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wxWidgets/include/wx/datetime.h
Vadim Zeitlin 299fcbfe98 more timezone stuff - it's a miracle, but it seems to work 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4896 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1999-12-10 20:44:37 +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 license
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_DATETIME_H
#define _WX_DATETIME_H
#ifdef __GNUG__
#pragma interface "datetime.h"
#endif
#include <time.h>
#include <limits.h> // for INT_MIN
#include "wx/longlong.h"
class WXDLLEXPORT wxDateTime;
class WXDLLEXPORT wxTimeSpan;
class WXDLLEXPORT wxDateSpan;
// don't use inline functions in debug builds - we don't care about
// performances and this only leads to increased rebuild time (because every
// time an inline method is changed, all files including the header must be
// rebuilt)
#ifdef __WXDEBUG__
#define inline
#endif // Debug
/*
* TODO Well, everything :-)
*
* + 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
*/
/*
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
substraction
------------
wxDateTime - wxDateTime = wxTimeSpan
wxTimeSpan - wxTimeSpan = wxTimeSpan
wxDateSpan - wxDateSpan = wxDateSpan
multiplication
--------------
wxTimeSpan * number = wxTimeSpan
wxDateSpan * number = wxDateSpan
unitary minus
-------------
-wxTimeSpan = wxTimeSpan
-wxDateSpan = wxDateSpan
*/
// ----------------------------------------------------------------------------
// This class represents an absolute moment in the time
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxDateTime
{
public:
// types
// ------------------------------------------------------------------------
// a small unsigned integer type for storing things like seconds, days
// of the week, &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;
// 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,
// 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 = GMT12 + 1, // Central Standard Time (+9.5)
A_EST = GMT10, // Eastern Standard Time
A_ESST = GMT11, // Eastern Summer 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 T<>ndering, 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
enum Country
{
Country_Unknown, // no special information for this country
Country_Default, // set the default country with SetCountry() method
// TODO add more countries (for this we must know about DST and/or
// holidays for this country)
France,
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
};
// helper classes
// ------------------------------------------------------------------------
// a class representing a time zone: basicly, this is just an offset
// (in seconds) from GMT
class TimeZone
{
public:
TimeZone(TZ tz);
TimeZone(wxDateTime_t offset = 0) { m_offset = offset; }
int GetOffset() const { return m_offset; }
private:
// offset for this timezone from GMT in seconds
int 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 Tm
{
wxDateTime_t msec, sec, min, hour, mday;
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;
// these values can't be accessed directly because they're not always
// computed and we calculate them on demand
wxDateTime_t wday, yday;
};
// static methods
// ------------------------------------------------------------------------
// set the current country
static void SetCountry(Country country);
// get the current country
static inline Country GetCountry();
// 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 = Inv_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, bool abbr = FALSE);
// get the full (default) or abbreviated weekday name in the current
// locale, returns empty string on error
static wxString GetWeekDayName(WeekDay weekday, bool abbr = FALSE);
// 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);
// 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);
// return the wxDateTime object for the current time
static inline wxDateTime Now();
// 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() { }
// from time_t: seconds since the Epoch 00:00:00 UTC, Jan 1, 1970)
inline wxDateTime(time_t timet);
// 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 = Inv_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);
// 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();
// set to given time_t value
inline wxDateTime& Set(time_t timet);
// 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 = Inv_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();
// 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)
// ------------------------------------------------------------------------
// set to Nth occurence 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);
// sets to the last weekday in the given month, year
inline bool SetToLastWeekDay(WeekDay weekday,
Month month = Inv_Month,
int year = Inv_Year);
// 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)
bool SetToTheWeek(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);
// 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;
// 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 correspond to this moment in local
// time. Using the functions below, it may be converted to another time
// zone (for example, the Unix epoch is wxDateTime(1, Jan, 1970).ToGMT())
//
// Converting to the local time zone doesn't do anything.
// ------------------------------------------------------------------------
// transform to any given timezone
inline wxDateTime ToTimezone(const TimeZone& tz) const;
wxDateTime& MakeTimezone(const TimeZone& tz);
// transform to GMT/UTC
wxDateTime ToGMT() const { return ToTimezone(GMT0); }
wxDateTime& MakeGMT() { return MakeTimezone(GMT0); }
// 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 (FALSE for uninitialized objects as well as after
// the functions which failed to convert the date to supported range)
inline bool IsValid() const { return this != &ms_InvDateTime; }
// 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 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, 0 if date is
// invalid)
wxDateTime_t GetWeekOfYear(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 TimeZone& tz = Local) 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 authoiruty 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;
// 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;
// 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 two moments are identical
inline bool operator==(const wxDateTime& datetime) const;
// returns TRUE if the two moments are different
inline bool operator!=(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;
// date operations: for the non-const methods, the return value is this
// object itself (see also functions below for operator versions)
// ------------------------------------------------------------------------
// 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);
// substract a time span (positive or negative)
inline wxDateTime& Substract(const wxTimeSpan& diff);
// substract a time span (positive or negative)
inline wxDateTime& operator-=(const wxTimeSpan& diff);
// 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);
// substract a date span (positive or negative)
inline wxDateTime& Substract(const wxDateSpan& diff);
// substract a date span (positive or negative)
inline wxDateTime& operator-=(const wxDateSpan& diff);
// substract a date (may result in positive or negative time span)
inline wxTimeSpan Substract(const wxDateTime& datetime) const;
// substract a date (may result in positive or negative time span)
inline wxTimeSpan operator-(const wxDateTime& datetime) const;
// conversion to/from text: all conversions from text return TRUE on
// success or FALSE if the date is malformed/out of supported range
// ------------------------------------------------------------------------
// 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);
// parse a date/time in the given format (see strptime(3))
bool ParseFormat(const wxString& date, const char *format = "%c");
// parse a string containing the date/time in "free" format, this
// function will try to make an educated guess at the string contents
// (and return FALSE if it fails)
bool ParseDateTime(const wxString& date);
// 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 wxChar *format = _T("%c"),
const TimeZone& tz = Local) const;
// preferred date representation for the current locale
wxString FormatDate() const { return Format(_T("%x")); }
// preferred time representation for the current locale
wxString FormatTime() const { return Format(_T("%X")); }
// implementation
// ------------------------------------------------------------------------
// get the internal representation
inline wxLongLong GetValue() const;
// a helper function to get the current time_t
static time_t GetTimeNow() { return time((time_t *)NULL); }
// another one to get the current time broken down
static struct tm *GetTmNow()
{
time_t t = GetTimeNow();
return localtime(&t);
}
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 unsigned int TIME_T_FACTOR;
// invalid wxDateTime object - returned by all functions which return
// "wxDateTime &" on failure
static wxDateTime ms_InvDateTime;
// 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 substraction of 2
// objects of that class. See also wxDateSpan.
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxTimeSpan
{
public:
// constructors
// ------------------------------------------------------------------------
// return the timespan for the given number of seconds
static wxTimeSpan Seconds(int sec) { return wxTimeSpan(0, 0, sec); }
// return the timespan for the given number of minutes
static wxTimeSpan Minutes(int min) { return wxTimeSpan(0, min, 0 ); }
// return the timespan for the given number of hours
static wxTimeSpan Hours(int hours) { return wxTimeSpan(hours, 0, 0); }
// 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(int hours,
int minutes = 0,
int seconds = 0,
int milliseconds = 0);
// from internal representation
wxTimeSpan(wxLongLong diff) : m_diff(diff) { }
// default copy ctor is ok
// no dtor
// arithmetics with time spans
// ------------------------------------------------------------------------
// add two timespans together
inline wxTimeSpan& Add(const wxTimeSpan& diff);
// add two timespans together
wxTimeSpan& operator+=(const wxTimeSpan& diff) { return Add(diff); }
// substract another timespan
inline wxTimeSpan& Substract(const wxTimeSpan& diff);
// substract another timespan
wxTimeSpan& operator-=(const wxTimeSpan& diff) { return Substract(diff); }
// multiply timespan by a scalar
inline wxTimeSpan& Multiply(int n);
// multiply timespan by a scalar
wxTimeSpan& operator*=(int n) { return Multiply(n); }
// multiply timespan by a scalar
inline wxTimeSpan operator*(int n) const;
// return this timespan with inversed 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 { return !IsLongerThan(t); }
// 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 wxChar *format = _T("%c")) const;
// preferred date representation for the current locale
wxString FormatDate() const { return Format(_T("%x")); }
// preferred time representation for the current locale
wxString FormatTime() const { return Format(_T("%X")); }
// implementation
// ------------------------------------------------------------------------
// 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.
//
// 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.
//
// 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 WXDLLEXPORT 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); }
// get an object for the given number of weeks
static wxDateSpan Weeks(int weeks) { return wxDateSpan(0, 0, weeks, 0); }
// get an object for the given number of months
static wxDateSpan Months(int mon) { return wxDateSpan(0, mon, 0, 0); }
// get an object for the given number of years
static wxDateSpan Years(int years) { return wxDateSpan(years, 0, 0, 0); }
// 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
// ------------------------------------------------------------------------
// add another wxDateSpan to us
inline wxDateSpan& Add(const wxDateSpan& other);
// add another wxDateSpan to us
inline wxDateSpan& operator+=(const wxDateSpan& other);
// substract another wxDateSpan from us
inline wxDateSpan& Substract(const wxDateSpan& other);
// substract another wxDateSpan from us
inline wxDateSpan& operator-=(const wxDateSpan& other);
// 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(); }
// multiply all components by a (signed) number
inline wxDateSpan& operator*=(int factor);
private:
int m_years,
m_months,
m_weeks,
m_days;
};
WXDLLEXPORT_DATA(extern wxDateSpan) wxYear;
WXDLLEXPORT_DATA(extern wxDateSpan) wxMonth;
WXDLLEXPORT_DATA(extern wxDateSpan) wxWeek;
WXDLLEXPORT_DATA(extern wxDateSpan) wxDay;
// ============================================================================
// inline functions implementation
// ============================================================================
// don't include inline functions definitions when we're included from anything
// else than datetime.cpp in debug builds: this minimizes rebuilds if we change
// some inline function and the performance doesn't matter in the debug builds.
#if !defined(__WXDEBUG__) || defined(wxDEFINE_TIME_CONSTANTS)
#define INCLUDED_FROM_WX_DATETIME_H
#include "wx/datetime.inl"
#undef INCLUDED_FROM_WX_DATETIME_H
#endif
// if we defined it to be empty above, restore it now
#undef inline
// ============================================================================
// binary operators
// ============================================================================
// ----------------------------------------------------------------------------
// wxDateTime operators
// ----------------------------------------------------------------------------
inline bool WXDLLEXPORT operator<(const wxDateTime &t1, const wxDateTime &t2)
{
wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
return t1.GetValue() < t2.GetValue();
}
inline bool WXDLLEXPORT operator<=(const wxDateTime &t1, const wxDateTime &t2)
{
wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
return t1.GetValue() <= t2.GetValue();
}
inline bool WXDLLEXPORT operator>(const wxDateTime &t1, const wxDateTime &t2)
{
wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
return t1.GetValue() > t2.GetValue();
}
inline bool WXDLLEXPORT operator>=(const wxDateTime &t1, const wxDateTime &t2)
{
wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
return t1.GetValue() >= t2.GetValue();
}
inline bool WXDLLEXPORT operator==(const wxDateTime &t1, const wxDateTime &t2)
{
wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
return t1.GetValue() == t2.GetValue();
}
inline bool WXDLLEXPORT operator!=(const wxDateTime &t1, const wxDateTime &t2)
{
wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
return t1.GetValue() != t2.GetValue();
}
inline wxTimeSpan WXDLLEXPORT operator-(const wxDateTime &t1,
const wxDateTime &t2)
{
wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
return wxTimeSpan(t1.GetValue() - t2.GetValue());
}
// ----------------------------------------------------------------------------
// wxTimeSpan operators
// ----------------------------------------------------------------------------
inline wxTimeSpan WXDLLEXPORT operator+(const wxTimeSpan& ts1,
const wxTimeSpan& ts2)
{
return wxTimeSpan(ts1.GetValue() + ts2.GetValue());
}
inline wxTimeSpan WXDLLEXPORT operator-(const wxTimeSpan& ts1,
const wxTimeSpan& ts2)
{
return wxTimeSpan(ts1.GetValue() - ts2.GetValue());
}
inline bool WXDLLEXPORT operator<(const wxTimeSpan &t1, const wxTimeSpan &t2)
{
return t1.GetValue() < t2.GetValue();
}
inline bool WXDLLEXPORT operator<=(const wxTimeSpan &t1, const wxTimeSpan &t2)
{
return t1.GetValue() <= t2.GetValue();
}
inline bool WXDLLEXPORT operator>(const wxTimeSpan &t1, const wxTimeSpan &t2)
{
return t1.GetValue() > t2.GetValue();
}
inline bool WXDLLEXPORT operator>=(const wxTimeSpan &t1, const wxTimeSpan &t2)
{
return t1.GetValue() >= t2.GetValue();
}
inline bool WXDLLEXPORT operator==(const wxTimeSpan &t1, const wxTimeSpan &t2)
{
return t1.GetValue() == t2.GetValue();
}
inline bool WXDLLEXPORT operator!=(const wxTimeSpan &t1, const wxTimeSpan &t2)
{
return t1.GetValue() != t2.GetValue();
}
// ----------------------------------------------------------------------------
// wxDateSpan
// ----------------------------------------------------------------------------
inline WXDLLEXPORT wxDateSpan operator+(const wxDateSpan& rt1,
const wxDateSpan& rt2)
{
return wxDateSpan(rt1.GetYears() + rt2.GetYears(),
rt1.GetMonths() + rt2.GetMonths(),
rt1.GetWeeks() + rt2.GetWeeks(),
rt1.GetDays() + rt2.GetDays());
}
#endif // _WX_DATETIME_H
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