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wxWidgets/include/wx/datetime.h
Vadim Zeitlin 5ed8879eaf Make wxDateTime::Tm::yday public and document it. 
There doesn't seem any reason to allow access to all the other struct Tm
fields but not yday so make it public, fill it in correctly when creating Tm
without using its ctor from struct tm and document struct Tm itself including
its yday field.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65649 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2010-09-26 22:11:21 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: wx/datetime.h
// Purpose: declarations of time/date related classes (wxDateTime,
// wxTimeSpan)
// Author: Vadim Zeitlin
// Modified by:
// Created: 10.02.99
// RCS-ID: $Id$
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_DATETIME_H
#define _WX_DATETIME_H
#include "wx/defs.h"
#if wxUSE_DATETIME
#ifdef __WXWINCE__
#include "wx/msw/wince/time.h"
#elif !defined(__WXPALMOS5__)
#include <time.h>
#endif // OS
#include <limits.h> // for INT_MIN
#include "wx/longlong.h"
#include "wx/anystr.h"
class WXDLLIMPEXP_FWD_BASE wxDateTime;
class WXDLLIMPEXP_FWD_BASE wxTimeSpan;
class WXDLLIMPEXP_FWD_BASE wxDateSpan;
#ifdef __WXMSW__
struct _SYSTEMTIME;
#endif
#include "wx/dynarray.h"
// not all c-runtimes are based on 1/1/1970 being (time_t) 0
// set this to the corresponding value in seconds 1/1/1970 has on your
// systems c-runtime
#define WX_TIME_BASE_OFFSET 0
/*
* TODO
*
* + 1. Time zones with minutes (make TimeZone a class)
* ? 2. getdate() function like under Solaris
* + 3. text conversion for wxDateSpan
* + 4. pluggable modules for the workdays calculations
* 5. wxDateTimeHolidayAuthority for Easter and other christian feasts
*/
/* Two wrapper functions for thread safety */
#ifdef HAVE_LOCALTIME_R
#define wxLocaltime_r localtime_r
#else
WXDLLIMPEXP_BASE struct tm *wxLocaltime_r(const time_t*, struct tm*);
#if wxUSE_THREADS && !defined(__WINDOWS__) && !defined(__WATCOMC__)
// On Windows, localtime _is_ threadsafe!
#warning using pseudo thread-safe wrapper for localtime to emulate localtime_r
#endif
#endif
#ifdef HAVE_GMTIME_R
#define wxGmtime_r gmtime_r
#else
WXDLLIMPEXP_BASE struct tm *wxGmtime_r(const time_t*, struct tm*);
#if wxUSE_THREADS && !defined(__WINDOWS__) && !defined(__WATCOMC__)
// On Windows, gmtime _is_ threadsafe!
#warning using pseudo thread-safe wrapper for gmtime to emulate gmtime_r
#endif
#endif
/*
The three (main) classes declared in this header represent:
1. An absolute moment in the time (wxDateTime)
2. A difference between two moments in the time, positive or negative
(wxTimeSpan)
3. A logical difference between two dates expressed in
years/months/weeks/days (wxDateSpan)
The following arithmetic operations are permitted (all others are not):
addition
--------
wxDateTime + wxTimeSpan = wxDateTime
wxDateTime + wxDateSpan = wxDateTime
wxTimeSpan + wxTimeSpan = wxTimeSpan
wxDateSpan + wxDateSpan = wxDateSpan
subtraction
------------
wxDateTime - wxDateTime = wxTimeSpan
wxDateTime - wxTimeSpan = wxDateTime
wxDateTime - wxDateSpan = wxDateTime
wxTimeSpan - wxTimeSpan = wxTimeSpan
wxDateSpan - wxDateSpan = wxDateSpan
multiplication
--------------
wxTimeSpan * number = wxTimeSpan
number * wxTimeSpan = wxTimeSpan
wxDateSpan * number = wxDateSpan
number * wxDateSpan = wxDateSpan
unitary minus
-------------
-wxTimeSpan = wxTimeSpan
-wxDateSpan = wxDateSpan
For each binary operation OP (+, -, *) we have the following operatorOP=() as
a method and the method with a symbolic name OPER (Add, Subtract, Multiply)
as a synonym for it and another const method with the same name which returns
the changed copy of the object and operatorOP() as a global function which is
implemented in terms of the const version of OPEN. For the unary - we have
operator-() as a method, Neg() as synonym for it and Negate() which returns
the copy of the object with the changed sign.
*/
// an invalid/default date time object which may be used as the default
// argument for arguments of type wxDateTime; it is also returned by all
// functions returning wxDateTime on failure (this is why it is also called
// wxInvalidDateTime)
class WXDLLIMPEXP_FWD_BASE wxDateTime;
extern WXDLLIMPEXP_DATA_BASE(const char) wxDefaultDateTimeFormat[];
extern WXDLLIMPEXP_DATA_BASE(const char) wxDefaultTimeSpanFormat[];
extern WXDLLIMPEXP_DATA_BASE(const wxDateTime) wxDefaultDateTime;
#define wxInvalidDateTime wxDefaultDateTime
// ----------------------------------------------------------------------------
// conditional compilation
// ----------------------------------------------------------------------------
// if configure detected strftime(), we have it too
#ifdef HAVE_STRFTIME
#define wxHAS_STRFTIME
// suppose everyone else has strftime except Win CE unless VC8 is used
#elif !defined(__WXWINCE__) || defined(__VISUALC8__)
#define wxHAS_STRFTIME
#endif
// ----------------------------------------------------------------------------
// wxDateTime represents an absolute moment in the time
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxDateTime
{
public:
// types
// ------------------------------------------------------------------------
// a small unsigned integer type for storing things like minutes,
// seconds &c. It should be at least short (i.e. not char) to contain
// the number of milliseconds - it may also be 'int' because there is
// no size penalty associated with it in our code, we don't store any
// data in this format
typedef unsigned short wxDateTime_t;
// constants
// ------------------------------------------------------------------------
// the timezones
enum TZ
{
// the time in the current time zone
Local,
// zones from GMT (= Greenwhich Mean Time): they're guaranteed to be
// consequent numbers, so writing something like `GMT0 + offset' is
// safe if abs(offset) <= 12
// underscore stands for minus
GMT_12, GMT_11, GMT_10, GMT_9, GMT_8, GMT_7,
GMT_6, GMT_5, GMT_4, GMT_3, GMT_2, GMT_1,
GMT0,
GMT1, GMT2, GMT3, GMT4, GMT5, GMT6,
GMT7, GMT8, GMT9, GMT10, GMT11, GMT12, GMT13,
// Note that GMT12 and GMT_12 are not the same: there is a difference
// of exactly one day between them
// some symbolic names for TZ
// Europe
WET = GMT0, // Western Europe Time
WEST = GMT1, // Western Europe Summer Time
CET = GMT1, // Central Europe Time
CEST = GMT2, // Central Europe Summer Time
EET = GMT2, // Eastern Europe Time
EEST = GMT3, // Eastern Europe Summer Time
MSK = GMT3, // Moscow Time
MSD = GMT4, // Moscow Summer Time
// US and Canada
AST = GMT_4, // Atlantic Standard Time
ADT = GMT_3, // Atlantic Daylight Time
EST = GMT_5, // Eastern Standard Time
EDT = GMT_4, // Eastern Daylight Saving Time
CST = GMT_6, // Central Standard Time
CDT = GMT_5, // Central Daylight Saving Time
MST = GMT_7, // Mountain Standard Time
MDT = GMT_6, // Mountain Daylight Saving Time
PST = GMT_8, // Pacific Standard Time
PDT = GMT_7, // Pacific Daylight Saving Time
HST = GMT_10, // Hawaiian Standard Time
AKST = GMT_9, // Alaska Standard Time
AKDT = GMT_8, // Alaska Daylight Saving Time
// Australia
A_WST = GMT8, // Western Standard Time
A_CST = GMT13 + 1, // Central Standard Time (+9.5)
A_EST = GMT10, // Eastern Standard Time
A_ESST = GMT11, // Eastern Summer Time
// New Zealand
NZST = GMT12, // Standard Time
NZDT = GMT13, // Daylight Saving Time
// TODO add more symbolic timezone names here
// Universal Coordinated Time = the new and politically correct name
// for GMT
UTC = GMT0
};
// the calendar systems we know about: notice that it's valid (for
// this classes purpose anyhow) to work with any of these calendars
// even with the dates before the historical appearance of the
// calendar
enum Calendar
{
Gregorian, // current calendar
Julian // calendar in use since -45 until the 1582 (or later)
// TODO Hebrew, Chinese, Maya, ... (just kidding) (or then may be not?)
};
// these values only are used to identify the different dates of
// adoption of the Gregorian calendar (see IsGregorian())
//
// All data and comments taken verbatim from "The Calendar FAQ (v 2.0)"
// by Claus Tøndering, http://www.pip.dknet.dk/~c-t/calendar.html
// except for the comments "we take".
//
// Symbol "->" should be read as "was followed by" in the comments
// which follow.
enum GregorianAdoption
{
Gr_Unknown, // no data for this country or it's too uncertain to use
Gr_Standard, // on the day 0 of Gregorian calendar: 15 Oct 1582
Gr_Alaska, // Oct 1867 when Alaska became part of the USA
Gr_Albania, // Dec 1912
Gr_Austria = Gr_Unknown, // Different regions on different dates
Gr_Austria_Brixen, // 5 Oct 1583 -> 16 Oct 1583
Gr_Austria_Salzburg = Gr_Austria_Brixen,
Gr_Austria_Tyrol = Gr_Austria_Brixen,
Gr_Austria_Carinthia, // 14 Dec 1583 -> 25 Dec 1583
Gr_Austria_Styria = Gr_Austria_Carinthia,
Gr_Belgium, // Then part of the Netherlands
Gr_Bulgaria = Gr_Unknown, // Unknown precisely (from 1915 to 1920)
Gr_Bulgaria_1, // 18 Mar 1916 -> 1 Apr 1916
Gr_Bulgaria_2, // 31 Mar 1916 -> 14 Apr 1916
Gr_Bulgaria_3, // 3 Sep 1920 -> 17 Sep 1920
Gr_Canada = Gr_Unknown, // Different regions followed the changes in
// Great Britain or France
Gr_China = Gr_Unknown, // Different authorities say:
Gr_China_1, // 18 Dec 1911 -> 1 Jan 1912
Gr_China_2, // 18 Dec 1928 -> 1 Jan 1929
Gr_Czechoslovakia, // (Bohemia and Moravia) 6 Jan 1584 -> 17 Jan 1584
Gr_Denmark, // (including Norway) 18 Feb 1700 -> 1 Mar 1700
Gr_Egypt, // 1875
Gr_Estonia, // 1918
Gr_Finland, // Then part of Sweden
Gr_France, // 9 Dec 1582 -> 20 Dec 1582
Gr_France_Alsace, // 4 Feb 1682 -> 16 Feb 1682
Gr_France_Lorraine, // 16 Feb 1760 -> 28 Feb 1760
Gr_France_Strasbourg, // February 1682
Gr_Germany = Gr_Unknown, // Different states on different dates:
Gr_Germany_Catholic, // 1583-1585 (we take 1584)
Gr_Germany_Prussia, // 22 Aug 1610 -> 2 Sep 1610
Gr_Germany_Protestant, // 18 Feb 1700 -> 1 Mar 1700
Gr_GreatBritain, // 2 Sep 1752 -> 14 Sep 1752 (use 'cal(1)')
Gr_Greece, // 9 Mar 1924 -> 23 Mar 1924
Gr_Hungary, // 21 Oct 1587 -> 1 Nov 1587
Gr_Ireland = Gr_GreatBritain,
Gr_Italy = Gr_Standard,
Gr_Japan = Gr_Unknown, // Different authorities say:
Gr_Japan_1, // 19 Dec 1872 -> 1 Jan 1873
Gr_Japan_2, // 19 Dec 1892 -> 1 Jan 1893
Gr_Japan_3, // 18 Dec 1918 -> 1 Jan 1919
Gr_Latvia, // 1915-1918 (we take 1915)
Gr_Lithuania, // 1915
Gr_Luxemburg, // 14 Dec 1582 -> 25 Dec 1582
Gr_Netherlands = Gr_Belgium, // (including Belgium) 1 Jan 1583
// this is too weird to take into account: the Gregorian calendar was
// introduced twice in Groningen, first time 28 Feb 1583 was followed
// by 11 Mar 1583, then it has gone back to Julian in the summer of
// 1584 and then 13 Dec 1700 -> 12 Jan 1701 - which is
// the date we take here
Gr_Netherlands_Groningen, // 13 Dec 1700 -> 12 Jan 1701
Gr_Netherlands_Gelderland, // 30 Jun 1700 -> 12 Jul 1700
Gr_Netherlands_Utrecht, // (and Overijssel) 30 Nov 1700->12 Dec 1700
Gr_Netherlands_Friesland, // (and Drenthe) 31 Dec 1700 -> 12 Jan 1701
Gr_Norway = Gr_Denmark, // Then part of Denmark
Gr_Poland = Gr_Standard,
Gr_Portugal = Gr_Standard,
Gr_Romania, // 31 Mar 1919 -> 14 Apr 1919
Gr_Russia, // 31 Jan 1918 -> 14 Feb 1918
Gr_Scotland = Gr_GreatBritain,
Gr_Spain = Gr_Standard,
// Sweden has a curious history. Sweden decided to make a gradual
// change from the Julian to the Gregorian calendar. By dropping every
// leap year from 1700 through 1740 the eleven superfluous days would
// be omitted and from 1 Mar 1740 they would be in sync with the
// Gregorian calendar. (But in the meantime they would be in sync with
// nobody!)
//
// So 1700 (which should have been a leap year in the Julian calendar)
// was not a leap year in Sweden. However, by mistake 1704 and 1708
// became leap years. This left Sweden out of synchronisation with
// both the Julian and the Gregorian world, so they decided to go back
// to the Julian calendar. In order to do this, they inserted an extra
// day in 1712, making that year a double leap year! So in 1712,
// February had 30 days in Sweden.
//
// Later, in 1753, Sweden changed to the Gregorian calendar by
// dropping 11 days like everyone else.
Gr_Sweden = Gr_Finland, // 17 Feb 1753 -> 1 Mar 1753
Gr_Switzerland = Gr_Unknown,// Different cantons used different dates
Gr_Switzerland_Catholic, // 1583, 1584 or 1597 (we take 1584)
Gr_Switzerland_Protestant, // 31 Dec 1700 -> 12 Jan 1701
Gr_Turkey, // 1 Jan 1927
Gr_USA = Gr_GreatBritain,
Gr_Wales = Gr_GreatBritain,
Gr_Yugoslavia // 1919
};
// the country parameter is used so far for calculating the start and
// the end of DST period and for deciding whether the date is a work
// day or not
//
// TODO move this to intl.h
// Required for WinCE
#ifdef USA
#undef USA
#endif
enum Country
{
Country_Unknown, // no special information for this country
Country_Default, // set the default country with SetCountry() method
// or use the default country with any other
// TODO add more countries (for this we must know about DST and/or
// holidays for this country)
// Western European countries: we assume that they all follow the same
// DST rules (true or false?)
Country_WesternEurope_Start,
Country_EEC = Country_WesternEurope_Start,
France,
Germany,
UK,
Country_WesternEurope_End = UK,
Russia,
USA
};
// symbolic names for the months
enum Month
{
Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec, Inv_Month
};
// symbolic names for the weekdays
enum WeekDay
{
Sun, Mon, Tue, Wed, Thu, Fri, Sat, Inv_WeekDay
};
// invalid value for the year
enum Year
{
Inv_Year = SHRT_MIN // should hold in wxDateTime_t
};
// flags for GetWeekDayName and GetMonthName
enum NameFlags
{
Name_Full = 0x01, // return full name
Name_Abbr = 0x02 // return abbreviated name
};
// flags for GetWeekOfYear and GetWeekOfMonth
enum WeekFlags
{
Default_First, // Sunday_First for US, Monday_First for the rest
Monday_First, // week starts with a Monday
Sunday_First // week starts with a Sunday
};
// helper classes
// ------------------------------------------------------------------------
// a class representing a time zone: basicly, this is just an offset
// (in seconds) from GMT
class WXDLLIMPEXP_BASE TimeZone
{
public:
TimeZone(TZ tz);
// create time zone object with the given offset
TimeZone(long offset = 0) { m_offset = offset; }
static TimeZone Make(long offset)
{
TimeZone tz;
tz.m_offset = offset;
return tz;
}
long GetOffset() const { return m_offset; }
private:
// offset for this timezone from GMT in seconds
long m_offset;
};
// standard struct tm is limited to the years from 1900 (because
// tm_year field is the offset from 1900), so we use our own struct
// instead to represent broken down time
//
// NB: this struct should always be kept normalized (i.e. mon should
// be < 12, 1 <= day <= 31 &c), so use AddMonths(), AddDays()
// instead of modifying the member fields directly!
struct WXDLLIMPEXP_BASE Tm
{
wxDateTime_t msec, sec, min, hour,
mday, // Day of the month in 1..31 range.
yday; // Day of the year in 0..365 range.
Month mon;
int year;
// default ctor inits the object to an invalid value
Tm();
// ctor from struct tm and the timezone
Tm(const struct tm& tm, const TimeZone& tz);
// check that the given date/time is valid (in Gregorian calendar)
bool IsValid() const;
// get the week day
WeekDay GetWeekDay() // not const because wday may be changed
{
if ( wday == Inv_WeekDay )
ComputeWeekDay();
return (WeekDay)wday;
}
// add the given number of months to the date keeping it normalized
void AddMonths(int monDiff);
// add the given number of months to the date keeping it normalized
void AddDays(int dayDiff);
private:
// compute the weekday from other fields
void ComputeWeekDay();
// the timezone we correspond to
TimeZone m_tz;
// This value can only be accessed via GetWeekDay() and not directly
// because it's not always computed when creating this object and may
// need to be calculated on demand.
wxDateTime_t wday;
};
// static methods
// ------------------------------------------------------------------------
// set the current country
static void SetCountry(Country country);
// get the current country
static Country GetCountry();
// return true if the country is a West European one (in practice,
// this means that the same DST rules as for EEC apply)
static bool IsWestEuropeanCountry(Country country = Country_Default);
// return the current year
static int GetCurrentYear(Calendar cal = Gregorian);
// convert the year as returned by wxDateTime::GetYear() to a year
// suitable for BC/AD notation. The difference is that BC year 1
// corresponds to the year 0 (while BC year 0 didn't exist) and AD
// year N is just year N.
static int ConvertYearToBC(int year);
// return the current month
static Month GetCurrentMonth(Calendar cal = Gregorian);
// returns true if the given year is a leap year in the given calendar
static bool IsLeapYear(int year = Inv_Year, Calendar cal = Gregorian);
// get the century (19 for 1999, 20 for 2000 and -5 for 492 BC)
static int GetCentury(int year);
// returns the number of days in this year (356 or 355 for Gregorian
// calendar usually :-)
static wxDateTime_t GetNumberOfDays(int year, Calendar cal = Gregorian);
// get the number of the days in the given month (default value for
// the year means the current one)
static wxDateTime_t GetNumberOfDays(Month month,
int year = Inv_Year,
Calendar cal = Gregorian);
// get the full (default) or abbreviated month name in the current
// locale, returns empty string on error
static wxString GetMonthName(Month month,
NameFlags flags = Name_Full);
// get the standard English full (default) or abbreviated month name
static wxString GetEnglishMonthName(Month month,
NameFlags flags = Name_Full);
// get the full (default) or abbreviated weekday name in the current
// locale, returns empty string on error
static wxString GetWeekDayName(WeekDay weekday,
NameFlags flags = Name_Full);
// get the standard English full (default) or abbreviated weekday name
static wxString GetEnglishWeekDayName(WeekDay weekday,
NameFlags flags = Name_Full);
// get the AM and PM strings in the current locale (may be empty)
static void GetAmPmStrings(wxString *am, wxString *pm);
// return true if the given country uses DST for this year
static bool IsDSTApplicable(int year = Inv_Year,
Country country = Country_Default);
// get the beginning of DST for this year, will return invalid object
// if no DST applicable in this year. The default value of the
// parameter means to take the current year.
static wxDateTime GetBeginDST(int year = Inv_Year,
Country country = Country_Default);
// get the end of DST for this year, will return invalid object
// if no DST applicable in this year. The default value of the
// parameter means to take the current year.
static wxDateTime GetEndDST(int year = Inv_Year,
Country country = Country_Default);
// return the wxDateTime object for the current time
static inline wxDateTime Now();
// return the wxDateTime object for the current time with millisecond
// precision (if available on this platform)
static wxDateTime UNow();
// return the wxDateTime object for today midnight: i.e. as Now() but
// with time set to 0
static inline wxDateTime Today();
// constructors: you should test whether the constructor succeeded with
// IsValid() function. The values Inv_Month and Inv_Year for the
// parameters mean take current month and/or year values.
// ------------------------------------------------------------------------
// default ctor does not initialize the object, use Set()!
wxDateTime() { m_time = wxLongLong(wxINT32_MIN, 0); }
// from time_t: seconds since the Epoch 00:00:00 UTC, Jan 1, 1970)
#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
// VA C++ confuses this with wxDateTime(double jdn) thinking it is a duplicate declaration
inline wxDateTime(time_t timet);
#endif
// from broken down time/date (only for standard Unix range)
inline wxDateTime(const struct tm& tm);
// from broken down time/date (any range)
inline wxDateTime(const Tm& tm);
// from JDN (beware of rounding errors)
inline wxDateTime(double jdn);
// from separate values for each component, date set to today
inline wxDateTime(wxDateTime_t hour,
wxDateTime_t minute = 0,
wxDateTime_t second = 0,
wxDateTime_t millisec = 0);
// from separate values for each component with explicit date
inline wxDateTime(wxDateTime_t day, // day of the month
Month month,
int year = Inv_Year, // 1999, not 99 please!
wxDateTime_t hour = 0,
wxDateTime_t minute = 0,
wxDateTime_t second = 0,
wxDateTime_t millisec = 0);
#ifdef __WXMSW__
wxDateTime(const struct _SYSTEMTIME& st)
{
SetFromMSWSysTime(st);
}
#endif
// default copy ctor ok
// no dtor
// assignment operators and Set() functions: all non const methods return
// the reference to this object. IsValid() should be used to test whether
// the function succeeded.
// ------------------------------------------------------------------------
// set to the current time
inline wxDateTime& SetToCurrent();
#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
// VA C++ confuses this with wxDateTime(double jdn) thinking it is a duplicate declaration
// set to given time_t value
inline wxDateTime& Set(time_t timet);
#endif
// set to given broken down time/date
wxDateTime& Set(const struct tm& tm);
// set to given broken down time/date
inline wxDateTime& Set(const Tm& tm);
// set to given JDN (beware of rounding errors)
wxDateTime& Set(double jdn);
// set to given time, date = today
wxDateTime& Set(wxDateTime_t hour,
wxDateTime_t minute = 0,
wxDateTime_t second = 0,
wxDateTime_t millisec = 0);
// from separate values for each component with explicit date
// (defaults for month and year are the current values)
wxDateTime& Set(wxDateTime_t day,
Month month,
int year = Inv_Year, // 1999, not 99 please!
wxDateTime_t hour = 0,
wxDateTime_t minute = 0,
wxDateTime_t second = 0,
wxDateTime_t millisec = 0);
// resets time to 00:00:00, doesn't change the date
wxDateTime& ResetTime();
// get the date part of this object only, i.e. the object which has the
// same date as this one but time of 00:00:00
wxDateTime GetDateOnly() const;
// the following functions don't change the values of the other
// fields, i.e. SetMinute() won't change either hour or seconds value
// set the year
wxDateTime& SetYear(int year);
// set the month
wxDateTime& SetMonth(Month month);
// set the day of the month
wxDateTime& SetDay(wxDateTime_t day);
// set hour
wxDateTime& SetHour(wxDateTime_t hour);
// set minute
wxDateTime& SetMinute(wxDateTime_t minute);
// set second
wxDateTime& SetSecond(wxDateTime_t second);
// set millisecond
wxDateTime& SetMillisecond(wxDateTime_t millisecond);
// assignment operator from time_t
wxDateTime& operator=(time_t timet) { return Set(timet); }
// assignment operator from broken down time/date
wxDateTime& operator=(const struct tm& tm) { return Set(tm); }
// assignment operator from broken down time/date
wxDateTime& operator=(const Tm& tm) { return Set(tm); }
// default assignment operator is ok
// calendar calculations (functions which set the date only leave the time
// unchanged, e.g. don't explictly zero it): SetXXX() functions modify the
// object itself, GetXXX() ones return a new object.
// ------------------------------------------------------------------------
// set to the given week day in the same week as this one
wxDateTime& SetToWeekDayInSameWeek(WeekDay weekday,
WeekFlags flags = Monday_First);
inline wxDateTime GetWeekDayInSameWeek(WeekDay weekday,
WeekFlags flags = Monday_First) const;
// set to the next week day following this one
wxDateTime& SetToNextWeekDay(WeekDay weekday);
inline wxDateTime GetNextWeekDay(WeekDay weekday) const;
// set to the previous week day before this one
wxDateTime& SetToPrevWeekDay(WeekDay weekday);
inline wxDateTime GetPrevWeekDay(WeekDay weekday) const;
// set to Nth occurrence of given weekday in the given month of the
// given year (time is set to 0), return true on success and false on
// failure. n may be positive (1..5) or negative to count from the end
// of the month (see helper function SetToLastWeekDay())
bool SetToWeekDay(WeekDay weekday,
int n = 1,
Month month = Inv_Month,
int year = Inv_Year);
inline wxDateTime GetWeekDay(WeekDay weekday,
int n = 1,
Month month = Inv_Month,
int year = Inv_Year) const;
// sets to the last weekday in the given month, year
inline bool SetToLastWeekDay(WeekDay weekday,
Month month = Inv_Month,
int year = Inv_Year);
inline wxDateTime GetLastWeekDay(WeekDay weekday,
Month month = Inv_Month,
int year = Inv_Year);
#if WXWIN_COMPATIBILITY_2_6
// sets the date to the given day of the given week in the year,
// returns true on success and false if given date doesn't exist (e.g.
// numWeek is > 53)
//
// these functions are badly defined as they're not the reverse of
// GetWeekOfYear(), use SetToTheWeekOfYear() instead
wxDEPRECATED( bool SetToTheWeek(wxDateTime_t numWeek,
WeekDay weekday = Mon,
WeekFlags flags = Monday_First) );
wxDEPRECATED( wxDateTime GetWeek(wxDateTime_t numWeek,
WeekDay weekday = Mon,
WeekFlags flags = Monday_First) const );
#endif // WXWIN_COMPATIBILITY_2_6
// returns the date corresponding to the given week day of the given
// week (in ISO notation) of the specified year
static wxDateTime SetToWeekOfYear(int year,
wxDateTime_t numWeek,
WeekDay weekday = Mon);
// sets the date to the last day of the given (or current) month or the
// given (or current) year
wxDateTime& SetToLastMonthDay(Month month = Inv_Month,
int year = Inv_Year);
inline wxDateTime GetLastMonthDay(Month month = Inv_Month,
int year = Inv_Year) const;
// sets to the given year day (1..365 or 366)
wxDateTime& SetToYearDay(wxDateTime_t yday);
inline wxDateTime GetYearDay(wxDateTime_t yday) const;
// The definitions below were taken verbatim from
//
// http://www.capecod.net/~pbaum/date/date0.htm
//
// (Peter Baum's home page)
//
// definition: The Julian Day Number, Julian Day, or JD of a
// particular instant of time is the number of days and fractions of a
// day since 12 hours Universal Time (Greenwich mean noon) on January
// 1 of the year -4712, where the year is given in the Julian
// proleptic calendar. The idea of using this reference date was
// originally proposed by Joseph Scalizer in 1582 to count years but
// it was modified by 19th century astronomers to count days. One
// could have equivalently defined the reference time to be noon of
// November 24, -4713 if were understood that Gregorian calendar rules
// were applied. Julian days are Julian Day Numbers and are not to be
// confused with Julian dates.
//
// definition: The Rata Die number is a date specified as the number
// of days relative to a base date of December 31 of the year 0. Thus
// January 1 of the year 1 is Rata Die day 1.
// get the Julian Day number (the fractional part specifies the time of
// the day, related to noon - beware of rounding errors!)
double GetJulianDayNumber() const;
double GetJDN() const { return GetJulianDayNumber(); }
// get the Modified Julian Day number: it is equal to JDN - 2400000.5
// and so integral MJDs correspond to the midnights (and not noons).
// MJD 0 is Nov 17, 1858
double GetModifiedJulianDayNumber() const { return GetJDN() - 2400000.5; }
double GetMJD() const { return GetModifiedJulianDayNumber(); }
// get the Rata Die number
double GetRataDie() const;
// TODO algorithms for calculating some important dates, such as
// religious holidays (Easter...) or moon/solar eclipses? Some
// algorithms can be found in the calendar FAQ
// Timezone stuff: a wxDateTime object constructed using given
// day/month/year/hour/min/sec values is interpreted as this moment in
// local time. Using the functions below, it may be converted to another
// time zone (e.g., the Unix epoch is wxDateTime(1, Jan, 1970).ToGMT()).
//
// These functions try to handle DST internally, but there is no magical
// way to know all rules for it in all countries in the world, so if the
// program can handle it itself (or doesn't want to handle it at all for
// whatever reason), the DST handling can be disabled with noDST.
// ------------------------------------------------------------------------
// transform to any given timezone
inline wxDateTime ToTimezone(const TimeZone& tz, bool noDST = false) const;
wxDateTime& MakeTimezone(const TimeZone& tz, bool noDST = false);
// interpret current value as being in another timezone and transform
// it to local one
inline wxDateTime FromTimezone(const TimeZone& tz, bool noDST = false) const;
wxDateTime& MakeFromTimezone(const TimeZone& tz, bool noDST = false);
// transform to/from GMT/UTC
wxDateTime ToUTC(bool noDST = false) const { return ToTimezone(UTC, noDST); }
wxDateTime& MakeUTC(bool noDST = false) { return MakeTimezone(UTC, noDST); }
wxDateTime ToGMT(bool noDST = false) const { return ToUTC(noDST); }
wxDateTime& MakeGMT(bool noDST = false) { return MakeUTC(noDST); }
wxDateTime FromUTC(bool noDST = false) const
{ return FromTimezone(UTC, noDST); }
wxDateTime& MakeFromUTC(bool noDST = false)
{ return MakeFromTimezone(UTC, noDST); }
// is daylight savings time in effect at this moment according to the
// rules of the specified country?
//
// Return value is > 0 if DST is in effect, 0 if it is not and -1 if
// the information is not available (this is compatible with ANSI C)
int IsDST(Country country = Country_Default) const;
// accessors: many of them take the timezone parameter which indicates the
// timezone for which to make the calculations and the default value means
// to do it for the current timezone of this machine (even if the function
// only operates with the date it's necessary because a date may wrap as
// result of timezone shift)
// ------------------------------------------------------------------------
// is the date valid?
inline bool IsValid() const { return m_time != wxInvalidDateTime.m_time; }
// get the broken down date/time representation in the given timezone
//
// If you wish to get several time components (day, month and year),
// consider getting the whole Tm strcuture first and retrieving the
// value from it - this is much more efficient
Tm GetTm(const TimeZone& tz = Local) const;
// get the number of seconds since the Unix epoch - returns (time_t)-1
// if the value is out of range
inline time_t GetTicks() const;
// get the century, same as GetCentury(GetYear())
int GetCentury(const TimeZone& tz = Local) const
{ return GetCentury(GetYear(tz)); }
// get the year (returns Inv_Year if date is invalid)
int GetYear(const TimeZone& tz = Local) const
{ return GetTm(tz).year; }
// get the month (Inv_Month if date is invalid)
Month GetMonth(const TimeZone& tz = Local) const
{ return (Month)GetTm(tz).mon; }
// get the month day (in 1..31 range, 0 if date is invalid)
wxDateTime_t GetDay(const TimeZone& tz = Local) const
{ return GetTm(tz).mday; }
// get the day of the week (Inv_WeekDay if date is invalid)
WeekDay GetWeekDay(const TimeZone& tz = Local) const
{ return GetTm(tz).GetWeekDay(); }
// get the hour of the day
wxDateTime_t GetHour(const TimeZone& tz = Local) const
{ return GetTm(tz).hour; }
// get the minute
wxDateTime_t GetMinute(const TimeZone& tz = Local) const
{ return GetTm(tz).min; }
// get the second
wxDateTime_t GetSecond(const TimeZone& tz = Local) const
{ return GetTm(tz).sec; }
// get milliseconds
wxDateTime_t GetMillisecond(const TimeZone& tz = Local) const
{ return GetTm(tz).msec; }
// get the day since the year start (1..366, 0 if date is invalid)
wxDateTime_t GetDayOfYear(const TimeZone& tz = Local) const;
// get the week number since the year start (1..52 or 53, 0 if date is
// invalid)
wxDateTime_t GetWeekOfYear(WeekFlags flags = Monday_First,
const TimeZone& tz = Local) const;
// get the week number since the month start (1..5, 0 if date is
// invalid)
wxDateTime_t GetWeekOfMonth(WeekFlags flags = Monday_First,
const TimeZone& tz = Local) const;
// is this date a work day? This depends on a country, of course,
// because the holidays are different in different countries
bool IsWorkDay(Country country = Country_Default) const;
// is this date later than Gregorian calendar introduction for the
// given country (see enum GregorianAdoption)?
//
// NB: this function shouldn't be considered as absolute authority in
// the matter. Besides, for some countries the exact date of
// adoption of the Gregorian calendar is simply unknown.
bool IsGregorianDate(GregorianAdoption country = Gr_Standard) const;
// dos date and time format
// ------------------------------------------------------------------------
// set from the DOS packed format
wxDateTime& SetFromDOS(unsigned long ddt);
// pack the date in DOS format
unsigned long GetAsDOS() const;
// SYSTEMTIME format
// ------------------------------------------------------------------------
#ifdef __WXMSW__
// convert SYSTEMTIME to wxDateTime
wxDateTime& SetFromMSWSysTime(const struct _SYSTEMTIME& st);
// convert wxDateTime to SYSTEMTIME
void GetAsMSWSysTime(struct _SYSTEMTIME* st) const;
// same as above but only take date part into account, time is always zero
wxDateTime& SetFromMSWSysDate(const struct _SYSTEMTIME& st);
void GetAsMSWSysDate(struct _SYSTEMTIME* st) const;
#endif // __WXMSW__
// comparison (see also functions below for operator versions)
// ------------------------------------------------------------------------
// returns true if the two moments are strictly identical
inline bool IsEqualTo(const wxDateTime& datetime) const;
// returns true if the date is strictly earlier than the given one
inline bool IsEarlierThan(const wxDateTime& datetime) const;
// returns true if the date is strictly later than the given one
inline bool IsLaterThan(const wxDateTime& datetime) const;
// returns true if the date is strictly in the given range
inline bool IsStrictlyBetween(const wxDateTime& t1,
const wxDateTime& t2) const;
// returns true if the date is in the given range
inline bool IsBetween(const wxDateTime& t1, const wxDateTime& t2) const;
// do these two objects refer to the same date?
inline bool IsSameDate(const wxDateTime& dt) const;
// do these two objects have the same time?
inline bool IsSameTime(const wxDateTime& dt) const;
// are these two objects equal up to given timespan?
inline bool IsEqualUpTo(const wxDateTime& dt, const wxTimeSpan& ts) const;
inline bool operator<(const wxDateTime& dt) const
{
wxASSERT_MSG( IsValid() && dt.IsValid(), wxT("invalid wxDateTime") );
return GetValue() < dt.GetValue();
}
inline bool operator<=(const wxDateTime& dt) const
{
wxASSERT_MSG( IsValid() && dt.IsValid(), wxT("invalid wxDateTime") );
return GetValue() <= dt.GetValue();
}
inline bool operator>(const wxDateTime& dt) const
{
wxASSERT_MSG( IsValid() && dt.IsValid(), wxT("invalid wxDateTime") );
return GetValue() > dt.GetValue();
}
inline bool operator>=(const wxDateTime& dt) const
{
wxASSERT_MSG( IsValid() && dt.IsValid(), wxT("invalid wxDateTime") );
return GetValue() >= dt.GetValue();
}
inline bool operator==(const wxDateTime& dt) const
{
wxASSERT_MSG( IsValid() && dt.IsValid(), wxT("invalid wxDateTime") );
return GetValue() == dt.GetValue();
}
inline bool operator!=(const wxDateTime& dt) const
{
wxASSERT_MSG( IsValid() && dt.IsValid(), wxT("invalid wxDateTime") );
return GetValue() != dt.GetValue();
}
// arithmetics with dates (see also below for more operators)
// ------------------------------------------------------------------------
// return the sum of the date with a time span (positive or negative)
inline wxDateTime Add(const wxTimeSpan& diff) const;
// add a time span (positive or negative)
inline wxDateTime& Add(const wxTimeSpan& diff);
// add a time span (positive or negative)
inline wxDateTime& operator+=(const wxTimeSpan& diff);
inline wxDateTime operator+(const wxTimeSpan& ts) const
{
wxDateTime dt(*this);
dt.Add(ts);
return dt;
}
// return the difference of the date with a time span
inline wxDateTime Subtract(const wxTimeSpan& diff) const;
// subtract a time span (positive or negative)
inline wxDateTime& Subtract(const wxTimeSpan& diff);
// subtract a time span (positive or negative)
inline wxDateTime& operator-=(const wxTimeSpan& diff);
inline wxDateTime operator-(const wxTimeSpan& ts) const
{
wxDateTime dt(*this);
dt.Subtract(ts);
return dt;
}
// return the sum of the date with a date span
inline wxDateTime Add(const wxDateSpan& diff) const;
// add a date span (positive or negative)
wxDateTime& Add(const wxDateSpan& diff);
// add a date span (positive or negative)
inline wxDateTime& operator+=(const wxDateSpan& diff);
inline wxDateTime operator+(const wxDateSpan& ds) const
{
wxDateTime dt(*this);
dt.Add(ds);
return dt;
}
// return the difference of the date with a date span
inline wxDateTime Subtract(const wxDateSpan& diff) const;
// subtract a date span (positive or negative)
inline wxDateTime& Subtract(const wxDateSpan& diff);
// subtract a date span (positive or negative)
inline wxDateTime& operator-=(const wxDateSpan& diff);
inline wxDateTime operator-(const wxDateSpan& ds) const
{
wxDateTime dt(*this);
dt.Subtract(ds);
return dt;
}
// return the difference between two dates
inline wxTimeSpan Subtract(const wxDateTime& dt) const;
inline wxTimeSpan operator-(const wxDateTime& dt2) const;
// conversion to/from text
// ------------------------------------------------------------------------
// all conversions functions return true to indicate whether parsing
// succeeded or failed and fill in the provided end iterator, which must
// not be NULL, with the location of the character where the parsing
// stopped (this will be end() of the passed string if everything was
// parsed)
// parse a string in RFC 822 format (found e.g. in mail headers and
// having the form "Wed, 10 Feb 1999 19:07:07 +0100")
bool ParseRfc822Date(const wxString& date,
wxString::const_iterator *end);
// parse a date/time in the given format (see strptime(3)), fill in
// the missing (in the string) fields with the values of dateDef (by
// default, they will not change if they had valid values or will
// default to Today() otherwise)
bool ParseFormat(const wxString& date,
const wxString& format,
const wxDateTime& dateDef,
wxString::const_iterator *end);
bool ParseFormat(const wxString& date,
const wxString& format,
wxString::const_iterator *end)
{
return ParseFormat(date, format, wxDefaultDateTime, end);
}
bool ParseFormat(const wxString& date,
wxString::const_iterator *end)
{
return ParseFormat(date, wxDefaultDateTimeFormat, wxDefaultDateTime, end);
}
// parse a string containing date, time or both in ISO 8601 format
//
// notice that these functions are new in wx 3.0 and so we don't
// provide compatibility overloads for them
bool ParseISODate(const wxString& date)
{
wxString::const_iterator end;
return ParseFormat(date, wxS("%Y-%m-%d"), &end) && end == date.end();
}
bool ParseISOTime(const wxString& time)
{
wxString::const_iterator end;
return ParseFormat(time, wxS("%H:%M:%S"), &end) && end == time.end();
}
bool ParseISOCombined(const wxString& datetime, char sep = 'T')
{
wxString::const_iterator end;
const wxString fmt = wxS("%Y-%m-%d") + wxString(sep) + wxS("%H:%M:%S");
return ParseFormat(datetime, fmt, &end) && end == datetime.end();
}
// parse a string containing the date/time in "free" format, this
// function will try to make an educated guess at the string contents
bool ParseDateTime(const wxString& datetime,
wxString::const_iterator *end);
// parse a string containing the date only in "free" format (less
// flexible than ParseDateTime)
bool ParseDate(const wxString& date,
wxString::const_iterator *end);
// parse a string containing the time only in "free" format
bool ParseTime(const wxString& time,
wxString::const_iterator *end);
// this function accepts strftime()-like format string (default
// argument corresponds to the preferred date and time representation
// for the current locale) and returns the string containing the
// resulting text representation
wxString Format(const wxString& format = wxDefaultDateTimeFormat,
const TimeZone& tz = Local) const;
// preferred date representation for the current locale
wxString FormatDate() const { return Format(wxS("%x")); }
// preferred time representation for the current locale
wxString FormatTime() const { return Format(wxS("%X")); }
// returns the string representing the date in ISO 8601 format
// (YYYY-MM-DD)
wxString FormatISODate() const { return Format(wxS("%Y-%m-%d")); }
// returns the string representing the time in ISO 8601 format
// (HH:MM:SS)
wxString FormatISOTime() const { return Format(wxS("%H:%M:%S")); }
// return the combined date time representation in ISO 8601 format; the
// separator character should be 'T' according to the standard but it
// can also be useful to set it to ' '
wxString FormatISOCombined(char sep = 'T') const
{ return FormatISODate() + sep + FormatISOTime(); }
// backwards compatible versions of the parsing functions: they return an
// object representing the next character following the date specification
// (i.e. the one where the scan had to stop) or a special NULL-like object
// on failure
//
// they're not deprecated because a lot of existing code uses them and
// there is no particular harm in keeping them but you should still prefer
// the versions above in the new code
wxAnyStrPtr ParseRfc822Date(const wxString& date)
{
wxString::const_iterator end;
return ParseRfc822Date(date, &end) ? wxAnyStrPtr(date, end)
: wxAnyStrPtr();
}
wxAnyStrPtr ParseFormat(const wxString& date,
const wxString& format = wxDefaultDateTimeFormat,
const wxDateTime& dateDef = wxDefaultDateTime)
{
wxString::const_iterator end;
return ParseFormat(date, format, dateDef, &end) ? wxAnyStrPtr(date, end)
: wxAnyStrPtr();
}
wxAnyStrPtr ParseDateTime(const wxString& datetime)
{
wxString::const_iterator end;
return ParseDateTime(datetime, &end) ? wxAnyStrPtr(datetime, end)
: wxAnyStrPtr();
}
wxAnyStrPtr ParseDate(const wxString& date)
{
wxString::const_iterator end;
return ParseDate(date, &end) ? wxAnyStrPtr(date, end)
: wxAnyStrPtr();
}
wxAnyStrPtr ParseTime(const wxString& time)
{
wxString::const_iterator end;
return ParseTime(time, &end) ? wxAnyStrPtr(time, end)
: wxAnyStrPtr();
}
// implementation
// ------------------------------------------------------------------------
// construct from internal representation
wxDateTime(const wxLongLong& time) { m_time = time; }
// get the internal representation
inline wxLongLong GetValue() const;
// a helper function to get the current time_t
static time_t GetTimeNow() { return time(NULL); }
// another one to get the current time broken down
static struct tm *GetTmNow()
{
static struct tm l_CurrentTime;
return GetTmNow(&l_CurrentTime);
}
// get current time using thread-safe function
static struct tm *GetTmNow(struct tm *tmstruct);
private:
// the current country - as it's the same for all program objects (unless
// it runs on a _really_ big cluster system :-), this is a static member:
// see SetCountry() and GetCountry()
static Country ms_country;
// this constant is used to transform a time_t value to the internal
// representation, as time_t is in seconds and we use milliseconds it's
// fixed to 1000
static const long TIME_T_FACTOR;
// returns true if we fall in range in which we can use standard ANSI C
// functions
inline bool IsInStdRange() const;
// the internal representation of the time is the amount of milliseconds
// elapsed since the origin which is set by convention to the UNIX/C epoch
// value: the midnight of January 1, 1970 (UTC)
wxLongLong m_time;
};
// ----------------------------------------------------------------------------
// This class contains a difference between 2 wxDateTime values, so it makes
// sense to add it to wxDateTime and it is the result of subtraction of 2
// objects of that class. See also wxDateSpan.
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxTimeSpan
{
public:
// constructors
// ------------------------------------------------------------------------
// return the timespan for the given number of milliseconds
static wxTimeSpan Milliseconds(wxLongLong ms) { return wxTimeSpan(0, 0, 0, ms); }
static wxTimeSpan Millisecond() { return Milliseconds(1); }
// return the timespan for the given number of seconds
static wxTimeSpan Seconds(wxLongLong sec) { return wxTimeSpan(0, 0, sec); }
static wxTimeSpan Second() { return Seconds(1); }
// return the timespan for the given number of minutes
static wxTimeSpan Minutes(long min) { return wxTimeSpan(0, min, 0 ); }
static wxTimeSpan Minute() { return Minutes(1); }
// return the timespan for the given number of hours
static wxTimeSpan Hours(long hours) { return wxTimeSpan(hours, 0, 0); }
static wxTimeSpan Hour() { return Hours(1); }
// return the timespan for the given number of days
static wxTimeSpan Days(long days) { return Hours(24 * days); }
static wxTimeSpan Day() { return Days(1); }
// return the timespan for the given number of weeks
static wxTimeSpan Weeks(long days) { return Days(7 * days); }
static wxTimeSpan Week() { return Weeks(1); }
// default ctor constructs the 0 time span
wxTimeSpan() { }
// from separate values for each component, date set to 0 (hours are
// not restricted to 0..24 range, neither are minutes, seconds or
// milliseconds)
inline wxTimeSpan(long hours,
long minutes = 0,
wxLongLong seconds = 0,
wxLongLong milliseconds = 0);
// default copy ctor is ok
// no dtor
// arithmetics with time spans (see also below for more operators)
// ------------------------------------------------------------------------
// return the sum of two timespans
inline wxTimeSpan Add(const wxTimeSpan& diff) const;
// add two timespans together
inline wxTimeSpan& Add(const wxTimeSpan& diff);
// add two timespans together
wxTimeSpan& operator+=(const wxTimeSpan& diff) { return Add(diff); }
inline wxTimeSpan operator+(const wxTimeSpan& ts) const
{
return wxTimeSpan(GetValue() + ts.GetValue());
}
// return the difference of two timespans
inline wxTimeSpan Subtract(const wxTimeSpan& diff) const;
// subtract another timespan
inline wxTimeSpan& Subtract(const wxTimeSpan& diff);
// subtract another timespan
wxTimeSpan& operator-=(const wxTimeSpan& diff) { return Subtract(diff); }
inline wxTimeSpan operator-(const wxTimeSpan& ts)
{
return wxTimeSpan(GetValue() - ts.GetValue());
}
// multiply timespan by a scalar
inline wxTimeSpan Multiply(int n) const;
// multiply timespan by a scalar
inline wxTimeSpan& Multiply(int n);
// multiply timespan by a scalar
wxTimeSpan& operator*=(int n) { return Multiply(n); }
inline wxTimeSpan operator*(int n) const
{
return wxTimeSpan(*this).Multiply(n);
}
// return this timespan with opposite sign
wxTimeSpan Negate() const { return wxTimeSpan(-GetValue()); }
// negate the value of the timespan
wxTimeSpan& Neg() { m_diff = -GetValue(); return *this; }
// negate the value of the timespan
wxTimeSpan& operator-() { return Neg(); }
// return the absolute value of the timespan: does _not_ modify the
// object
inline wxTimeSpan Abs() const;
// there is intentionally no division because we don't want to
// introduce rounding errors in time calculations
// comparaison (see also operator versions below)
// ------------------------------------------------------------------------
// is the timespan null?
bool IsNull() const { return m_diff == 0l; }
// returns true if the timespan is null
bool operator!() const { return !IsNull(); }
// is the timespan positive?
bool IsPositive() const { return m_diff > 0l; }
// is the timespan negative?
bool IsNegative() const { return m_diff < 0l; }
// are two timespans equal?
inline bool IsEqualTo(const wxTimeSpan& ts) const;
// compare two timestamps: works with the absolute values, i.e. -2
// hours is longer than 1 hour. Also, it will return false if the
// timespans are equal in absolute value.
inline bool IsLongerThan(const wxTimeSpan& ts) const;
// compare two timestamps: works with the absolute values, i.e. 1
// hour is shorter than -2 hours. Also, it will return false if the
// timespans are equal in absolute value.
bool IsShorterThan(const wxTimeSpan& t) const;
inline bool operator<(const wxTimeSpan &ts) const
{
return GetValue() < ts.GetValue();
}
inline bool operator<=(const wxTimeSpan &ts) const
{
return GetValue() <= ts.GetValue();
}
inline bool operator>(const wxTimeSpan &ts) const
{
return GetValue() > ts.GetValue();
}
inline bool operator>=(const wxTimeSpan &ts) const
{
return GetValue() >= ts.GetValue();
}
inline bool operator==(const wxTimeSpan &ts) const
{
return GetValue() == ts.GetValue();
}
inline bool operator!=(const wxTimeSpan &ts) const
{
return GetValue() != ts.GetValue();
}
// breaking into days, hours, minutes and seconds
// ------------------------------------------------------------------------
// get the max number of weeks in this timespan
inline int GetWeeks() const;
// get the max number of days in this timespan
inline int GetDays() const;
// get the max number of hours in this timespan
inline int GetHours() const;
// get the max number of minutes in this timespan
inline int GetMinutes() const;
// get the max number of seconds in this timespan
inline wxLongLong GetSeconds() const;
// get the number of milliseconds in this timespan
wxLongLong GetMilliseconds() const { return m_diff; }
// conversion to text
// ------------------------------------------------------------------------
// this function accepts strftime()-like format string (default
// argument corresponds to the preferred date and time representation
// for the current locale) and returns the string containing the
// resulting text representation. Notice that only some of format
// specifiers valid for wxDateTime are valid for wxTimeSpan: hours,
// minutes and seconds make sense, but not "PM/AM" string for example.
wxString Format(const wxString& format = wxDefaultTimeSpanFormat) const;
// implementation
// ------------------------------------------------------------------------
// construct from internal representation
wxTimeSpan(const wxLongLong& diff) { m_diff = diff; }
// get the internal representation
wxLongLong GetValue() const { return m_diff; }
private:
// the (signed) time span in milliseconds
wxLongLong m_diff;
};
// ----------------------------------------------------------------------------
// This class is a "logical time span" and is useful for implementing program
// logic for such things as "add one month to the date" which, in general,
// doesn't mean to add 60*60*24*31 seconds to it, but to take the same date
// the next month (to understand that this is indeed different consider adding
// one month to Feb, 15 - we want to get Mar, 15, of course).
//
// When adding a month to the date, all lesser components (days, hours, ...)
// won't be changed unless the resulting date would be invalid: for example,
// Jan 31 + 1 month will be Feb 28, not (non existing) Feb 31.
//
// Because of this feature, adding and subtracting back again the same
// wxDateSpan will *not*, in general give back the original date: Feb 28 - 1
// month will be Jan 28, not Jan 31!
//
// wxDateSpan can be either positive or negative. They may be
// multiplied by scalars which multiply all deltas by the scalar: i.e. 2*(1
// month and 1 day) is 2 months and 2 days. They can be added together and
// with wxDateTime or wxTimeSpan, but the type of result is different for each
// case.
//
// Beware about weeks: if you specify both weeks and days, the total number of
// days added will be 7*weeks + days! See also GetTotalDays() function.
//
// Equality operators are defined for wxDateSpans. Two datespans are equal if
// they both give the same target date when added to *every* source date.
// Thus wxDateSpan::Months(1) is not equal to wxDateSpan::Days(30), because
// they not give the same date when added to 1 Feb. But wxDateSpan::Days(14) is
// equal to wxDateSpan::Weeks(2)
//
// Finally, notice that for adding hours, minutes &c you don't need this
// class: wxTimeSpan will do the job because there are no subtleties
// associated with those.
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxDateSpan
{
public:
// constructors
// ------------------------------------------------------------------------
// this many years/months/weeks/days
wxDateSpan(int years = 0, int months = 0, int weeks = 0, int days = 0)
{
m_years = years;
m_months = months;
m_weeks = weeks;
m_days = days;
}
// get an object for the given number of days
static wxDateSpan Days(int days) { return wxDateSpan(0, 0, 0, days); }
static wxDateSpan Day() { return Days(1); }
// get an object for the given number of weeks
static wxDateSpan Weeks(int weeks) { return wxDateSpan(0, 0, weeks, 0); }
static wxDateSpan Week() { return Weeks(1); }
// get an object for the given number of months
static wxDateSpan Months(int mon) { return wxDateSpan(0, mon, 0, 0); }
static wxDateSpan Month() { return Months(1); }
// get an object for the given number of years
static wxDateSpan Years(int years) { return wxDateSpan(years, 0, 0, 0); }
static wxDateSpan Year() { return Years(1); }
// default copy ctor is ok
// no dtor
// accessors (all SetXXX() return the (modified) wxDateSpan object)
// ------------------------------------------------------------------------
// set number of years
wxDateSpan& SetYears(int n) { m_years = n; return *this; }
// set number of months
wxDateSpan& SetMonths(int n) { m_months = n; return *this; }
// set number of weeks
wxDateSpan& SetWeeks(int n) { m_weeks = n; return *this; }
// set number of days
wxDateSpan& SetDays(int n) { m_days = n; return *this; }
// get number of years
int GetYears() const { return m_years; }
// get number of months
int GetMonths() const { return m_months; }
// get number of weeks
int GetWeeks() const { return m_weeks; }
// get number of days
int GetDays() const { return m_days; }
// returns 7*GetWeeks() + GetDays()
int GetTotalDays() const { return 7*m_weeks + m_days; }
// arithmetics with date spans (see also below for more operators)
// ------------------------------------------------------------------------
// return sum of two date spans
inline wxDateSpan Add(const wxDateSpan& other) const;
// add another wxDateSpan to us
inline wxDateSpan& Add(const wxDateSpan& other);
// add another wxDateSpan to us
inline wxDateSpan& operator+=(const wxDateSpan& other);
inline wxDateSpan operator+(const wxDateSpan& ds) const
{
return wxDateSpan(GetYears() + ds.GetYears(),
GetMonths() + ds.GetMonths(),
GetWeeks() + ds.GetWeeks(),
GetDays() + ds.GetDays());
}
// return difference of two date spans
inline wxDateSpan Subtract(const wxDateSpan& other) const;
// subtract another wxDateSpan from us
inline wxDateSpan& Subtract(const wxDateSpan& other);
// subtract another wxDateSpan from us
inline wxDateSpan& operator-=(const wxDateSpan& other);
inline wxDateSpan operator-(const wxDateSpan& ds) const
{
return wxDateSpan(GetYears() - ds.GetYears(),
GetMonths() - ds.GetMonths(),
GetWeeks() - ds.GetWeeks(),
GetDays() - ds.GetDays());
}
// return a copy of this time span with changed sign
inline wxDateSpan Negate() const;
// inverse the sign of this timespan
inline wxDateSpan& Neg();
// inverse the sign of this timespan
wxDateSpan& operator-() { return Neg(); }
// return the date span proportional to this one with given factor
inline wxDateSpan Multiply(int factor) const;
// multiply all components by a (signed) number
inline wxDateSpan& Multiply(int factor);
// multiply all components by a (signed) number
inline wxDateSpan& operator*=(int factor) { return Multiply(factor); }
inline wxDateSpan operator*(int n) const
{
return wxDateSpan(*this).Multiply(n);
}
// ds1 == d2 if and only if for every wxDateTime t t + ds1 == t + ds2
inline bool operator==(const wxDateSpan& ds) const
{
return GetYears() == ds.GetYears() &&
GetMonths() == ds.GetMonths() &&
GetTotalDays() == ds.GetTotalDays();
}
inline bool operator!=(const wxDateSpan& ds) const
{
return !(*this == ds);
}
private:
int m_years,
m_months,
m_weeks,
m_days;
};
// ----------------------------------------------------------------------------
// wxDateTimeArray: array of dates.
// ----------------------------------------------------------------------------
WX_DECLARE_USER_EXPORTED_OBJARRAY(wxDateTime, wxDateTimeArray, WXDLLIMPEXP_BASE);
// ----------------------------------------------------------------------------
// wxDateTimeHolidayAuthority: an object of this class will decide whether a
// given date is a holiday and is used by all functions working with "work
// days".
//
// NB: the base class is an ABC, derived classes must implement the pure
// virtual methods to work with the holidays they correspond to.
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_FWD_BASE wxDateTimeHolidayAuthority;
WX_DEFINE_USER_EXPORTED_ARRAY_PTR(wxDateTimeHolidayAuthority *,
wxHolidayAuthoritiesArray,
class WXDLLIMPEXP_BASE);
class wxDateTimeHolidaysModule;
class WXDLLIMPEXP_BASE wxDateTimeHolidayAuthority
{
friend class wxDateTimeHolidaysModule;
public:
// returns true if the given date is a holiday
static bool IsHoliday(const wxDateTime& dt);
// fills the provided array with all holidays in the given range, returns
// the number of them
static size_t GetHolidaysInRange(const wxDateTime& dtStart,
const wxDateTime& dtEnd,
wxDateTimeArray& holidays);
// clear the list of holiday authorities
static void ClearAllAuthorities();
// add a new holiday authority (the pointer will be deleted by
// wxDateTimeHolidayAuthority)
static void AddAuthority(wxDateTimeHolidayAuthority *auth);
// the base class must have a virtual dtor
virtual ~wxDateTimeHolidayAuthority();
protected:
// this function is called to determine whether a given day is a holiday
virtual bool DoIsHoliday(const wxDateTime& dt) const = 0;
// this function should fill the array with all holidays between the two
// given dates - it is implemented in the base class, but in a very
// inefficient way (it just iterates over all days and uses IsHoliday() for
// each of them), so it must be overridden in the derived class where the
// base class version may be explicitly used if needed
//
// returns the number of holidays in the given range and fills holidays
// array
virtual size_t DoGetHolidaysInRange(const wxDateTime& dtStart,
const wxDateTime& dtEnd,
wxDateTimeArray& holidays) const = 0;
private:
// all holiday authorities
static wxHolidayAuthoritiesArray ms_authorities;
};
// the holidays for this class are all Saturdays and Sundays
class WXDLLIMPEXP_BASE wxDateTimeWorkDays : public wxDateTimeHolidayAuthority
{
protected:
virtual bool DoIsHoliday(const wxDateTime& dt) const;
virtual size_t DoGetHolidaysInRange(const wxDateTime& dtStart,
const wxDateTime& dtEnd,
wxDateTimeArray& holidays) const;
};
// ============================================================================
// inline functions implementation
// ============================================================================
// ----------------------------------------------------------------------------
// private macros
// ----------------------------------------------------------------------------
#define MILLISECONDS_PER_DAY 86400000l
// some broken compilers (HP-UX CC) refuse to compile the "normal" version, but
// using a temp variable always might prevent other compilers from optimising
// it away - hence use of this ugly macro
#ifndef __HPUX__
#define MODIFY_AND_RETURN(op) return wxDateTime(*this).op
#else
#define MODIFY_AND_RETURN(op) wxDateTime dt(*this); dt.op; return dt
#endif
// ----------------------------------------------------------------------------
// wxDateTime construction
// ----------------------------------------------------------------------------
inline bool wxDateTime::IsInStdRange() const
{
// currently we don't know what is the real type of time_t so prefer to err
// on the safe side and limit it to 32 bit values which is safe everywhere
return m_time >= 0l && (m_time / TIME_T_FACTOR) < wxINT32_MAX;
}
/* static */
inline wxDateTime wxDateTime::Now()
{
struct tm tmstruct;
return wxDateTime(*GetTmNow(&tmstruct));
}
/* static */
inline wxDateTime wxDateTime::Today()
{
wxDateTime dt(Now());
dt.ResetTime();
return dt;
}
#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
inline wxDateTime& wxDateTime::Set(time_t timet)
{
// assign first to avoid long multiplication overflow!
m_time = timet - WX_TIME_BASE_OFFSET ;
m_time *= TIME_T_FACTOR;
return *this;
}
#endif
inline wxDateTime& wxDateTime::SetToCurrent()
{
*this = Now();
return *this;
}
#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
inline wxDateTime::wxDateTime(time_t timet)
{
Set(timet);
}
#endif
inline wxDateTime::wxDateTime(const struct tm& tm)
{
Set(tm);
}
inline wxDateTime::wxDateTime(const Tm& tm)
{
Set(tm);
}
inline wxDateTime::wxDateTime(double jdn)
{
Set(jdn);
}
inline wxDateTime& wxDateTime::Set(const Tm& tm)
{
wxASSERT_MSG( tm.IsValid(), wxT("invalid broken down date/time") );
return Set(tm.mday, (Month)tm.mon, tm.year,
tm.hour, tm.min, tm.sec, tm.msec);
}
inline wxDateTime::wxDateTime(wxDateTime_t hour,
wxDateTime_t minute,
wxDateTime_t second,
wxDateTime_t millisec)
{
Set(hour, minute, second, millisec);
}
inline wxDateTime::wxDateTime(wxDateTime_t day,
Month month,
int year,
wxDateTime_t hour,
wxDateTime_t minute,
wxDateTime_t second,
wxDateTime_t millisec)
{
Set(day, month, year, hour, minute, second, millisec);
}
// ----------------------------------------------------------------------------
// wxDateTime accessors
// ----------------------------------------------------------------------------
inline wxLongLong wxDateTime::GetValue() const
{
wxASSERT_MSG( IsValid(), wxT("invalid wxDateTime"));
return m_time;
}
inline time_t wxDateTime::GetTicks() const
{
wxASSERT_MSG( IsValid(), wxT("invalid wxDateTime"));
if ( !IsInStdRange() )
{
return (time_t)-1;
}
return (time_t)((m_time / (long)TIME_T_FACTOR).ToLong()) + WX_TIME_BASE_OFFSET;
}
inline bool wxDateTime::SetToLastWeekDay(WeekDay weekday,
Month month,
int year)
{
return SetToWeekDay(weekday, -1, month, year);
}
inline wxDateTime
wxDateTime::GetWeekDayInSameWeek(WeekDay weekday,
WeekFlags WXUNUSED(flags)) const
{
MODIFY_AND_RETURN( SetToWeekDayInSameWeek(weekday) );
}
inline wxDateTime wxDateTime::GetNextWeekDay(WeekDay weekday) const
{
MODIFY_AND_RETURN( SetToNextWeekDay(weekday) );
}
inline wxDateTime wxDateTime::GetPrevWeekDay(WeekDay weekday) const
{
MODIFY_AND_RETURN( SetToPrevWeekDay(weekday) );
}
inline wxDateTime wxDateTime::GetWeekDay(WeekDay weekday,
int n,
Month month,
int year) const
{
wxDateTime dt(*this);
return dt.SetToWeekDay(weekday, n, month, year) ? dt : wxInvalidDateTime;
}
inline wxDateTime wxDateTime::GetLastWeekDay(WeekDay weekday,
Month month,
int year)
{
wxDateTime dt(*this);
return dt.SetToLastWeekDay(weekday, month, year) ? dt : wxInvalidDateTime;
}
inline wxDateTime wxDateTime::GetLastMonthDay(Month month, int year) const
{
MODIFY_AND_RETURN( SetToLastMonthDay(month, year) );
}
inline wxDateTime wxDateTime::GetYearDay(wxDateTime_t yday) const
{
MODIFY_AND_RETURN( SetToYearDay(yday) );
}
// ----------------------------------------------------------------------------
// wxDateTime comparison
// ----------------------------------------------------------------------------
inline bool wxDateTime::IsEqualTo(const wxDateTime& datetime) const
{
wxASSERT_MSG( IsValid() && datetime.IsValid(), wxT("invalid wxDateTime"));
return m_time == datetime.m_time;
}
inline bool wxDateTime::IsEarlierThan(const wxDateTime& datetime) const
{
wxASSERT_MSG( IsValid() && datetime.IsValid(), wxT("invalid wxDateTime"));
return m_time < datetime.m_time;
}
inline bool wxDateTime::IsLaterThan(const wxDateTime& datetime) const
{
wxASSERT_MSG( IsValid() && datetime.IsValid(), wxT("invalid wxDateTime"));
return m_time > datetime.m_time;
}
inline bool wxDateTime::IsStrictlyBetween(const wxDateTime& t1,
const wxDateTime& t2) const
{
// no need for assert, will be checked by the functions we call
return IsLaterThan(t1) && IsEarlierThan(t2);
}
inline bool wxDateTime::IsBetween(const wxDateTime& t1,
const wxDateTime& t2) const
{
// no need for assert, will be checked by the functions we call
return IsEqualTo(t1) || IsEqualTo(t2) || IsStrictlyBetween(t1, t2);
}
inline bool wxDateTime::IsSameDate(const wxDateTime& dt) const
{
Tm tm1 = GetTm(),
tm2 = dt.GetTm();
return tm1.year == tm2.year &&
tm1.mon == tm2.mon &&
tm1.mday == tm2.mday;
}
inline bool wxDateTime::IsSameTime(const wxDateTime& dt) const
{
// notice that we can't do something like this:
//
// m_time % MILLISECONDS_PER_DAY == dt.m_time % MILLISECONDS_PER_DAY
//
// because we have also to deal with (possibly) different DST settings!
Tm tm1 = GetTm(),
tm2 = dt.GetTm();
return tm1.hour == tm2.hour &&
tm1.min == tm2.min &&
tm1.sec == tm2.sec &&
tm1.msec == tm2.msec;
}
inline bool wxDateTime::IsEqualUpTo(const wxDateTime& dt,
const wxTimeSpan& ts) const
{
return IsBetween(dt.Subtract(ts), dt.Add(ts));
}
// ----------------------------------------------------------------------------
// wxDateTime arithmetics
// ----------------------------------------------------------------------------
inline wxDateTime wxDateTime::Add(const wxTimeSpan& diff) const
{
wxASSERT_MSG( IsValid(), wxT("invalid wxDateTime"));
return wxDateTime(m_time + diff.GetValue());
}
inline wxDateTime& wxDateTime::Add(const wxTimeSpan& diff)
{
wxASSERT_MSG( IsValid(), wxT("invalid wxDateTime"));
m_time += diff.GetValue();
return *this;
}
inline wxDateTime& wxDateTime::operator+=(const wxTimeSpan& diff)
{
return Add(diff);
}
inline wxDateTime wxDateTime::Subtract(const wxTimeSpan& diff) const
{
wxASSERT_MSG( IsValid(), wxT("invalid wxDateTime"));
return wxDateTime(m_time - diff.GetValue());
}
inline wxDateTime& wxDateTime::Subtract(const wxTimeSpan& diff)
{
wxASSERT_MSG( IsValid(), wxT("invalid wxDateTime"));
m_time -= diff.GetValue();
return *this;
}
inline wxDateTime& wxDateTime::operator-=(const wxTimeSpan& diff)
{
return Subtract(diff);
}
inline wxTimeSpan wxDateTime::Subtract(const wxDateTime& datetime) const
{
wxASSERT_MSG( IsValid() && datetime.IsValid(), wxT("invalid wxDateTime"));
return wxTimeSpan(GetValue() - datetime.GetValue());
}
inline wxTimeSpan wxDateTime::operator-(const wxDateTime& dt2) const
{
return this->Subtract(dt2);
}
inline wxDateTime wxDateTime::Add(const wxDateSpan& diff) const
{
return wxDateTime(*this).Add(diff);
}
inline wxDateTime& wxDateTime::Subtract(const wxDateSpan& diff)
{
return Add(diff.Negate());
}
inline wxDateTime wxDateTime::Subtract(const wxDateSpan& diff) const
{
return wxDateTime(*this).Subtract(diff);
}
inline wxDateTime& wxDateTime::operator-=(const wxDateSpan& diff)
{
return Subtract(diff);
}
inline wxDateTime& wxDateTime::operator+=(const wxDateSpan& diff)
{
return Add(diff);
}
// ----------------------------------------------------------------------------
// wxDateTime and timezones
// ----------------------------------------------------------------------------
inline wxDateTime
wxDateTime::ToTimezone(const wxDateTime::TimeZone& tz, bool noDST) const
{
MODIFY_AND_RETURN( MakeTimezone(tz, noDST) );
}
inline wxDateTime
wxDateTime::FromTimezone(const wxDateTime::TimeZone& tz, bool noDST) const
{
MODIFY_AND_RETURN( MakeFromTimezone(tz, noDST) );
}
// ----------------------------------------------------------------------------
// wxTimeSpan construction
// ----------------------------------------------------------------------------
inline wxTimeSpan::wxTimeSpan(long hours,
long minutes,
wxLongLong seconds,
wxLongLong milliseconds)
{
// assign first to avoid precision loss
m_diff = hours;
m_diff *= 60l;
m_diff += minutes;
m_diff *= 60l;
m_diff += seconds;
m_diff *= 1000l;
m_diff += milliseconds;
}
// ----------------------------------------------------------------------------
// wxTimeSpan accessors
// ----------------------------------------------------------------------------
inline wxLongLong wxTimeSpan::GetSeconds() const
{
return m_diff / 1000l;
}
inline int wxTimeSpan::GetMinutes() const
{
// explicit cast to int suppresses a warning with CodeWarrior and possibly
// others (changing the return type to long from int is impossible in 2.8)
return (int)((GetSeconds() / 60l).GetLo());
}
inline int wxTimeSpan::GetHours() const
{
return GetMinutes() / 60;
}
inline int wxTimeSpan::GetDays() const
{
return GetHours() / 24;
}
inline int wxTimeSpan::GetWeeks() const
{
return GetDays() / 7;
}
// ----------------------------------------------------------------------------
// wxTimeSpan arithmetics
// ----------------------------------------------------------------------------
inline wxTimeSpan wxTimeSpan::Add(const wxTimeSpan& diff) const
{
return wxTimeSpan(m_diff + diff.GetValue());
}
inline wxTimeSpan& wxTimeSpan::Add(const wxTimeSpan& diff)
{
m_diff += diff.GetValue();
return *this;
}
inline wxTimeSpan wxTimeSpan::Subtract(const wxTimeSpan& diff) const
{
return wxTimeSpan(m_diff - diff.GetValue());
}
inline wxTimeSpan& wxTimeSpan::Subtract(const wxTimeSpan& diff)
{
m_diff -= diff.GetValue();
return *this;
}
inline wxTimeSpan& wxTimeSpan::Multiply(int n)
{
m_diff *= (long)n;
return *this;
}
inline wxTimeSpan wxTimeSpan::Multiply(int n) const
{
return wxTimeSpan(m_diff * (long)n);
}
inline wxTimeSpan wxTimeSpan::Abs() const
{
return wxTimeSpan(GetValue().Abs());
}
inline bool wxTimeSpan::IsEqualTo(const wxTimeSpan& ts) const
{
return GetValue() == ts.GetValue();
}
inline bool wxTimeSpan::IsLongerThan(const wxTimeSpan& ts) const
{
return GetValue().Abs() > ts.GetValue().Abs();
}
inline bool wxTimeSpan::IsShorterThan(const wxTimeSpan& ts) const
{
return GetValue().Abs() < ts.GetValue().Abs();
}
// ----------------------------------------------------------------------------
// wxDateSpan
// ----------------------------------------------------------------------------
inline wxDateSpan& wxDateSpan::operator+=(const wxDateSpan& other)
{
m_years += other.m_years;
m_months += other.m_months;
m_weeks += other.m_weeks;
m_days += other.m_days;
return *this;
}
inline wxDateSpan& wxDateSpan::Add(const wxDateSpan& other)
{
return *this += other;
}
inline wxDateSpan wxDateSpan::Add(const wxDateSpan& other) const
{
wxDateSpan ds(*this);
ds.Add(other);
return ds;
}
inline wxDateSpan& wxDateSpan::Multiply(int factor)
{
m_years *= factor;
m_months *= factor;
m_weeks *= factor;
m_days *= factor;
return *this;
}
inline wxDateSpan wxDateSpan::Multiply(int factor) const
{
wxDateSpan ds(*this);
ds.Multiply(factor);
return ds;
}
inline wxDateSpan wxDateSpan::Negate() const
{
return wxDateSpan(-m_years, -m_months, -m_weeks, -m_days);
}
inline wxDateSpan& wxDateSpan::Neg()
{
m_years = -m_years;
m_months = -m_months;
m_weeks = -m_weeks;
m_days = -m_days;
return *this;
}
inline wxDateSpan& wxDateSpan::operator-=(const wxDateSpan& other)
{
return *this += other.Negate();
}
inline wxDateSpan& wxDateSpan::Subtract(const wxDateSpan& other)
{
return *this -= other;
}
inline wxDateSpan wxDateSpan::Subtract(const wxDateSpan& other) const
{
wxDateSpan ds(*this);
ds.Subtract(other);
return ds;
}
#undef MILLISECONDS_PER_DAY
#undef MODIFY_AND_RETURN
// ============================================================================
// binary operators
// ============================================================================
// ----------------------------------------------------------------------------
// wxTimeSpan operators
// ----------------------------------------------------------------------------
wxTimeSpan WXDLLIMPEXP_BASE operator*(int n, const wxTimeSpan& ts);
// ----------------------------------------------------------------------------
// wxDateSpan
// ----------------------------------------------------------------------------
wxDateSpan WXDLLIMPEXP_BASE operator*(int n, const wxDateSpan& ds);
// ============================================================================
// other helper functions
// ============================================================================
// ----------------------------------------------------------------------------
// iteration helpers: can be used to write a for loop over enum variable like
// this:
// for ( m = wxDateTime::Jan; m < wxDateTime::Inv_Month; wxNextMonth(m) )
// ----------------------------------------------------------------------------
WXDLLIMPEXP_BASE void wxNextMonth(wxDateTime::Month& m);
WXDLLIMPEXP_BASE void wxPrevMonth(wxDateTime::Month& m);
WXDLLIMPEXP_BASE void wxNextWDay(wxDateTime::WeekDay& wd);
WXDLLIMPEXP_BASE void wxPrevWDay(wxDateTime::WeekDay& wd);
#endif // wxUSE_DATETIME
#endif // _WX_DATETIME_H
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