/usr/include/cxxtools/date.h is in libcxxtools-dev 2.0-4ubuntu2.
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* Copyright (C) 2004-2008 Marc Boris Duerner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef CXXTOOLS_DATE_H
#define CXXTOOLS_DATE_H
#include <cxxtools/api.h>
#include <cxxtools/sourceinfo.h>
#include <string>
#include <stdexcept>
namespace cxxtools {
class SerializationInfo;
class CXXTOOLS_API InvalidDate : public std::invalid_argument
{
public:
InvalidDate(const SourceInfo& si);
~InvalidDate() throw()
{}
};
CXXTOOLS_API void greg2jul(unsigned& jd, int y, int m, int d);
CXXTOOLS_API void jul2greg(unsigned jd, int& y, int& m, int& d);
/*
Notes:
- Henry F. Fliegel and Thomas C. Van Flandern, "A Machine Algorithm for
Processing Calendar Dates". CACM, Vol. 11, No. 10, October 1968, pp 657.
*/
/** @brief %Date expressed in year, month, and day
@ingroup DateTime
*/
class Date
{
public:
enum Month
{
Jan = 1, Feb, Mar, Apr, May, Jun,
Jul, Aug, Sep, Oct, Nov, Dec
};
enum WeekDay
{
Sun = 0, Mon, Tue, Wed, Thu, Fri, Sat
};
/**
* @brief The number of days of an ordinary year.
*/
static const unsigned DaysPerYear = 365;
/**
* @brief The number of days of a leap year.
*/
static const unsigned DaysPerLeapYear = 366;
/**
* @brief The number of days of a January.
*/
static const unsigned DaysOfJan = 31;
/**
* @brief The number of days of a February.
*/
static const unsigned DaysOfFeb = 28;
/**
* @brief The number of days of a February in a leap year.
*/
static const unsigned DaysOfLeapFeb = 29;
/**
* @brief The number of days of a March.
*/
static const unsigned DaysOfMar = 31;
/**
* @brief The number of days of a April.
*/
static const unsigned DaysOfApr = 30;
/**
* @brief The number of days of a May.
*/
static const unsigned DaysOfMay = 31;
/**
* @brief The number of days of a June.
*/
static const unsigned DaysOfJun = 30;
/**
* @brief The number of days of a July.
*/
static const unsigned DaysOfJul = 31;
/**
* @brief The number of days of a August.
*/
static const unsigned DaysOfAug = 31;
/**
* @brief The number of days of a September.
*/
static const unsigned DaysOfSep = 30;
/**
* @brief The number of days of a October.
*/
static const unsigned DaysOfOct = 31;
/**
* @brief The number of days of a November.
*/
static const unsigned DaysOfNov = 30;
/**
* @brief The number of days of a December.
*/
static const unsigned DaysOfDec = 31;
public:
/** \brief Default constructor.
The default constructed date is undefined.
*/
Date()
: _julian(0)
{}
/** \brief Copy constructor.
*/
Date(const Date& date)
: _julian(date._julian)
{}
/** \brief Constructs a Date from given values
Sets the date to a new year, month and day.
InvalidDate is thrown if any of the values is out of range
*/
Date(int y, unsigned m, unsigned d)
{
greg2jul(_julian, y, m, d);
}
/** \brief Constructs a Date from a julian day
*/
explicit Date(unsigned julianDays)
: _julian(julianDays)
{}
/** @brief Sets the Date to a julian day
*/
void setJulian(unsigned d)
{ _julian=d; }
/** @brief Returns the Date as a julian day
*/
unsigned julian() const
{ return _julian; }
/** \brief Sets the date to a year, month and day
Sets the date to a new year, month and day.
InvalidDate is thrown if any of the values is out of range
*/
void set(int year, unsigned month, unsigned day)
{
greg2jul(_julian, year, month, day);
}
/** @brief Gets the year, month and day
*/
void get(int& year, unsigned& month, unsigned& day) const;
/** \brief Returns the day-part of the date.
*/
unsigned day() const;
/** \brief Returns the month-part of the date.
*/
unsigned month() const;
/** \brief Returns the year-part of the date.
*/
int year() const;
/** @brief Return day of the week, starting with sunday
*/
unsigned dayOfWeek() const;
/** @brief Returns the days of the month of the date
*/
unsigned daysInMonth() const;
/** @brief Returns the day of the year
*/
unsigned dayOfYear() const;
/** @brief Returns true if the date is in a leap year
*/
bool leapYear() const;
// TODO: move to cxxtools:.System
//static Date localDate();
// TODO: move to cxxtools:.System
//static Date universalDate();
/** @brief Assignment operator
*/
Date& operator=(const Date& date)
{ _julian = date._julian; return *this; }
/** @brief Add days to the date
*/
Date& operator+=(int days)
{ _julian += days; return *this; }
/** @brief Substract days from the date
*/
Date& operator-=(int days)
{ _julian -= days; return *this; }
/** @brief Increments the date by one day
*/
Date& operator++()
{ _julian++; return *this; }
/** @brief Decrements the date by one day
*/
Date& operator--()
{ _julian--; return *this; }
/** @brief Returns true if the dates are equal
*/
bool operator==(const Date& date) const
{ return _julian==date._julian; }
/** @brief Returns true if the dates are not equal
*/
bool operator!=(const Date& date) const
{ return _julian!=date._julian; }
/** @brief Less-than comparison operator
*/
bool operator<(const Date& date) const
{ return _julian<date._julian; }
/** @brief Less-than-equal comparison operator
*/
bool operator<=(const Date& date) const
{ return _julian<=date._julian; }
/** @brief Greater-than comparison operator
*/
bool operator>(const Date& date) const
{ return _julian>date._julian; }
/** @brief Greater-than-equal comparison operator
*/
bool operator>=(const Date& date) const
{ return _julian>=date._julian; }
friend inline Date operator+(const Date& d, int days);
friend inline Date operator+(int days, const Date& d);
friend inline int operator-(const Date& a, const Date& b);
/** \brief Returns the date in ISO-format
Converts the date in ISO-format (yyyy-mm-dd).
\return Date as iso formated string.
*/
std::string toIsoString() const;
/** \brief Interprets a string as a date-string in ISO-format
Interprets a string as a date-string in ISO-format (yyyy-mm-dd) and
returns a Date-object. When the string is not in ISO-format, an
exception is thrown.
\param s Iso formated date string.
\return Date result
\throw IllegalArgument
*/
static Date fromIsoString(const std::string& s);
public:
/** \brief Returns true if values describe a valid date
*/
static bool isValid(int y, int m, int d);
/** @brief Returns true if the year is in a leap year
*/
static bool leapYear(int year);
private:
//! @internal
unsigned _julian;
};
//CXXTOOLS_API void operator >>=(const SerializationInfo& si, Date& date);
//CXXTOOLS_API void operator <<=(SerializationInfo& si, const Date& date);
CXXTOOLS_API void convert(std::string& str, const Date& date);
CXXTOOLS_API void convert(Date& date, const std::string& s);
inline void Date::get(int& y, unsigned& m, unsigned& d) const
{
int mon, day;
jul2greg(_julian, y, mon, day);
m = mon;
d = day;
}
inline bool Date::leapYear(int y)
{
return ((y%4==0) && (y%100!=0)) || (y%400==0);
}
inline unsigned Date::day() const
{
int d,m,y;
jul2greg(_julian, y ,m, d);
return d;
}
inline unsigned Date::month() const
{
int d,m,y;
jul2greg(_julian, y, m, d);
return m;
}
inline int Date::year() const
{
int d,m,y;
jul2greg(_julian, y, m, d);
return y;
}
inline unsigned Date::dayOfWeek() const
{
return (_julian+1) % 7;
}
inline unsigned Date::daysInMonth() const
{
static const unsigned char monthDays[13]=
{
0,31,28,31,30,31,30,31,31,30,31,30,31
};
int y, m, d;
jul2greg(_julian, y, m, d);
if( m==2 && leapYear(y) )
return 29;
return monthDays[m];
}
inline unsigned Date::dayOfYear() const
{
int y,m,d;
unsigned jd;
jul2greg(_julian,y,m,d);
greg2jul(jd,y,1,1);
return _julian-jd+1;
}
inline bool Date::leapYear() const
{
int d,m,y;
jul2greg(_julian,y,m,d);
return leapYear(y);
}
inline bool Date::isValid(int y, int m, int d)
{
if(m<1 || m>12 || d<1 || d>31)
{
return false;
}
return true;
}
inline std::string Date::toIsoString() const
{
std::string str;
convert(str, *this);
return str;
}
inline Date Date::fromIsoString(const std::string& s)
{
Date date;
convert(date, s);
return date;
}
inline Date operator+(const Date& d, int days)
{ return Date(d._julian + days); }
inline Date operator+(int days, const Date& d)
{ return Date(days + d._julian); }
inline int operator-(const Date& a, const Date& b)
{ return a._julian - b._julian; }
}
#endif
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