#include <wx/datetime.h>

Detailed Description

wxDateTime class represents an absolute moment in time.

The type wxDateTime_t is typedefed as unsigned short and is used to contain the number of years, hours, minutes, seconds and milliseconds.

Global constant wxDefaultDateTime and synonym for it wxInvalidDateTime are defined. This constant will be different from any valid wxDateTime object.

Static Functions

All static functions either set or return the static variables of wxDateSpan (the country), return the current moment, year, month or number of days in it, or do some general calendar-related actions.

Please note that although several function accept an extra Calendar parameter, it is currently ignored as only the Gregorian calendar is supported. Future versions will support other calendars.

Date Formatting and Parsing

The date formatting and parsing functions convert wxDateTime objects to and from text. The conversions to text are mostly trivial: you can either do it using the default date and time representations for the current locale (FormatDate() and FormatTime()), using the international standard representation defined by ISO 8601 (FormatISODate(), FormatISOTime() and FormatISOCombined()) or by specifying any format at all and using Format() directly.

The conversions from text are more interesting, as there are much more possibilities to care about. The simplest cases can be taken care of with ParseFormat() which can parse any date in the given (rigid) format. ParseRfc822Date() is another function for parsing dates in predefined format – the one of RFC 822 which (still...) defines the format of email messages on the Internet. This format cannot be described with strptime(3)-like format strings used by Format(), hence the need for a separate function.

But the most interesting functions are ParseTime(), ParseDate() and ParseDateTime(). They try to parse the date and time (or only one of them) in 'free' format, i.e. allow them to be specified in any of possible ways. These functions will usually be used to parse the (interactive) user input which is not bound to be in any predefined format. As an example, ParseDate() can parse the strings such as "tomorrow", "March first" and even "next Sunday".

Finally notice that each of the parsing functions is available in several overloads: if the input string is a narrow (char *) string, then a narrow pointer is returned. If the input string is a wide string, a wide char pointer is returned. Finally, if the input parameter is a wxString, a narrow char pointer is also returned for backwards compatibility but there is also an additional argument of wxString::const_iterator type in which, if it is not NULL, an iterator pointing to the end of the scanned string part is returned.

Library: wxBase

Category: Data Structures

Predefined objects/pointers:

wxDefaultDateTime

See Also: Date and Time, wxTimeSpan, wxDateSpan, wxCalendarCtrl

Classes
class	TimeZone
	Class representing a time zone. More...

struct	Tm
	Contains broken down date-time representation. More...

Public Types
enum	TZ { Local, 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, WET = GMT0, WEST = GMT1, CET = GMT1, CEST = GMT2, EET = GMT2, EEST = GMT3, MSK = GMT3, MSD = GMT4, AST = GMT_4, ADT = GMT_3, EST = GMT_5, EDT = GMT_4, CST = GMT_6, CDT = GMT_5, MST = GMT_7, MDT = GMT_6, PST = GMT_8, PDT = GMT_7, HST = GMT_10, AKST = GMT_9, AKDT = GMT_8, A_WST = GMT8, A_CST = GMT13 + 1, A_EST = GMT10, A_ESST = GMT11, NZST = GMT12, NZDT = GMT13, UTC = GMT0 }
	Time zone symbolic names. More...

enum	Calendar { Gregorian, Julian }
	Several functions accept an extra parameter specifying the calendar to use (although most of them only support now the Gregorian calendar). More...

enum	Country { Country_Unknown, Country_Default, Country_WesternEurope_Start, Country_EEC = Country_WesternEurope_Start, France, Germany, UK, Country_WesternEurope_End = UK, Russia, USA }
	Date calculations often depend on the country and wxDateTime allows to set the country whose conventions should be used using SetCountry(). More...

enum	Month { Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec, Inv_Month }
	symbolic names for the months More...

enum	WeekDay { Sun, Mon, Tue, Wed, Thu, Fri, Sat, Inv_WeekDay }
	symbolic names for the weekdays More...

enum	Year { Inv_Year = SHRT_MIN }
	invalid value for the year More...

enum	NameFlags { Name_Full = 0x01, Name_Abbr = 0x02 }
	Flags to be used with GetMonthName() and GetWeekDayName() functions. More...

enum	WeekFlags { Default_First, Monday_First, Sunday_First }
	Different parts of the world use different conventions for the week start. More...

typedef unsigned short	wxDateTime_t
	A small unsigned integer type for storing things like minutes, seconds &c.

Public Member Functions
Constructors, Assignment Operators and Setters
Constructors and various Set() methods are collected here. If you construct a date object from separate values for day, month and year, you should use IsValid() method to check that the values were correct as constructors cannot return an error code.
	wxDateTime ()
	Default constructor.

	wxDateTime (const wxDateTime &date)
	Copy constructor.

	wxDateTime (time_t timet)
	Same as Set().

	wxDateTime (const struct tm &tm)
	Same as Set().

	wxDateTime (double jdn)
	Same as Set().

	wxDateTime (wxDateTime_t hour, wxDateTime_t minute=0, wxDateTime_t second=0, wxDateTime_t millisec=0)
	Same as Set().

	wxDateTime (wxDateTime_t day, Month month, int year=Inv_Year, wxDateTime_t hour=0, wxDateTime_t minute=0, wxDateTime_t second=0, wxDateTime_t millisec=0)
	Same as Set().

	wxDateTime (const struct _SYSTEMTIME &st)
	Same as SetFromMSWSysTime.

wxDateTime &	ResetTime ()
	Reset time to midnight (00:00:00) without changing the date.

wxDateTime &	Set (time_t timet)
	Constructs the object from timet value holding the number of seconds since Jan 1, 1970 UTC.

wxDateTime &	Set (const struct tm &tm)
	Sets the date and time from the broken down representation in the standard tm structure.

wxDateTime &	Set (const Tm &tm)
	Sets the date and time from the broken down representation in the wxDateTime::Tm structure.

wxDateTime &	Set (double jdn)
	Sets the date from the so-called Julian Day Number.

wxDateTime &	Set (wxDateTime_t hour, wxDateTime_t minute=0, wxDateTime_t second=0, wxDateTime_t millisec=0)
	Sets the date to be equal to Today() and the time from supplied parameters.

wxDateTime &	Set (wxDateTime_t day, Month month, int year=Inv_Year, wxDateTime_t hour=0, wxDateTime_t minute=0, wxDateTime_t second=0, wxDateTime_t millisec=0)
	Sets the date and time from the parameters.

wxDateTime &	SetDay (unsigned short day)
	Sets the day without changing other date components.

wxDateTime &	SetFromDOS (unsigned long ddt)
	Sets the date from the date and time in DOS format.

wxDateTime &	SetHour (unsigned short hour)
	Sets the hour without changing other date components.

wxDateTime &	SetMillisecond (unsigned short millisecond)
	Sets the millisecond without changing other date components.

wxDateTime &	SetMinute (unsigned short minute)
	Sets the minute without changing other date components.

wxDateTime &	SetMonth (Month month)
	Sets the month without changing other date components.

wxDateTime &	SetSecond (unsigned short second)
	Sets the second without changing other date components.

wxDateTime &	SetToCurrent ()
	Sets the date and time of to the current values.

wxDateTime &	SetYear (int year)
	Sets the year without changing other date components.

wxDateTime &	operator= (time_t timet)
	Same as Set().

wxDateTime &	operator= (const struct tm &tm)
	Same as Set().

Accessors
Here are the trivial accessors. Other functions, which might have to perform some more complicated calculations to find the answer are under the "Date Arithmetics" section.
unsigned long	GetAsDOS () const
	Returns the date and time in DOS format.

wxDateTime &	SetFromMSWSysTime (const struct _SYSTEMTIME &st)
	Initialize using the Windows SYSTEMTIME structure.

void	GetAsMSWSysTime (struct _SYSTEMTIME *st) const
	Returns the date and time in the Windows SYSTEMTIME format.

int	GetCentury (const TimeZone &tz=Local) const
	Returns the century of this date.

wxDateTime	GetDateOnly () const
	Returns the object having the same date component as this one but time of 00:00:00.

unsigned short	GetDay (const TimeZone &tz=Local) const
	Returns the day in the given timezone (local one by default).

unsigned short	GetDayOfYear (const TimeZone &tz=Local) const
	Returns the day of the year (in 1-366 range) in the given timezone (local one by default).

unsigned short	GetHour (const TimeZone &tz=Local) const
	Returns the hour in the given timezone (local one by default).

unsigned short	GetMillisecond (const TimeZone &tz=Local) const
	Returns the milliseconds in the given timezone (local one by default).

unsigned short	GetMinute (const TimeZone &tz=Local) const
	Returns the minute in the given timezone (local one by default).

Month	GetMonth (const TimeZone &tz=Local) const
	Returns the month in the given timezone (local one by default).

unsigned short	GetSecond (const TimeZone &tz=Local) const
	Returns the seconds in the given timezone (local one by default).

time_t	GetTicks () const
	Returns the number of seconds since Jan 1, 1970 UTC.

Tm	GetTm (const TimeZone &tz=Local) const
	Returns broken down representation of the date and time.

WeekDay	GetWeekDay (const TimeZone &tz=Local) const
	Returns the week day in the given timezone (local one by default).

wxDateTime_t	GetWeekOfMonth (WeekFlags flags=Monday_First, const TimeZone &tz=Local) const
	Returns the ordinal number of the week in the month (in 1-5 range).

wxDateTime_t	GetWeekOfYear (WeekFlags flags=Monday_First, const TimeZone &tz=Local) const
	Returns the number of the week of the year this date is in.

int	GetYear (const TimeZone &tz=Local) const
	Returns the year in the given timezone (local one by default).

bool	IsValid () const
	Returns true if the object represents a valid time moment.

bool	IsWorkDay (Country country=Country_Default) const
	Returns true is this day is not a holiday in the given country.

Date Comparison
There are several functions to allow date comparison. To supplement them, a few global operators, etc taking wxDateTime are defined.
bool	IsEarlierThan (const wxDateTime &datetime) const
	Returns true if this date precedes the given one.

bool	IsEqualTo (const wxDateTime &datetime) const
	Returns true if the two dates are strictly identical.

bool	IsEqualUpTo (const wxDateTime &dt, const wxTimeSpan &ts) const
	Returns true if the date is equal to another one up to the given time interval, i.e. if the absolute difference between the two dates is less than this interval.

bool	IsLaterThan (const wxDateTime &datetime) const
	Returns true if this date is later than the given one.

bool	IsSameDate (const wxDateTime &dt) const
	Returns true if the date is the same without comparing the time parts.

bool	IsSameTime (const wxDateTime &dt) const
	Returns true if the time is the same (although dates may differ).

bool	IsStrictlyBetween (const wxDateTime &t1, const wxDateTime &t2) const
	Returns true if this date lies strictly between the two given dates.

bool	IsBetween (const wxDateTime &t1, const wxDateTime &t2) const
	Returns true if IsStrictlyBetween() is true or if the date is equal to one of the limit values.

Date Arithmetics
These functions carry out arithmetics on the wxDateTime objects. As explained in the overview, either wxTimeSpan or wxDateSpan may be added to wxDateTime, hence all functions are overloaded to accept both arguments. Also, both Add() and Subtract() have both const and non-const version. The first one returns a new object which represents the sum/difference of the original one with the argument while the second form modifies the object to which it is applied. The operators "-=" and "+=" are defined to be equivalent to the second forms of these functions.
wxDateTime	Add (const wxDateSpan &diff) const
	Adds the given date span to this object.

wxDateTime &	Add (const wxDateSpan &diff)
	Adds the given date span to this object.

wxDateTime	Add (const wxTimeSpan &diff) const
	Adds the given time span to this object.

wxDateTime &	Add (const wxTimeSpan &diff)
	Adds the given time span to this object.

wxDateTime	Subtract (const wxTimeSpan &diff) const
	Subtracts the given time span from this object.

wxDateTime &	Subtract (const wxTimeSpan &diff)
	Subtracts the given time span from this object.

wxDateTime	Subtract (const wxDateSpan &diff) const
	Subtracts the given date span from this object.

wxDateTime &	Subtract (const wxDateSpan &diff)
	Subtracts the given date span from this object.

wxTimeSpan	Subtract (const wxDateTime &dt) const
	Subtracts another date from this one and returns the difference between them as a wxTimeSpan.

wxDateSpan	DiffAsDateSpan (const wxDateTime &dt) const
	Returns the difference between this object and dt as a wxDateSpan.

wxDateTime &	operator+= (const wxDateSpan &diff)
	Adds the given date span to this object.

wxDateTime	operator+ (const wxDateSpan &ds) const
	Adds the given date span to this object.

wxDateTime &	operator-= (const wxDateSpan &diff)
	Subtracts the given date span from this object.

wxDateTime	operator- (const wxDateSpan &ds) const
	Subtracts the given date span from this object.

wxDateTime &	operator+= (const wxTimeSpan &diff)
	Adds the given time span to this object.

wxDateTime	operator+ (const wxTimeSpan &ts) const
	Adds the given time span to this object.

wxDateTime &	operator-= (const wxTimeSpan &diff)
	Subtracts the given time span from this object.

wxDateTime	operator- (const wxTimeSpan &ts) const
	Subtracts the given time span from this object.

wxTimeSpan	operator- (const wxDateTime &dt2) const
	Subtracts another date from this one and returns the difference between them as a wxTimeSpan.

Date Formatting and Parsing
See Date Formatting and Parsing
wxString	Format (const wxString &format=wxDefaultDateTimeFormat, const TimeZone &tz=Local) const
	This function does the same as the standard ANSI C `strftime(3)` function (http://www.cplusplus.com/reference/clibrary/ctime/strftime.html).

wxString	FormatDate () const
	Identical to calling Format() with `"%x"` argument (which means "preferred date representation for the current locale").

wxString	FormatISOCombined (char sep= 'T') const
	Returns the combined date-time representation in the ISO 8601 format `"YYYY-MM-DDTHH:MM:SS"`.

wxString	FormatISODate () const
	This function returns the date representation in the ISO 8601 format `"YYYY-MM-DD"`.

wxString	FormatISOTime () const
	This function returns the time representation in the ISO 8601 format `"HH:MM:SS"`.

wxString	FormatTime () const
	Identical to calling Format() with `"%X"` argument (which means "preferred time representation for the current locale").

bool	ParseDate (const wxString &date, wxString::const_iterator *end)
	This function is like ParseDateTime(), but it only allows the date to be specified.

bool	ParseDateTime (const wxString &datetime, wxString::const_iterator *end)
	Parses the string datetime containing the date and time in free format.

bool	ParseFormat (const wxString &date, const wxString &format, const wxDateTime &dateDef, wxString::const_iterator *end)
	This function parses the string date according to the given format.

bool	ParseFormat (const wxString &date, const wxString &format, wxString::const_iterator *end)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

bool	ParseFormat (const wxString &date, wxString::const_iterator *end)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

bool	ParseISOCombined (const wxString &date, char sep= 'T')
	This function parses the string containing the date and time in ISO 8601 combined format `"YYYY-MM-DDTHH:MM:SS"`.

bool	ParseISODate (const wxString &date)
	This function parses the date in ISO 8601 format `"YYYY-MM-DD"`.

bool	ParseISOTime (const wxString &date)
	This function parses the time in ISO 8601 format `"HH:MM:SS"`.

bool	ParseRfc822Date (const wxString &date, wxString::const_iterator *end)
	Parses the string date looking for a date formatted according to the RFC 822 in it.

bool	ParseTime (const wxString &time, wxString::const_iterator *end)
	This functions is like ParseDateTime(), but only allows the time to be specified in the input string.

Calendar Calculations
The functions in this section perform the basic calendar calculations, mostly related to the week days. They allow to find the given week day in the week with given number (either in the month or in the year) and so on. None of the functions in this section modify the time part of the wxDateTime, they only work with the date part of it.
wxDateTime	GetLastMonthDay (Month month=Inv_Month, int year=Inv_Year) const
	Returns the copy of this object to which SetToLastMonthDay() was applied.

wxDateTime	GetLastWeekDay (WeekDay weekday, Month month=Inv_Month, int year=Inv_Year)
	Returns the copy of this object to which SetToLastWeekDay() was applied.

wxDateTime	GetNextWeekDay (WeekDay weekday) const
	Returns the copy of this object to which SetToNextWeekDay() was applied.

wxDateTime	GetPrevWeekDay (WeekDay weekday) const
	Returns the copy of this object to which SetToPrevWeekDay() was applied.

wxDateTime	GetWeekDay (WeekDay weekday, int n=1, Month month=Inv_Month, int year=Inv_Year) const
	Returns the copy of this object to which SetToWeekDay() was applied.

wxDateTime	GetWeekDayInSameWeek (WeekDay weekday, WeekFlags flags=Monday_First) const
	Returns the copy of this object to which SetToWeekDayInSameWeek() was applied.

wxDateTime	GetYearDay (wxDateTime_t yday) const
	Returns the copy of this object to which SetToYearDay() was applied.

wxDateTime &	SetToLastMonthDay (Month month=Inv_Month, int year=Inv_Year)
	Sets the date to the last day in the specified month (the current one by default).

bool	SetToLastWeekDay (WeekDay weekday, Month month=Inv_Month, int year=Inv_Year)
	The effect of calling this function is the same as of calling `SetToWeekDay`(-1, weekday, month, year).

wxDateTime &	SetToNextWeekDay (WeekDay weekday)
	Sets the date so that it will be the first weekday following the current date.

wxDateTime &	SetToPrevWeekDay (WeekDay weekday)
	Sets the date so that it will be the last weekday before the current date.

bool	SetToWeekDay (WeekDay weekday, int n=1, Month month=Inv_Month, int year=Inv_Year)
	Sets the date to the n-th weekday in the given month of the given year (the current month and year are used by default).

wxDateTime &	SetToWeekDayInSameWeek (WeekDay weekday, WeekFlags flags=Monday_First)
	Adjusts the date so that it will still lie in the same week as before, but its week day will be the given one.

wxDateTime &	SetToYearDay (wxDateTime_t yday)
	Sets the date to the day number yday in the same year (i.e. unlike the other functions, this one does not use the current year).

Astronomical/Historical Functions
Some degree of support for the date units used in astronomy and/or history is provided. You can construct a wxDateTime object from a JDN and you may also get its JDN, MJD or Rata Die number from it. Related functions in other groups: wxDateTime(double), Set(double)
double	GetJDN () const
	Synonym for GetJulianDayNumber().

double	GetJulianDayNumber () const
	Returns the JDN corresponding to this date.

double	GetMJD () const
	Synonym for GetModifiedJulianDayNumber().

double	GetModifiedJulianDayNumber () const
	Returns the "Modified Julian Day Number" (MJD) which is, by definition, is equal to JDN - 2400000.5.

double	GetRataDie () const
	Return the Rata Die number of this date.

Time Zone and DST Support
Please see the time zone overview for more information about time zones. Normally, these functions should be rarely used. Related functions in other groups: GetBeginDST(), GetEndDST()
wxDateTime	FromTimezone (const TimeZone &tz, bool noDST=false) const
	Transform the date from the given time zone to the local one.

int	IsDST (Country country=Country_Default) const
	Returns true if the DST is applied for this date in the given country.

wxDateTime &	MakeFromTimezone (const TimeZone &tz, bool noDST=false)
	Same as FromTimezone() but modifies the object in place.

wxDateTime &	MakeTimezone (const TimeZone &tz, bool noDST=false)
	Modifies the object in place to represent the date in another time zone.

wxDateTime &	MakeUTC (bool noDST=false)
	This is the same as calling MakeTimezone() with the argument `GMT0`.

wxDateTime	ToTimezone (const TimeZone &tz, bool noDST=false) const
	Transform the date to the given time zone.

wxDateTime	ToUTC (bool noDST=false) const
	This is the same as calling ToTimezone() with the argument `GMT0`.

Static Public Member Functions
static int	ConvertYearToBC (int year)
	Converts the year in absolute notation (i.e. a number which can be negative, positive or zero) to the year in BC/AD notation.

static void	GetAmPmStrings (wxString am, wxString pm)
	Returns the translations of the strings `AM` and `PM` used for time formatting for the current locale.

static wxDateTime	GetBeginDST (int year=Inv_Year, Country country=Country_Default)
	Get the beginning of DST for the given country in the given year (current one by default).

static wxDateTime	GetEndDST (int year=Inv_Year, Country country=Country_Default)
	Returns the end of DST for the given country in the given year (current one by default).

static int	GetCentury (int year)
	Get the current century, i.e. first two digits of the year, in given calendar (only Gregorian is currently supported).

static Country	GetCountry ()
	Returns the current default country.

static Month	GetCurrentMonth (Calendar cal=Gregorian)
	Get the current month in given calendar (only Gregorian is currently supported).

static int	GetCurrentYear (Calendar cal=Gregorian)
	Get the current year in given calendar (only Gregorian is currently supported).

static wxString	GetEnglishMonthName (Month month, NameFlags flags=Name_Full)
	Return the standard English name of the given month.

static wxString	GetEnglishWeekDayName (WeekDay weekday, NameFlags flags=Name_Full)
	Return the standard English name of the given week day.

static wxString	GetMonthName (Month month, NameFlags flags=Name_Full)
	Gets the full (default) or abbreviated name of the given month.

static wxDateTime_t	GetNumberOfDays (int year, Calendar cal=Gregorian)
	Returns the number of days in the given year.

static wxDateTime_t	GetNumberOfDays (Month month, int year=Inv_Year, Calendar cal=Gregorian)
	Returns the number of days in the given month of the given year.

static time_t	GetTimeNow ()
	Returns the current time.

static tm *	GetTmNow (struct tm *tm)
	Returns the current time broken down using the buffer whose address is passed to the function with tm to store the result.

static tm *	GetTmNow ()
	Returns the current time broken down.

static wxString	GetWeekDayName (WeekDay weekday, NameFlags flags=Name_Full)
	Gets the full (default) or abbreviated name of the given week day.

static bool	IsDSTApplicable (int year=Inv_Year, Country country=Country_Default)
	Returns true if DST was used in the given year (the current one by default) in the given country.

static bool	IsLeapYear (int year=Inv_Year, Calendar cal=Gregorian)
	Returns true if the year is a leap one in the specified calendar.

static bool	IsWestEuropeanCountry (Country country=Country_Default)
	This function returns true if the specified (or default) country is one of Western European ones.

static wxDateTime	Now ()
	Returns the object corresponding to the current time.

static void	SetCountry (Country country)
	Sets the country to use by default.

static wxDateTime	SetToWeekOfYear (int year, wxDateTime_t numWeek, WeekDay weekday=Mon)
	Set the date to the given weekday in the week number numWeek of the given year .

static wxDateTime	Today ()
	Returns the object corresponding to the midnight of the current day (i.e. the same as Now(), but the time part is set to 0).

static wxDateTime	UNow ()
	Returns the object corresponding to the current UTC time including the milliseconds.

Member Typedef Documentation

typedef unsigned short wxDateTime::wxDateTime_t

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.

Member Enumeration Documentation

enum wxDateTime::Calendar

Several functions accept an extra parameter specifying the calendar to use (although most of them only support now the Gregorian calendar).

This parameters is one of the following values.

Enumerator:

Gregorian	calendar currently in use in Western countries
Julian	calendar in use since -45 until the 1582 (or later)

enum wxDateTime::Country

Date calculations often depend on the country and wxDateTime allows to set the country whose conventions should be used using SetCountry().

It takes one of the following values as parameter.

Enumerator:

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
Country_WesternEurope_Start
Country_EEC
France
Germany
UK
Country_WesternEurope_End
Russia
USA

enum wxDateTime::Month

symbolic names for the months

Enumerator:

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Inv_Month	Invalid month value.

enum wxDateTime::NameFlags

Flags to be used with GetMonthName() and GetWeekDayName() functions.

Enumerator:

Name_Full	return full name
Name_Abbr	return abbreviated name

enum wxDateTime::TZ

Time zone symbolic names.

Enumerator:

Local	the time in the current time zone
GMT_12	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
GMT_11	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
GMT_10	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
GMT_9	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
GMT_8	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
GMT_7	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
GMT_6	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
GMT_5	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
GMT_4	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
GMT_3	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
GMT_2	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
GMT_1	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
GMT0	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
GMT1	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
GMT2	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
GMT3	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
GMT4	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
GMT5	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
GMT6	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
GMT7	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
GMT8	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
GMT9	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
GMT10	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
GMT11	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
GMT12	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
GMT13	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
WET	Western Europe Time.
WEST	Western Europe Summer Time.
CET	Central Europe Time.
CEST	Central Europe Summer Time.
EET	Eastern Europe Time.
EEST	Eastern Europe Summer Time.
MSK	Moscow Time.
MSD	Moscow Summer Time.
AST	Atlantic Standard Time.
ADT	Atlantic Daylight Time.
EST	Eastern Standard Time.
EDT	Eastern Daylight Saving Time.
CST	Central Standard Time.
CDT	Central Daylight Saving Time.
MST	Mountain Standard Time.
MDT	Mountain Daylight Saving Time.
PST	Pacific Standard Time.
PDT	Pacific Daylight Saving Time.
HST	Hawaiian Standard Time.
AKST	Alaska Standard Time.
AKDT	Alaska Daylight Saving Time.
A_WST	Western Standard Time.
A_CST	Central Standard Time (+9.5)
A_EST	Eastern Standard Time.
A_ESST	Eastern Summer Time.
NZST	Standard Time.
NZDT	Daylight Saving Time.
UTC	Universal Coordinated Time = the new and politically correct name for GMT.

enum wxDateTime::WeekDay

symbolic names for the weekdays

Enumerator:

Sun
Mon
Tue
Wed
Thu
Fri
Sat
Inv_WeekDay	Invalid week day value.

enum wxDateTime::WeekFlags

Different parts of the world use different conventions for the week start.

In some countries, the week starts on Sunday, while in others – on Monday. The ISO standard doesn't address this issue, so we support both conventions in the functions whose result depends on it (GetWeekOfYear() and GetWeekOfMonth()).

The desired behaviour may be specified by giving one of the following constants as argument to these functions.

Enumerator:

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

enum wxDateTime::Year

invalid value for the year

Enumerator:

Inv_Year

Constructor & Destructor Documentation

wxDateTime::wxDateTime ( )

Default constructor.

Use one of the Set() functions to initialize the object later.

wxDateTime::wxDateTime ( const wxDateTime & date )

Copy constructor.

wxDateTime::wxDateTime ( time_t timet )

Same as Set().

wxDateTime::wxDateTime ( const struct tm & tm )

Same as Set().

wxDateTime::wxDateTime ( double jdn )

Same as Set().

wxDateTime::wxDateTime	(	wxDateTime_t	hour,
		wxDateTime_t	minute = `0`,
		wxDateTime_t	second = `0`,
		wxDateTime_t	millisec = `0`
	)

Same as Set().

wxDateTime::wxDateTime	(	wxDateTime_t	day,
		Month	month,
		int	year = `Inv_Year`,
		wxDateTime_t	hour = `0`,
		wxDateTime_t	minute = `0`,
		wxDateTime_t	second = `0`,
		wxDateTime_t	millisec = `0`
	)

Same as Set().

wxDateTime::wxDateTime ( const struct _SYSTEMTIME & st )

Same as SetFromMSWSysTime.

Parameters

st	Input, Windows SYSTEMTIME reference

Since: 2.9.0

Remarks: MSW only
Availability: only available for the wxMSW port.

Member Function Documentation

wxDateTime wxDateTime::Add ( const wxDateSpan & diff ) const

Adds the given date span to this object.

wxDateTime& wxDateTime::Add ( const wxDateSpan & diff )

Adds the given date span to this object.

wxDateTime wxDateTime::Add ( const wxTimeSpan & diff ) const

Adds the given time span to this object.

wxDateTime& wxDateTime::Add ( const wxTimeSpan & diff )

Adds the given time span to this object.

static int wxDateTime::ConvertYearToBC ( int year )

static

Converts the year in absolute notation (i.e. a number which can be negative, positive or zero) to the year in BC/AD notation.

For the positive years, nothing is done, but the year 0 is year 1 BC and so for other years there is a difference of 1.

This function should be used like this:

wxDateTime dt(...);
int y = dt.GetYear();
printf("The year is %d%s", wxDateTime::ConvertYearToBC(y), y > 0 ? "AD" : "BC");

wxDateSpan wxDateTime::DiffAsDateSpan ( const wxDateTime & dt ) const

Returns the difference between this object and dt as a wxDateSpan.

This method allows to find the number of entire years, months, weeks and days between dt and this date.

Since: 2.9.5

wxString wxDateTime::Format	(	const wxString &	format = `wxDefaultDateTimeFormat`,
		const TimeZone &	tz = `Local`
	)		const

This function does the same as the standard ANSI C strftime(3) function (http://www.cplusplus.com/reference/clibrary/ctime/strftime.html).

Please see its description for the meaning of format parameter.

It also accepts a few wxWidgets-specific extensions: you can optionally specify the width of the field to follow using printf(3)-like syntax and the format specification "%l" can be used to get the number of milliseconds.

See Also: ParseFormat()

wxString wxDateTime::FormatDate ( ) const

Identical to calling Format() with "%x" argument (which means "preferred date representation for the current locale").

wxString wxDateTime::FormatISOCombined ( char sep = 'T' ) const

Returns the combined date-time representation in the ISO 8601 format "YYYY-MM-DDTHH:MM:SS".

The sep parameter default value produces the result exactly corresponding to the ISO standard, but it can also be useful to use a space as separator if a more human-readable combined date-time representation is needed.

See Also: FormatISODate(), FormatISOTime(), ParseISOCombined()

wxString wxDateTime::FormatISODate ( ) const

This function returns the date representation in the ISO 8601 format "YYYY-MM-DD".

wxString wxDateTime::FormatISOTime ( ) const

This function returns the time representation in the ISO 8601 format "HH:MM:SS".

wxString wxDateTime::FormatTime ( ) const

Identical to calling Format() with "%X" argument (which means "preferred time representation for the current locale").

wxDateTime wxDateTime::FromTimezone	(	const TimeZone &	tz,
		bool	noDST = `false`
	)		const

Transform the date from the given time zone to the local one.

If noDST is true, no DST adjustments will be made.

Returns: The date in the local time zone.

static void wxDateTime::GetAmPmStrings	(	wxString *	am,
		wxString *	pm
	)

static

Returns the translations of the strings AM and PM used for time formatting for the current locale.

Either of the pointers may be NULL if the corresponding value is not needed.

unsigned long wxDateTime::GetAsDOS ( ) const

Returns the date and time in DOS format.

void wxDateTime::GetAsMSWSysTime ( struct _SYSTEMTIME * st ) const

Returns the date and time in the Windows SYSTEMTIME format.

Parameters

st	Output, pointer to Windows SYSTEMTIME

Since: 2.9.0

Remarks: MSW only
Availability: only available for the wxMSW port.

static wxDateTime wxDateTime::GetBeginDST	(	int	year = `Inv_Year`,
		Country	country = `Country_Default`
	)

static

Get the beginning of DST for the given country in the given year (current one by default).

This function suffers from limitations described in the DST overview.

See Also: GetEndDST()

int wxDateTime::GetCentury ( const TimeZone & tz = Local ) const

Returns the century of this date.

static int wxDateTime::GetCentury ( int year )

static

Get the current century, i.e. first two digits of the year, in given calendar (only Gregorian is currently supported).

static Country wxDateTime::GetCountry ( )

static

Returns the current default country.

The default country is used for DST calculations, for example.

See Also: SetCountry()

static Month wxDateTime::GetCurrentMonth ( Calendar cal = Gregorian )

static

Get the current month in given calendar (only Gregorian is currently supported).

static int wxDateTime::GetCurrentYear ( Calendar cal = Gregorian )

static

Get the current year in given calendar (only Gregorian is currently supported).

wxDateTime wxDateTime::GetDateOnly ( ) const

Returns the object having the same date component as this one but time of 00:00:00.

Since: 2.8.2

See Also: ResetTime()

unsigned short wxDateTime::GetDay ( const TimeZone & tz = Local ) const

Returns the day in the given timezone (local one by default).

unsigned short wxDateTime::GetDayOfYear ( const TimeZone & tz = Local ) const

Returns the day of the year (in 1-366 range) in the given timezone (local one by default).

static wxDateTime wxDateTime::GetEndDST	(	int	year = `Inv_Year`,
		Country	country = `Country_Default`
	)

static

Returns the end of DST for the given country in the given year (current one by default).

See Also: GetBeginDST()

static wxString wxDateTime::GetEnglishMonthName	(	Month	month,
		NameFlags	flags = `Name_Full`
	)

static

Return the standard English name of the given month.

This function always returns "January" or "Jan" for January, use GetMonthName() to retrieve the name of the month in the users current locale.

Parameters

month	One of wxDateTime::Jan, ..., wxDateTime::Dec values.
flags	Either Name_Full (default) or Name_Abbr.

See Also: GetEnglishWeekDayName()

Since: 2.9.0

static wxString wxDateTime::GetEnglishWeekDayName	(	WeekDay	weekday,
		NameFlags	flags = `Name_Full`
	)

static

Return the standard English name of the given week day.

This function always returns "Monday" or "Mon" for Monday, use GetWeekDayName() to retrieve the name of the month in the users current locale.

Parameters

weekday	One of wxDateTime::Sun, ..., wxDateTime::Sat values.
flags	Either Name_Full (default) or Name_Abbr.

See Also: GetEnglishMonthName()

Since: 2.9.0

unsigned short wxDateTime::GetHour ( const TimeZone & tz = Local ) const

Returns the hour in the given timezone (local one by default).

double wxDateTime::GetJDN ( ) const

Synonym for GetJulianDayNumber().

double wxDateTime::GetJulianDayNumber ( ) const

Returns the JDN corresponding to this date.

Beware of rounding errors!

See Also: GetModifiedJulianDayNumber()

wxDateTime wxDateTime::GetLastMonthDay	(	Month	month = `Inv_Month`,
		int	year = `Inv_Year`
	)		const

Returns the copy of this object to which SetToLastMonthDay() was applied.

wxDateTime wxDateTime::GetLastWeekDay	(	WeekDay	weekday,
		Month	month = `Inv_Month`,
		int	year = `Inv_Year`
	)

Returns the copy of this object to which SetToLastWeekDay() was applied.

unsigned short wxDateTime::GetMillisecond ( const TimeZone & tz = Local ) const

Returns the milliseconds in the given timezone (local one by default).

unsigned short wxDateTime::GetMinute ( const TimeZone & tz = Local ) const

Returns the minute in the given timezone (local one by default).

double wxDateTime::GetMJD ( ) const

Synonym for GetModifiedJulianDayNumber().

double wxDateTime::GetModifiedJulianDayNumber ( ) const

Returns the "Modified Julian Day Number" (MJD) which is, by definition, is equal to JDN - 2400000.5.

The MJDs are simpler to work with as the integral MJDs correspond to midnights of the dates in the Gregorian calendar and not the noons like JDN. The MJD 0 represents Nov 17, 1858.

Month wxDateTime::GetMonth ( const TimeZone & tz = Local ) const

Returns the month in the given timezone (local one by default).

static wxString wxDateTime::GetMonthName	(	Month	month,
		NameFlags	flags = `Name_Full`
	)

static

Gets the full (default) or abbreviated name of the given month.

This function returns the name in the current locale, use GetEnglishMonthName() to get the untranslated name if necessary.

Parameters

month	One of wxDateTime::Jan, ..., wxDateTime::Dec values.
flags	Either Name_Full (default) or Name_Abbr.

See Also: GetWeekDayName()

wxDateTime wxDateTime::GetNextWeekDay ( WeekDay weekday ) const

Returns the copy of this object to which SetToNextWeekDay() was applied.

static wxDateTime_t wxDateTime::GetNumberOfDays	(	int	year,
		Calendar	cal = `Gregorian`
	)

static

Returns the number of days in the given year.

The only supported value for cal currently is Gregorian.

static wxDateTime_t wxDateTime::GetNumberOfDays	(	Month	month,
		int	year = `Inv_Year`,
		Calendar	cal = `Gregorian`
	)

static

Returns the number of days in the given month of the given year.

The only supported value for cal currently is Gregorian.

wxDateTime wxDateTime::GetPrevWeekDay ( WeekDay weekday ) const

Returns the copy of this object to which SetToPrevWeekDay() was applied.

double wxDateTime::GetRataDie ( ) const

Return the Rata Die number of this date.

By 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.

unsigned short wxDateTime::GetSecond ( const TimeZone & tz = Local ) const

Returns the seconds in the given timezone (local one by default).

time_t wxDateTime::GetTicks ( ) const

Returns the number of seconds since Jan 1, 1970 UTC.

An assert failure will occur if the date is not in the range covered by time_t type, use GetValue() if you work with dates outside of it.

static time_t wxDateTime::GetTimeNow ( )

static

Returns the current time.

Tm wxDateTime::GetTm ( const TimeZone & tz = Local ) const

Returns broken down representation of the date and time.

static tm* wxDateTime::GetTmNow ( struct tm * tm )

static

Returns the current time broken down using the buffer whose address is passed to the function with tm to store the result.

static tm* wxDateTime::GetTmNow ( )

static

Returns the current time broken down.

Note that this function returns a pointer to a static buffer that's reused by calls to this function and certain C library functions (e.g. localtime). If there is any chance your code might be used in a multi-threaded application, you really should use GetTmNow(struct tm *) instead.

WeekDay wxDateTime::GetWeekDay ( const TimeZone & tz = Local ) const

Returns the week day in the given timezone (local one by default).

wxDateTime wxDateTime::GetWeekDay	(	WeekDay	weekday,
		int	n = `1`,
		Month	month = `Inv_Month`,
		int	year = `Inv_Year`
	)		const

Returns the copy of this object to which SetToWeekDay() was applied.

wxDateTime wxDateTime::GetWeekDayInSameWeek	(	WeekDay	weekday,
		WeekFlags	flags = `Monday_First`
	)		const

Returns the copy of this object to which SetToWeekDayInSameWeek() was applied.

static wxString wxDateTime::GetWeekDayName	(	WeekDay	weekday,
		NameFlags	flags = `Name_Full`
	)

static

Gets the full (default) or abbreviated name of the given week day.

This function returns the name in the current locale, use GetEnglishWeekDayName() to get the untranslated name if necessary.

Parameters

weekday	One of wxDateTime::Sun, ..., wxDateTime::Sat values.
flags	Either Name_Full (default) or Name_Abbr.

See Also: GetMonthName()

wxDateTime_t wxDateTime::GetWeekOfMonth	(	WeekFlags	flags = `Monday_First`,
		const TimeZone &	tz = `Local`
	)		const

Returns the ordinal number of the week in the month (in 1-5 range).

As GetWeekOfYear(), this function supports both conventions for the week start.

wxDateTime_t wxDateTime::GetWeekOfYear	(	WeekFlags	flags = `Monday_First`,
		const TimeZone &	tz = `Local`
	)		const

Returns the number of the week of the year this date is in.

The first week of the year is, according to international standards, the one containing Jan 4 or, equivalently, the first week which has Thursday in this year. Both of these definitions are the same as saying that the first week of the year must contain more than half of its days in this year. Accordingly, the week number will always be in 1-53 range (52 for non-leap years).

The function depends on the week start convention specified by the flags argument but its results for Sunday_First are not well-defined as the ISO definition quoted above applies to the weeks starting on Monday only.

int wxDateTime::GetYear ( const TimeZone & tz = Local ) const

Returns the year in the given timezone (local one by default).

wxDateTime wxDateTime::GetYearDay ( wxDateTime_t yday ) const

Returns the copy of this object to which SetToYearDay() was applied.

bool wxDateTime::IsBetween	(	const wxDateTime &	t1,
		const wxDateTime &	t2
	)		const

Returns true if IsStrictlyBetween() is true or if the date is equal to one of the limit values.

See Also: IsStrictlyBetween()

int wxDateTime::IsDST ( Country country = Country_Default ) const

Returns true if the DST is applied for this date in the given country.

See Also: GetBeginDST(), GetEndDST()

static bool wxDateTime::IsDSTApplicable	(	int	year = `Inv_Year`,
		Country	country = `Country_Default`
	)

static

Returns true if DST was used in the given year (the current one by default) in the given country.

bool wxDateTime::IsEarlierThan ( const wxDateTime & datetime ) const

Returns true if this date precedes the given one.

bool wxDateTime::IsEqualTo ( const wxDateTime & datetime ) const

Returns true if the two dates are strictly identical.

bool wxDateTime::IsEqualUpTo	(	const wxDateTime &	dt,
		const wxTimeSpan &	ts
	)		const

Returns true if the date is equal to another one up to the given time interval, i.e. if the absolute difference between the two dates is less than this interval.

bool wxDateTime::IsLaterThan ( const wxDateTime & datetime ) const

Returns true if this date is later than the given one.

static bool wxDateTime::IsLeapYear	(	int	year = `Inv_Year`,
		Calendar	cal = `Gregorian`
	)

static

Returns true if the year is a leap one in the specified calendar.

This functions supports Gregorian and Julian calendars.

bool wxDateTime::IsSameDate ( const wxDateTime & dt ) const

Returns true if the date is the same without comparing the time parts.

bool wxDateTime::IsSameTime ( const wxDateTime & dt ) const

Returns true if the time is the same (although dates may differ).

bool wxDateTime::IsStrictlyBetween	(	const wxDateTime &	t1,
		const wxDateTime &	t2
	)		const

Returns true if this date lies strictly between the two given dates.

See Also: IsBetween()

bool wxDateTime::IsValid ( ) const

Returns true if the object represents a valid time moment.

static bool wxDateTime::IsWestEuropeanCountry ( Country country = Country_Default )

static

This function returns true if the specified (or default) country is one of Western European ones.

It is used internally by wxDateTime to determine the DST convention and date and time formatting rules.

bool wxDateTime::IsWorkDay ( Country country = Country_Default ) const

Returns true is this day is not a holiday in the given country.

wxDateTime& wxDateTime::MakeFromTimezone	(	const TimeZone &	tz,
		bool	noDST = `false`
	)

Same as FromTimezone() but modifies the object in place.

wxDateTime& wxDateTime::MakeTimezone	(	const TimeZone &	tz,
		bool	noDST = `false`
	)

Modifies the object in place to represent the date in another time zone.

If noDST is true, no DST adjustments will be made.

wxDateTime& wxDateTime::MakeUTC ( bool noDST = false )

This is the same as calling MakeTimezone() with the argument GMT0.

static wxDateTime wxDateTime::Now ( )

static

Returns the object corresponding to the current time.

Example:

wxDateTime now = wxDateTime::Now();

printf("Current time in Paris:\t%s\n", now.Format("%c", wxDateTime::CET).c_str());

Note: This function is accurate up to seconds. UNow() can be used if better precision is required.

See Also: Today()

wxDateTime wxDateTime::operator+ ( const wxDateSpan & ds ) const

Adds the given date span to this object.

wxDateTime wxDateTime::operator+ ( const wxTimeSpan & ts ) const

Adds the given time span to this object.

wxDateTime& wxDateTime::operator+= ( const wxDateSpan & diff )

Adds the given date span to this object.

wxDateTime& wxDateTime::operator+= ( const wxTimeSpan & diff )

Adds the given time span to this object.

wxDateTime wxDateTime::operator- ( const wxDateSpan & ds ) const

Subtracts the given date span from this object.

wxDateTime wxDateTime::operator- ( const wxTimeSpan & ts ) const

Subtracts the given time span from this object.

wxTimeSpan wxDateTime::operator- ( const wxDateTime & dt2 ) const

Subtracts another date from this one and returns the difference between them as a wxTimeSpan.

wxDateTime& wxDateTime::operator-= ( const wxDateSpan & diff )

Subtracts the given date span from this object.

wxDateTime& wxDateTime::operator-= ( const wxTimeSpan & diff )

Subtracts the given time span from this object.

wxDateTime& wxDateTime::operator= ( time_t timet )

Same as Set().

wxDateTime& wxDateTime::operator= ( const struct tm & tm )

Same as Set().

bool wxDateTime::ParseDate	(	const wxString &	date,
		wxString::const_iterator *	end
	)

This function is like ParseDateTime(), but it only allows the date to be specified.

It is thus less flexible then ParseDateTime(), but also has less chances to misinterpret the user input.

See ParseFormat() for the description of function parameters and return value.

See Also: Format()

bool wxDateTime::ParseDateTime	(	const wxString &	datetime,
		wxString::const_iterator *	end
	)

Parses the string datetime containing the date and time in free format.

This function tries as hard as it can to interpret the given string as date and time. Unlike ParseRfc822Date(), it will accept anything that may be accepted and will only reject strings which cannot be parsed in any way at all. Notice that the function will fail if either date or time part is present but not both, use ParseDate() or ParseTime() to parse strings containing just the date or time component.

See ParseFormat() for the description of function parameters and return value.

bool wxDateTime::ParseFormat	(	const wxString &	date,
		const wxString &	format,
		const wxDateTime &	dateDef,
		wxString::const_iterator *	end
	)

This function parses the string date according to the given format.

The system strptime(3) function is used whenever available, but even if it is not, this function is still implemented, although support for locale-dependent format specifiers such as "%c", "%x" or "%X" may not be perfect and GNU extensions such as "%z" and "%Z" are not implemented. This function does handle the month and weekday names in the current locale on all platforms, however.

Please see the description of the ANSI C function strftime(3) for the syntax of the format string.

The dateDef parameter is used to fill in the fields which could not be determined from the format string. For example, if the format is "%d" (the day of the month), the month and the year are taken from dateDef. If it is not specified, Today() is used as the default date.

Example of using this function:

wxDateTime dt;
wxString str = "...";
wxString::const_iterator end;
if ( !dt.ParseFormat(str, "%Y-%m-%d", &end) )
    ... parsing failed ...
else if ( end == str.end() )
    ... entire string parsed ...
else
    ... wxString(end, str.end()) left over ...

Parameters

date	The string to be parsed.
format	strptime()-like format string.
dateDef	Used to fill in the date components not specified in the date string.
end	Will be filled with the iterator pointing to the location where the parsing stopped if the function returns true. If the entire string was consumed, it is set to `date.end()`. Notice that this argument must be non-NULL.

Returns: true if at least part of the string was parsed successfully, false otherwise.

See Also: Format()

bool wxDateTime::ParseFormat	(	const wxString &	date,
		const wxString &	format,
		wxString::const_iterator *	end
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

bool wxDateTime::ParseFormat	(	const wxString &	date,
		wxString::const_iterator *	end
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

bool wxDateTime::ParseISOCombined	(	const wxString &	date,
		char	sep = `'T'`
	)

This function parses the string containing the date and time in ISO 8601 combined format "YYYY-MM-DDTHH:MM:SS".

The separator between the date and time parts must be equal to sep for the function to succeed.

Returns: true if the entire string was parsed successfully, false otherwise.

bool wxDateTime::ParseISODate ( const wxString & date )

This function parses the date in ISO 8601 format "YYYY-MM-DD".

Returns: true if the entire string was parsed successfully, false otherwise.

bool wxDateTime::ParseISOTime ( const wxString & date )

This function parses the time in ISO 8601 format "HH:MM:SS".

Returns: true if the entire string was parsed successfully, false otherwise.

bool wxDateTime::ParseRfc822Date	(	const wxString &	date,
		wxString::const_iterator *	end
	)

Parses the string date looking for a date formatted according to the RFC 822 in it.

The exact description of this format may, of course, be found in the RFC (section 5), but, briefly, this is the format used in the headers of Internet email messages and one of the most common strings expressing date in this format may be something like "Sat, 18 Dec 1999 00:48:30 +0100".

Returns NULL if the conversion failed, otherwise return the pointer to the character immediately following the part of the string which could be parsed. If the entire string contains only the date in RFC 822 format, the returned pointer will be pointing to a NUL character.

This function is intentionally strict, it will return an error for any string which is not RFC 822 compliant. If you need to parse date formatted in more free ways, you should use ParseDateTime() or ParseDate() instead.

See ParseFormat() for the description of function parameters and return value.

bool wxDateTime::ParseTime	(	const wxString &	time,
		wxString::const_iterator *	end
	)

This functions is like ParseDateTime(), but only allows the time to be specified in the input string.

See ParseFormat() for the description of function parameters and return value.

wxDateTime& wxDateTime::ResetTime ( )

Reset time to midnight (00:00:00) without changing the date.

wxDateTime& wxDateTime::Set ( time_t timet )

Constructs the object from timet value holding the number of seconds since Jan 1, 1970 UTC.

If timet is invalid, i.e.

(time_t)-1

, wxDateTime becomes invalid too, i.e. its IsValid() will return false.

wxDateTime& wxDateTime::Set ( const struct tm & tm )

Sets the date and time from the broken down representation in the standard tm structure.

wxDateTime& wxDateTime::Set ( const Tm & tm )

Sets the date and time from the broken down representation in the wxDateTime::Tm structure.

wxDateTime& wxDateTime::Set ( double jdn )

Sets the date from the so-called Julian Day Number.

By definition, the Julian Day Number, usually abbreviated as JDN, of a particular instant is the fractional number of days since 12 hours Universal Coordinated Time (Greenwich mean noon) on January 1 of the year -4712 in the Julian proleptic calendar.

wxDateTime& wxDateTime::Set	(	wxDateTime_t	hour,
		wxDateTime_t	minute = `0`,
		wxDateTime_t	second = `0`,
		wxDateTime_t	millisec = `0`
	)

Sets the date to be equal to Today() and the time from supplied parameters.

See the full Set() overload for the remarks about DST.

wxDateTime& wxDateTime::Set	(	wxDateTime_t	day,
		Month	month,
		int	year = `Inv_Year`,
		wxDateTime_t	hour = `0`,
		wxDateTime_t	minute = `0`,
		wxDateTime_t	second = `0`,
		wxDateTime_t	millisec = `0`
	)

Sets the date and time from the parameters.

If the function parameters are invalid, e.g. month is February and day is 30, the object is left in an invalid state, i.e. IsValid() method will return false.

If the specified time moment is invalid due to DST, i.e. it falls into the "missing" hour on the date on which the DST starts, a valid wxDateTime object is still constructed but its hour component is moved forward to ensure that it corresponds to a valid moment in the local time zone. For example, in the CET time zone the DST started on 2013-03-31T02:00:00 in 2013 and so setting the object to 2:30 at this date actually sets the hour to 3, and not 2.

static void wxDateTime::SetCountry ( Country country )

static

Sets the country to use by default.

This setting influences the DST calculations, date formatting and other things.

See Also: GetCountry()

wxDateTime& wxDateTime::SetDay ( unsigned short day )

Sets the day without changing other date components.

wxDateTime& wxDateTime::SetFromDOS ( unsigned long ddt )

Sets the date from the date and time in DOS format.

wxDateTime& wxDateTime::SetFromMSWSysTime ( const struct _SYSTEMTIME & st )

Initialize using the Windows SYSTEMTIME structure.

Parameters

st	Input, Windows SYSTEMTIME reference

Since: 2.9.0

Remarks: MSW only
Availability: only available for the wxMSW port.

wxDateTime& wxDateTime::SetHour ( unsigned short hour )

Sets the hour without changing other date components.

wxDateTime& wxDateTime::SetMillisecond ( unsigned short millisecond )

Sets the millisecond without changing other date components.

wxDateTime& wxDateTime::SetMinute ( unsigned short minute )

Sets the minute without changing other date components.

wxDateTime& wxDateTime::SetMonth ( Month month )

Sets the month without changing other date components.

wxDateTime& wxDateTime::SetSecond ( unsigned short second )

Sets the second without changing other date components.

wxDateTime& wxDateTime::SetToCurrent ( )

Sets the date and time of to the current values.

Same as assigning the result of Now() to this object.

wxDateTime& wxDateTime::SetToLastMonthDay	(	Month	month = `Inv_Month`,
		int	year = `Inv_Year`
	)

Sets the date to the last day in the specified month (the current one by default).

Returns: The reference to the modified object itself.

bool wxDateTime::SetToLastWeekDay	(	WeekDay	weekday,
		Month	month = `Inv_Month`,
		int	year = `Inv_Year`
	)

The effect of calling this function is the same as of calling SetToWeekDay(-1, weekday, month, year).

The date will be set to the last weekday in the given month and year (the current ones by default). Always returns true.

wxDateTime& wxDateTime::SetToNextWeekDay ( WeekDay weekday )

Sets the date so that it will be the first weekday following the current date.

Returns: The reference to the modified object itself.

wxDateTime& wxDateTime::SetToPrevWeekDay ( WeekDay weekday )

Sets the date so that it will be the last weekday before the current date.

Returns: The reference to the modified object itself.

bool wxDateTime::SetToWeekDay	(	WeekDay	weekday,
		int	n = `1`,
		Month	month = `Inv_Month`,
		int	year = `Inv_Year`
	)

Sets the date to the n-th weekday in the given month of the given year (the current month and year are used by default).

The parameter n may be either positive (counting from the beginning of the month) or negative (counting from the end of it).

For example, SetToWeekDay(2, wxDateTime::Wed) will set the date to the second Wednesday in the current month and SetToWeekDay(-1, wxDateTime::Sun) will set the date to the last Sunday in the current month.

Returns: true if the date was modified successfully, false otherwise meaning that the specified date doesn't exist.

wxDateTime& wxDateTime::SetToWeekDayInSameWeek	(	WeekDay	weekday,
		WeekFlags	flags = `Monday_First`
	)

Adjusts the date so that it will still lie in the same week as before, but its week day will be the given one.

Returns: The reference to the modified object itself.

static wxDateTime wxDateTime::SetToWeekOfYear	(	int	year,
		wxDateTime_t	numWeek,
		WeekDay	weekday = `Mon`
	)

static

Set the date to the given weekday in the week number numWeek of the given year .

The number should be in range 1-53.

Note that the returned date may be in a different year than the one passed to this function because both the week 1 and week 52 or 53 (for leap years) contain days from different years. See GetWeekOfYear() for the explanation of how the year weeks are counted.

wxDateTime& wxDateTime::SetToYearDay ( wxDateTime_t yday )

Sets the date to the day number yday in the same year (i.e. unlike the other functions, this one does not use the current year).

The day number should be in the range 1-366 for the leap years and 1-365 for the other ones.

Returns: The reference to the modified object itself.

wxDateTime& wxDateTime::SetYear ( int year )

Sets the year without changing other date components.

wxDateTime wxDateTime::Subtract ( const wxTimeSpan & diff ) const

Subtracts the given time span from this object.

wxDateTime& wxDateTime::Subtract ( const wxTimeSpan & diff )

Subtracts the given time span from this object.

wxDateTime wxDateTime::Subtract ( const wxDateSpan & diff ) const

Subtracts the given date span from this object.

wxDateTime& wxDateTime::Subtract ( const wxDateSpan & diff )

Subtracts the given date span from this object.

wxTimeSpan wxDateTime::Subtract ( const wxDateTime & dt ) const

Subtracts another date from this one and returns the difference between them as a wxTimeSpan.

static wxDateTime wxDateTime::Today ( )

static

Returns the object corresponding to the midnight of the current day (i.e. the same as Now(), but the time part is set to 0).

See Also: Now()

wxDateTime wxDateTime::ToTimezone	(	const TimeZone &	tz,
		bool	noDST = `false`
	)		const

Transform the date to the given time zone.

If noDST is true, no DST adjustments will be made.

Returns: The date in the new time zone.

wxDateTime wxDateTime::ToUTC ( bool noDST = false ) const

This is the same as calling ToTimezone() with the argument GMT0.

static wxDateTime wxDateTime::UNow ( )

static

Returns the object corresponding to the current UTC time including the milliseconds.

Notice that unlike Now(), this method creates a wxDateTime object corresponding to UTC, not local, time.

See Also: Now(), wxGetUTCTimeMillis()

Detailed Description

Static Functions

Date Formatting and Parsing

Classes

Public Types

Public Member Functions

Static Public Member Functions

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation