m-%d"

static

Definition at line 66 of file DateTime.h.

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The documentation for this class was generated from the following files:

• DateTime.h
• DateTime.cpp