    wxDateTimewxDateTime class represents an absolute moment in the time. Types The type wxDateTime_t is typedefed as unsigned short and is used to contain the number of years, hours, minutes, seconds and milliseconds. Constants Global constant wxDefaultDateTime and synonym for it wxInvalidDateTime are defined. This constant will be different from any valid wxDateTime object. All the following constants are defined inside wxDateTime class (i.e., to refer to them you should prepend their names with wxDateTime::). Time zone symbolic names:
enum TZ
{
// the time in the current time zone
Local,
// zones from GMT (= Greenwhich Mean Time): they're guaranteed to be
// consequent numbers, so writing something like `GMT0 + offset' is
// safe if abs(offset) <= 12
// underscore stands for minus
GMT_12, GMT_11, GMT_10, GMT_9, GMT_8, GMT_7,
GMT_6, GMT_5, GMT_4, GMT_3, GMT_2, GMT_1,
GMT0,
GMT1, GMT2, GMT3, GMT4, GMT5, GMT6,
GMT7, GMT8, GMT9, GMT10, GMT11, GMT12, GMT13,
// Note that GMT12 and GMT_12 are not the same: there is a difference
// of exactly one day between them
// some symbolic names for TZ
// Europe
WET = GMT0, // Western Europe Time
WEST = GMT1, // Western Europe Summer Time
CET = GMT1, // Central Europe Time
CEST = GMT2, // Central Europe Summer Time
EET = GMT2, // Eastern Europe Time
EEST = GMT3, // Eastern Europe Summer Time
MSK = GMT3, // Moscow Time
MSD = GMT4, // Moscow Summer Time
// US and Canada
AST = GMT_4, // Atlantic Standard Time
ADT = GMT_3, // Atlantic Daylight Time
EST = GMT_5, // Eastern Standard Time
EDT = GMT_4, // Eastern Daylight Saving Time
CST = GMT_6, // Central Standard Time
CDT = GMT_5, // Central Daylight Saving Time
MST = GMT_7, // Mountain Standard Time
MDT = GMT_6, // Mountain Daylight Saving Time
PST = GMT_8, // Pacific Standard Time
PDT = GMT_7, // Pacific Daylight Saving Time
HST = GMT_10, // Hawaiian Standard Time
AKST = GMT_9, // Alaska Standard Time
AKDT = GMT_8, // Alaska Daylight Saving Time
// Australia
A_WST = GMT8, // Western Standard Time
A_CST = GMT13 + 1, // Central Standard Time (+9.5)
A_EST = GMT10, // Eastern Standard Time
A_ESST = GMT11, // Eastern Summer Time
// New Zealand
NZST = GMT12, // Standard Time
NZDT = GMT13, // Daylight Saving Time
// Universal Coordinated Time = the new and politically correct name
// for GMT
UTC = GMT0
};
Month names: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec and
Inv_Month for an invalid.month value are the values of wxDateTime::Month
enum.Likewise, Sun, Mon, Tue, Wed, Thu, Fri, Sat, and Inv_WeekDay are the values in wxDateTime::WeekDay enum. Finally, Inv_Year is defined to be an invalid value for year parameter. GetMonthName() and GetWeekDayName functions use the following flags:
enum NameFlags
{
Name_Full = 0x01, // return full name
Name_Abbr = 0x02 // return abbreviated name
};
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:
enum Calendar
{
Gregorian, // calendar currently in use in Western countries
Julian // calendar in use since -45 until the 1582 (or later)
};
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:
enum Country
{
Country_Unknown, // no special information for this country
Country_Default, // set the default country with SetCountry() method
// or use the default country with any other
Country_WesternEurope_Start,
Country_EEC = Country_WesternEurope_Start,
France,
Germany,
UK,
Country_WesternEurope_End = UK,
Russia,
USA
};
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 behvaiour may be specified by giving one of the following constants as argument to these functions:
enum WeekFlags
{
Default_First, // Sunday_First for US, Monday_First for the rest
Monday_First, // week starts with a Monday
Sunday_First // week starts with a Sunday
};
Derived fromNo base class Include files <wx/datetime.h> See also Date classes overview, wxTimeSpan, wxDateSpan, wxCalendarCtrl Function groups
Static functions
Static functionsFor convenience, all static functions are collected here. These 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. wxPython note: These methods are standalone functions named wxDateTime_<StaticMethodName> in wxPython.
SetCountry
Constructors, assignment operators and settersConstructors 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 can not return an error code.
wxDateTime()
AccessorsHere are the trivial accessors. Other functions, which might have to perform some more complicated calculations to find the answer are under the Calendar calculations section.
IsValid
Date comparisonThere are several function to allow date comparison. To supplement them, a few global operators >, < etc taking wxDateTime are defined.
IsEqualTo
Date arithmeticsThese 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.
Add(wxTimeSpan)
Parsing and formatting datesThese 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 and FormatISOTime) 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 can not 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 ans 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, ParseDateTime can parse the strings such as "tomorrow", "March first" and even "next Sunday".
ParseRfc822Date
Calendar calculationsThe 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. All (non-const) functions in this section don't modify the time part of the wxDateTime -- they only work with the date part of it.
SetToWeekDayInSameWeek
Astronomical/historical functionsSome 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.
wxDateTime(double jdn)
Time zone and DST supportPlease see the time zone overview for more information about time zones. Normally, these functions should be rarely used.
FromTimezone
wxDateTime::ConvertYearToBCstatic 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. 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");
wxDateTime::GetAmPmStringsstatic void GetAmPmStrings(wxString *am, wxString *pm) 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.
wxDateTime::GetBeginDSTstatic 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). This function suffers from limitations described in DST overview. See also
wxDateTime::GetCountrystatic Country GetCountry() Returns the current default country. The default country is used for DST calculations, for example. See also
wxDateTime::GetCurrentYearstatic int GetCurrentYear(Calendar cal = Gregorian) Get the current year in given calendar (only Gregorian is currently supported).
wxDateTime::GetCurrentMonthstatic Month GetCurrentMonth(Calendar cal = Gregorian) Get the current month in given calendar (only Gregorian is currently supported).
wxDateTime::GetCenturystatic int GetCentury(int year) Get the current century, i.e. first two digits of the year, in given calendar (only Gregorian is currently supported).
wxDateTime::GetEndDSTstatic 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). See also
wxDateTime::GetMonthNamestatic wxString GetMonthName(Month month, NameFlags flags = Name_Full) Gets the full (default) or abbreviated (specify Name_Abbr name of the given month. See also
wxDateTime::GetNumberOfDaysstatic wxDateTime_t GetNumberOfDays(int year, Calendar cal = Gregorian) static wxDateTime_t GetNumberOfDays(Month month, int year = Inv_Year, Calendar cal = Gregorian) Returns the number of days in the given year or in the given month of the year. The only supported value for cal parameter is currently Gregorian. wxPython note: These two methods are named GetNumberOfDaysInYear and GetNumberOfDaysInMonth in wxPython.
wxDateTime::GetTimeNowstatic time_t GetTimeNow() Returns the current time.
wxDateTime::GetTmNowstatic struct tm * GetTmNow(struct tm *tm) Returns the current time broken down, uses the buffer whose adress is passed to the function via tm to store the result.
wxDateTime::GetTmNowstatic struct tm * GetTmNow() 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 the flavour of function wxDateTime::GetTmNow taking a parameter.
wxDateTime::GetWeekDayNamestatic wxString GetWeekDayName(WeekDay weekday, NameFlags flags = Name_Full) Gets the full (default) or abbreviated (specify Name_Abbr name of the given week day. See also
wxDateTime::IsLeapYearstatic bool IsLeapYear(int year = Inv_Year, Calendar cal = Gregorian) Returns true if the year is a leap one in the specified calendar. This functions supports Gregorian and Julian calendars.
wxDateTime::IsWestEuropeanCountrystatic bool IsWestEuropeanCountry(Country country = Country_Default) 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.
wxDateTime::IsDSTApplicablestatic bool IsDSTApplicable(int year = Inv_Year, Country country = Country_Default) Returns true if DST was used n the given year (the current one by default) in the given country.
wxDateTime::Nowstatic wxDateTime Now() 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 that this function is accurate up to second:
wxDateTime::UNow should be used for better precision
(but it is less efficient and might not be available on all platforms).See also
wxDateTime::SetCountrystatic void SetCountry(Country country) Sets the country to use by default. This setting influences the DST calculations, date formatting and other things. The possible values for country parameter are enumerated in wxDateTime constants section. See also
wxDateTime::Todaystatic 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). See also
wxDateTime::UNowstatic wxDateTime UNow() Returns the object corresponding to the current time including the milliseconds if a function to get time with such precision is available on the current platform (supported under most Unices and Win32). See also
wxDateTime::wxDateTimewxDateTime() Default constructor. Use one of Set() functions to initialize the object later.
wxDateTime::wxDateTimewxDateTime& wxDateTime(time_t timet) Same as Set. wxPython note: This constructor is named wxDateTimeFromTimeT in wxPython.
wxDateTime::wxDateTimewxDateTime& wxDateTime(const struct tm& tm) Same as Set wxPython note: Unsupported.
wxDateTime::wxDateTimewxDateTime& wxDateTime(double jdn) Same as Set wxPython note: This constructor is named wxDateTimeFromJDN in wxPython.
wxDateTime::wxDateTimewxDateTime& wxDateTime(wxDateTime_t hour, wxDateTime_t minute = 0, wxDateTime_t second = 0, wxDateTime_t millisec = 0) Same as Set wxPython note: This constructor is named wxDateTimeFromHMS in wxPython.
wxDateTime::wxDateTimewxDateTime& wxDateTime(wxDateTime_t day, Month month = Inv_Month, int Inv_Year, wxDateTime_t hour = 0, wxDateTime_t minute = 0, wxDateTime_t second = 0, wxDateTime_t millisec = 0) Same as Set wxPython note: This constructor is named wxDateTimeFromDMY in wxPython.
wxDateTime::SetToCurrentwxDateTime& SetToCurrent() Sets the date and time of to the current values. Same as assigning the result of Now() to this object.
wxDateTime::SetwxDateTime& Set(time_t timet) Constructs the object from timet value holding the number of seconds since Jan 1, 1970. wxPython note: This method is named SetTimeT in wxPython.
wxDateTime::SetwxDateTime& Set(const struct tm& tm) Sets the date and time from the broken down representation in the standard tm structure. wxPython note: Unsupported.
wxDateTime::SetwxDateTime& 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. wxPython note: This method is named SetJDN in wxPython.
wxDateTime::SetwxDateTime& 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. wxPython note: This method is named SetHMS in wxPython.
wxDateTime::SetwxDateTime& Set(wxDateTime_t day, Month month = Inv_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::ResetTimewxDateTime& ResetTime() Reset time to midnight (00:00:00) without changing the date.
wxDateTime::SetYearwxDateTime& SetYear(int year) Sets the year without changing other date components.
wxDateTime::SetMonthwxDateTime& SetMonth(Month month) Sets the month without changing other date components.
wxDateTime::SetDaywxDateTime& SetDay(wxDateTime_t day) Sets the day without changing other date components.
wxDateTime::SetHourwxDateTime& SetHour(wxDateTime_t hour) Sets the hour without changing other date components.
wxDateTime::SetMinutewxDateTime& SetMinute(wxDateTime_t minute) Sets the minute without changing other date components.
wxDateTime::SetSecondwxDateTime& SetSecond(wxDateTime_t second) Sets the second without changing other date components.
wxDateTime::SetMillisecondwxDateTime& SetMillisecond(wxDateTime_t millisecond) Sets the millisecond without changing other date components.
wxDateTime::operator=wxDateTime& operator(time_t timet) Same as Set.
wxDateTime::operator=wxDateTime& operator(const struct tm& tm) Same as Set.
wxDateTime::IsValidbool IsValid() const Returns true if the object represents a valid time moment.
wxDateTime::GetDateOnlywxDateTime GetDateOnly() const Returns the object having the same date component as this one but time of 00:00:00. This function is new since wxWidgets version 2.8.2 See also
wxDateTime::GetTmTm GetTm(const TimeZone& tz = Local) const Returns broken down representation of the date and time.
wxDateTime::GetTickstime_t GetTicks() const Returns the number of seconds since Jan 1, 1970. An assert failure will occur if the date is not in the range covered by time_t type.
wxDateTime::GetCenturyint GetCentury(const TimeZone& tz = Local) const Returns the century of this date.
wxDateTime::GetYearint GetYear(const TimeZone& tz = Local) const Returns the year in the given timezone (local one by default).
wxDateTime::GetMonthMonth GetMonth(const TimeZone& tz = Local) const Returns the month in the given timezone (local one by default).
wxDateTime::GetDaywxDateTime_t GetDay(const TimeZone& tz = Local) const Returns the day in the given timezone (local one by default).
wxDateTime::GetWeekDayWeekDay GetWeekDay(const TimeZone& tz = Local) const Returns the week day in the given timezone (local one by default).
wxDateTime::GetHourwxDateTime_t GetHour(const TimeZone& tz = Local) const Returns the hour in the given timezone (local one by default).
wxDateTime::GetMinutewxDateTime_t GetMinute(const TimeZone& tz = Local) const Returns the minute in the given timezone (local one by default).
wxDateTime::GetSecondwxDateTime_t GetSecond(const TimeZone& tz = Local) const Returns the seconds in the given timezone (local one by default).
wxDateTime::GetMillisecondwxDateTime_t GetMillisecond(const TimeZone& tz = Local) const Returns the milliseconds in the given timezone (local one by default).
wxDateTime::GetDayOfYearwxDateTime_t GetDayOfYear(const TimeZone& tz = Local) const Returns the day of the year (in 1...366 range) in the given timezone (local one by default).
wxDateTime::GetWeekOfYearwxDateTime_t 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.
wxDateTime::GetWeekOfMonthwxDateTime_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). As GetWeekOfYear, this function supports both conventions for the week start. See the description of these week start conventions.
wxDateTime::IsWorkDaybool IsWorkDay(Country country = Country_Default) const Returns true is this day is not a holiday in the given country.
wxDateTime::IsGregorianDatebool IsGregorianDate(GregorianAdoption country = Gr_Standard) const Returns true if the given date is later than the date of adoption of the Gregorian calendar in the given country (and hence the Gregorian calendar calculations make sense for it).
wxDateTime::SetFromDOSwxDateTime& Set(unsigned long ddt) Sets the date from the date and time in DOS format.
wxDateTime::GetAsDOSunsigned long GetAsDOS() const Returns the date and time in DOS format.
wxDateTime::IsEqualTobool IsEqualTo(const wxDateTime& datetime) const Returns true if the two dates are strictly identical.
wxDateTime::IsEarlierThanbool IsEarlierThan(const wxDateTime& datetime) const Returns true if this date precedes the given one.
wxDateTime::IsLaterThanbool IsLaterThan(const wxDateTime& datetime) const Returns true if this date is later than the given one.
wxDateTime::IsStrictlyBetweenbool IsStrictlyBetween(const wxDateTime& t1, const wxDateTime& t2) const Returns true if this date lies strictly between the two others, See also
wxDateTime::IsBetweenbool 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
wxDateTime::IsSameDatebool IsSameDate(const wxDateTime& dt) const Returns true if the date is the same without comparing the time parts.
wxDateTime::IsSameTimebool IsSameTime(const wxDateTime& dt) const Returns true if the time is the same (although dates may differ).
wxDateTime::IsEqualUpTobool 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.
wxDateTime::AddwxDateTime Add(const wxTimeSpan& diff) const wxDateTime& Add(const wxTimeSpan& diff) wxDateTime& operator+=(const wxTimeSpan& diff) Adds the given time span to this object. wxPython note: This method is named AddTS in wxPython.
wxDateTime::AddwxDateTime Add(const wxDateSpan& diff) const wxDateTime& Add(const wxDateSpan& diff) wxDateTime& operator+=(const wxDateSpan& diff) Adds the given date span to this object. wxPython note: This method is named AddDS in wxPython.
wxDateTime::SubtractwxDateTime Subtract(const wxTimeSpan& diff) const wxDateTime& Subtract(const wxTimeSpan& diff) wxDateTime& operator-=(const wxTimeSpan& diff) Subtracts the given time span from this object. wxPython note: This method is named SubtractTS in wxPython.
wxDateTime::SubtractwxDateTime Subtract(const wxDateSpan& diff) const wxDateTime& Subtract(const wxDateSpan& diff) wxDateTime& operator-=(const wxDateSpan& diff) Subtracts the given date span from this object. wxPython note: This method is named SubtractDS in wxPython.
wxDateTime::SubtractwxTimeSpan Subtract(const wxDateTime& dt) const Subtracts another date from this one and returns the difference between them as wxTimeSpan.
wxDateTime::ParseRfc822Dateconst wxChar * ParseRfc822Date(const wxChar* date) 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.
wxDateTime::ParseFormatconst wxChar * ParseFormat(const wxChar *date, const wxChar *format = wxDefaultDateTimeFormat, const wxDateTime& dateDef = wxDefaultDateTime) 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 ay of the month), the month and the year are taken from dateDef. If it is not specified, Today is used as the default date. Returns NULL if the conversion failed, otherwise return the pointer to the character which stopped the scan.
wxDateTime::ParseDateTimeconst wxChar * ParseDateTime(const wxChar *datetime) 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 can not be parsed in any way at all. Returns NULL if the conversion failed, otherwise return the pointer to the character which stopped the scan.
wxDateTime::ParseDateconst wxChar * ParseDate(const wxChar *date) 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. Returns NULL if the conversion failed, otherwise return the pointer to the character which stopped the scan.
wxDateTime::ParseTimeconst wxChar * ParseTime(const wxChar *time) This functions is like ParseDateTime, but only allows the time to be specified in the input string. Returns NULL if the conversion failed, otherwise return the pointer to the character which stopped the scan.
wxDateTime::FormatwxString Format(const wxChar *format = wxDefaultDateTimeFormat, const TimeZone& tz = Local) const This function does the same as the standard ANSI C strftime(3) function. 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
wxDateTime::FormatDatewxString FormatDate() const Identical to calling Format() with "%x" argument (which means 'preferred date representation for the current locale').
wxDateTime::FormatTimewxString FormatTime() const Identical to calling Format() with "%X" argument (which means 'preferred time representation for the current locale').
wxDateTime::FormatISODatewxString FormatISODate() const This function returns the date representation in the ISO 8601 format (YYYY-MM-DD).
wxDateTime::FormatISOTimewxString FormatISOTime() const This function returns the time representation in the ISO 8601 format (HH:MM:SS).
wxDateTime::SetToWeekDayInSameWeekwxDateTime& SetToWeekDayInSameWeek(WeekDay weekday, WeekFlagsflags = 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.
wxDateTime::GetWeekDayInSameWeekwxDateTime GetWeekDayInSameWeek(WeekDay weekday, WeekFlagsflags = Monday_First) const Returns the copy of this object to which SetToWeekDayInSameWeek was applied.
wxDateTime::SetToNextWeekDaywxDateTime& 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::GetNextWeekDaywxDateTime GetNextWeekDay(WeekDay weekday) const Returns the copy of this object to which SetToNextWeekDay was applied.
wxDateTime::SetToPrevWeekDaywxDateTime& 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.
wxDateTime::GetPrevWeekDaywxDateTime GetPrevWeekDay(WeekDay weekday) const Returns the copy of this object to which SetToPrevWeekDay was applied.
wxDateTime::SetToWeekDaybool 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) -- to the last Sunday in it. Returns true if the date was modified successfully, false otherwise meaning that the specified date doesn't exist.
wxDateTime::GetWeekDaywxDateTime 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::SetToLastWeekDaybool 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::GetLastWeekDaywxDateTime GetLastWeekDay(WeekDay weekday, Month month = Inv_Month, int year = Inv_Year) Returns the copy of this object to which SetToLastWeekDay was applied.
wxDateTime::SetToWeekOfYearstatic 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 . 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::SetToLastMonthDaywxDateTime& 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.
wxDateTime::GetLastMonthDaywxDateTime GetLastMonthDay(Month month = Inv_Month, int year = Inv_Year) const Returns the copy of this object to which SetToLastMonthDay was applied.
wxDateTime::SetToYearDaywxDateTime& 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::GetYearDaywxDateTime GetYearDay(wxDateTime_t yday) const Returns the copy of this object to which SetToYearDay was applied.
wxDateTime::GetJulianDayNumberdouble GetJulianDayNumber() const Returns the JDN corresponding to this date. Beware of rounding errors! See also
wxDateTime::GetJDNdouble GetJDN() const Synonym for GetJulianDayNumber.
wxDateTime::GetModifiedJulianDayNumberdouble GetModifiedJulianDayNumber() const Returns the Modified Julian Day Number (MJD) which is, by definition, 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 th noons like JDN. The MJD 0 is Nov 17, 1858.
wxDateTime::GetMJDdouble GetMJD() const Synonym for GetModifiedJulianDayNumber.
wxDateTime::GetRataDiedouble 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.
wxDateTime::FromTimezonewxDateTime 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.
wxDateTime::ToTimezonewxDateTime 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::MakeTimezonewxDateTime& 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::MakeFromTimezonewxDateTime& MakeFromTimezone(const TimeZone& tz, bool noDST = false) Same as FromTimezone but modifies the object in place.
wxDateTime::ToUTCwxDateTime ToUTC(bool noDST = false) const This is the same as calling ToTimezone with the argument GMT0.
wxDateTime::MakeUTCwxDateTime& MakeUTC(bool noDST = false) This is the same as calling MakeTimezone with the argument GMT0.
wxDateTime::IsDSTint IsDST(Country country = Country_Default) const Returns true if the DST is applied for this date in the given country. See also GetBeginDST and GetEndDST
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