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wxWidgets/include/wx/datetime.h
Vadim Zeitlin d98a58c543 Use __WINDOWS__ for OS kind checks and reserve __WXMSW__ for GUI toolkit. 
This change prepares the way for using wxGTK under Windows as this would
still define __WINDOWS__ but use __WXGTK__ instead of __WXMSW__.

Closes #14064.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70796 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2012-03-04 00:29:31 +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"
#else
#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 __WINDOWS__
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
*/
/*
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 (= Greenwich 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 __WINDOWS__
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 __WINDOWS__
// 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 // __WINDOWS__
// 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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