Date Class Reference

#include <DateTime.h>

Public Member Functions
	Date ()
	Date (const Date &src)
	Date (int nYear, int nMonth, int nDay)
void	assign (int nYear, int nMonth, int nDay)
	Date (long nDays)
void	assign (long nDays)
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 nDays)
const Date &	operator-= (long nDays)
void	decode (int &nYear, int &nMonth, int &nDay) 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 *pszFormat=NULL) const

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

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

Static Protected Member Functions
static long	convertGregorianToJulian (int nYear, int nMonth, int nDay)
static void	convertJulianToGregorian (long uJulianDays, int &nYear, int &nMonth, int &nDay)

Protected Attributes
long	m_nJDay

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.

{
    m_nJDay = 0;
}

Date() [2/4]

Date::Date

(

const Date &

src

)

Definition at line 34 of file DateTime.cpp.

{
    m_nJDay = src.m_nJDay;
}

Date() [3/4]

Date::Date	(	int	nYear,
		int	nMonth,
		int	nDay )

Definition at line 39 of file DateTime.cpp.

{
    assign(nYear, nMonth, nDay);
}

Date() [4/4]

Date::Date

(

long

nDays

)

Definition at line 44 of file DateTime.cpp.

{
    assign(nDays);
}

Member Function Documentation

assign() [1/2]

void Date::assign	(	int	nYear,
		int	nMonth,
		int	nDay )

Definition at line 49 of file DateTime.cpp.

{
    __DCL_ASSERT(Date::isValid(nYear, nMonth, nDay));
 
    m_nJDay = convertGregorianToJulian(
            nYear,
            nMonth,
            nDay
            );
}

assign() [2/2]

void Date::assign

(

long

nDays

)

Definition at line 63 of file DateTime.cpp.

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

convertGregorianToJulian()

long Date::convertGregorianToJulian ( int nYear, int nMonth, int nDay )

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 & nYear, int & nMonth, int & nDay )

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 nYear, nMonth, nDay;
    convertJulianToGregorian(m_nJDay, nYear, nMonth, nDay);
    return nDay;
}

dayOfWeek()

int Date::dayOfWeek

(

)

const

Definition at line 211 of file DateTime.cpp.

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

dayOfYear()

int Date::dayOfYear

(

)

const

Definition at line 216 of file DateTime.cpp.

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

days()

long Date::days

(

)

const

Definition at line 74 of file DateTime.cpp.

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

daysInMonth()

int Date::daysInMonth

(

)

const

Definition at line 227 of file DateTime.cpp.

{
    int nYear, nMonth, nDay;
    convertJulianToGregorian(m_nJDay, nYear, nMonth, nDay);
    if (nMonth == 2 && isLeapYear(nYear))
        return 29;
 
    return monthDays[nMonth];
}

daysInYear()

int Date::daysInYear

(

)

const

Definition at line 237 of file DateTime.cpp.

{
    int nYear, nMonth, nDay;
    convertJulianToGregorian(m_nJDay, nYear, nMonth, nDay);
 
    if (isLeapYear(nYear))
        return 366;
    return 365;
}

decode()

void Date::decode	(	int &	nYear,
		int &	nMonth,
		int &	nDay ) const

Definition at line 185 of file DateTime.cpp.

{
    convertJulianToGregorian(m_nJDay, nYear, nMonth, nDay);
}

isLeapYear()

bool Date::isLeapYear ( int nYear )

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 nYear, nMonth, nDay;
    convertJulianToGregorian(m_nJDay, nYear, nMonth, nDay);
    return nMonth;
}

operator++() [1/2]

const Date & Date::operator++

(

)

Definition at line 86 of file DateTime.cpp.

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

operator++() [2/2]

const Date Date::operator++

(

int

)

Definition at line 98 of file DateTime.cpp.

{
    __DCL_ASSERT(m_nJDay != 0);
 
    Date dSave = m_nJDay;
 
    if (m_nJDay == BC_END)
        m_nJDay = AD_START;
    else
        m_nJDay++;
 
    return dSave;
}

operator+=()

const Date & Date::operator+=

(

long

nDays

)

Definition at line 144 of file DateTime.cpp.

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

operator--() [1/2]

const Date & Date::operator--

(

)

Definition at line 112 of file DateTime.cpp.

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

operator--() [2/2]

const Date Date::operator--

(

int

)

Definition at line 124 of file DateTime.cpp.

{
    __DCL_ASSERT(m_nJDay != 0);
 
    Date dSave = m_nJDay;
 
    if (m_nJDay == AD_START)
        m_nJDay = BC_END;
    else
        m_nJDay--;
 
    return dSave;
}

operator-=()

const Date & Date::operator-=

(

long

nDays

)

Definition at line 171 of file DateTime.cpp.

{
    __DCL_ASSERT(m_nJDay != 0);
 
    return operator += (-nDays);
}

operator=()

const Date & Date::operator=

(

const Date &

src

)

Definition at line 138 of file DateTime.cpp.

{
    m_nJDay = src.m_nJDay;
    return *this;
}

toString()

String Date::toString

(

)

const

Definition at line 247 of file DateTime.cpp.

{
    int nYear, nMonth, nDay;
    decode(nYear, nMonth, nDay);
    return String::format(L"%04d-%02d-%02d", nYear, nMonth, nDay);
}

toStringF()

String Date::toStringF

(

const wchar_t *

pszFormat = NULL

)

const

Definition at line 256 of file DateTime.cpp.

{
    if (!pszFormat)
        pszFormat = FORMAT_STRING;
 
    __DCL_ASSERT(*pszFormat != L'\0');
 
    int nYear, nMonth, nDay;
    decode(nYear, nMonth, nDay);
 
    struct tm t;
    memset(&t, 0, sizeof(struct tm));
    t.tm_year = nYear - 1900;
    t.tm_mon = nMonth - 1;
    t.tm_mday = nDay;
    t.tm_isdst = -1;
 
    CharBuffer* buf = CharBuffer::create(DATETIME_FORMAT_BUFFER_SIZE);
    size_t n = wcsftime(buf->data(), DATETIME_FORMAT_BUFFER_SIZE, pszFormat, &t);
    __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 nYear, nMonth, nDay;
    convertJulianToGregorian(m_nJDay, nYear, nMonth, nDay);
    return nYear;
}

Member Data Documentation

FORMAT_STRING

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

static

Definition at line 66 of file DateTime.h.

m_nJDay

long Date::m_nJDay

protected

Definition at line 77 of file DateTime.h.

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

• DateTime.h
• DateTime.cpp