///////////////////////////////////////////////////////////////////////////// // Name: wx/datetime.h // Purpose: declarations of time/date related classes (wxDateTime, // wxTimeSpan) // Author: Vadim Zeitlin // Modified by: // Created: 10.02.99 // RCS-ID: $Id$ // Copyright: (c) 1998 Vadim Zeitlin // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// #ifndef _WX_DATETIME_H #define _WX_DATETIME_H #include "wx/defs.h" #if wxUSE_DATETIME #ifndef __WXWINCE__ #include #else #include "wx/msw/wince/time.h" #endif #include // for INT_MIN #include "wx/longlong.h" class WXDLLIMPEXP_BASE wxDateTime; class WXDLLIMPEXP_BASE wxTimeSpan; class WXDLLIMPEXP_BASE wxDateSpan; #include "wx/dynarray.h" // not all c-runtimes are based on 1/1/1970 being (time_t) 0 // set this to the corresponding value in seconds 1/1/1970 has on your // systems c-runtime #if defined(__WXMAC__) && !defined(__DARWIN__) && __MSL__ < 0x6000 #define WX_TIME_BASE_OFFSET ( 2082844800L + 126144000L ) #else #define WX_TIME_BASE_OFFSET 0 #endif /* * TODO * * + 1. Time zones with minutes (make TimeZone a class) * ? 2. getdate() function like under Solaris * + 3. text conversion for wxDateSpan * + 4. pluggable modules for the workdays calculations * 5. wxDateTimeHolidayAuthority for Easter and other christian feasts */ /* Two wrapper functions for thread safety */ #ifdef HAVE_LOCALTIME_R #define wxLocaltime_r localtime_r #else struct tm *wxLocaltime_r(const time_t*, struct tm*); #if wxUSE_THREADS && !defined(__WINDOWS__) && !defined(__WATCOMC__) // On Windows, localtime _is_ threadsafe! #warning using pseudo thread-safe wrapper for localtime to emulate localtime_r #endif #endif #ifdef HAVE_GMTIME_R #define wxGmtime_r gmtime_r #else struct tm *wxGmtime_r(const time_t*, struct tm*); #if wxUSE_THREADS && !defined(__WINDOWS__) && !defined(__WATCOMC__) // On Windows, gmtime _is_ threadsafe! #warning using pseudo thread-safe wrapper for gmtime to emulate gmtime_r #endif #endif /* The three (main) classes declared in this header represent: 1. An absolute moment in the time (wxDateTime) 2. A difference between two moments in the time, positive or negative (wxTimeSpan) 3. A logical difference between two dates expressed in years/months/weeks/days (wxDateSpan) The following arithmetic operations are permitted (all others are not): addition -------- wxDateTime + wxTimeSpan = wxDateTime wxDateTime + wxDateSpan = wxDateTime wxTimeSpan + wxTimeSpan = wxTimeSpan wxDateSpan + wxDateSpan = wxDateSpan subtraction ------------ wxDateTime - wxDateTime = wxTimeSpan wxDateTime - wxTimeSpan = wxDateTime wxDateTime - wxDateSpan = wxDateTime wxTimeSpan - wxTimeSpan = wxTimeSpan wxDateSpan - wxDateSpan = wxDateSpan multiplication -------------- wxTimeSpan * number = wxTimeSpan number * wxTimeSpan = wxTimeSpan wxDateSpan * number = wxDateSpan number * wxDateSpan = wxDateSpan unitary minus ------------- -wxTimeSpan = wxTimeSpan -wxDateSpan = wxDateSpan For each binary operation OP (+, -, *) we have the following operatorOP=() as a method and the method with a symbolic name OPER (Add, Subtract, Multiply) as a synonym for it and another const method with the same name which returns the changed copy of the object and operatorOP() as a global function which is implemented in terms of the const version of OPEN. For the unary - we have operator-() as a method, Neg() as synonym for it and Negate() which returns the copy of the object with the changed sign. */ // an invalid/default date time object which may be used as the default // argument for arguments of type wxDateTime; it is also returned by all // functions returning wxDateTime on failure (this is why it is also called // wxInvalidDateTime) class WXDLLIMPEXP_BASE wxDateTime; extern WXDLLIMPEXP_DATA_BASE(const wxChar*) wxDefaultDateTimeFormat; extern WXDLLIMPEXP_DATA_BASE(const wxChar*) wxDefaultTimeSpanFormat; extern WXDLLIMPEXP_DATA_BASE(const wxDateTime) wxDefaultDateTime; #define wxInvalidDateTime wxDefaultDateTime // ---------------------------------------------------------------------------- // wxDateTime represents an absolute moment in the time // ---------------------------------------------------------------------------- class WXDLLIMPEXP_BASE wxDateTime { public: // types // ------------------------------------------------------------------------ // a small unsigned integer type for storing things like minutes, // seconds &c. It should be at least short (i.e. not char) to contain // the number of milliseconds - it may also be 'int' because there is // no size penalty associated with it in our code, we don't store any // data in this format typedef unsigned short wxDateTime_t; // constants // ------------------------------------------------------------------------ // the timezones enum TZ { // the time in the current time zone Local, // zones from GMT (= Greenwhich Mean Time): they're guaranteed to be // consequent numbers, so writing something like `GMT0 + offset' is // safe if abs(offset) <= 12 // underscore stands for minus GMT_12, GMT_11, GMT_10, GMT_9, GMT_8, GMT_7, GMT_6, GMT_5, GMT_4, GMT_3, GMT_2, GMT_1, GMT0, GMT1, GMT2, GMT3, GMT4, GMT5, GMT6, GMT7, GMT8, GMT9, GMT10, GMT11, GMT12, // Note that GMT12 and GMT_12 are not the same: there is a difference // of exactly one day between them // some symbolic names for TZ // Europe WET = GMT0, // Western Europe Time WEST = GMT1, // Western Europe Summer Time CET = GMT1, // Central Europe Time CEST = GMT2, // Central Europe Summer Time EET = GMT2, // Eastern Europe Time EEST = GMT3, // Eastern Europe Summer Time MSK = GMT3, // Moscow Time MSD = GMT4, // Moscow Summer Time // US and Canada AST = GMT_4, // Atlantic Standard Time ADT = GMT_3, // Atlantic Daylight Time EST = GMT_5, // Eastern Standard Time EDT = GMT_4, // Eastern Daylight Saving Time CST = GMT_6, // Central Standard Time CDT = GMT_5, // Central Daylight Saving Time MST = GMT_7, // Mountain Standard Time MDT = GMT_6, // Mountain Daylight Saving Time PST = GMT_8, // Pacific Standard Time PDT = GMT_7, // Pacific Daylight Saving Time HST = GMT_10, // Hawaiian Standard Time AKST = GMT_9, // Alaska Standard Time AKDT = GMT_8, // Alaska Daylight Saving Time // Australia A_WST = GMT8, // Western Standard Time A_CST = GMT12 + 1, // Central Standard Time (+9.5) A_EST = GMT10, // Eastern Standard Time A_ESST = GMT11, // Eastern Summer Time // TODO add more symbolic timezone names here // Universal Coordinated Time = the new and politically correct name // for GMT UTC = GMT0 }; // the calendar systems we know about: notice that it's valid (for // this classes purpose anyhow) to work with any of these calendars // even with the dates before the historical appearance of the // calendar enum Calendar { Gregorian, // current calendar Julian // calendar in use since -45 until the 1582 (or later) // TODO Hebrew, Chinese, Maya, ... (just kidding) (or then may be not?) }; // these values only are used to identify the different dates of // adoption of the Gregorian calendar (see IsGregorian()) // // All data and comments taken verbatim from "The Calendar FAQ (v 2.0)" // by Claus Tøndering, http://www.pip.dknet.dk/~c-t/calendar.html // except for the comments "we take". // // Symbol "->" should be read as "was followed by" in the comments // which follow. enum GregorianAdoption { Gr_Unknown, // no data for this country or it's too uncertain to use Gr_Standard, // on the day 0 of Gregorian calendar: 15 Oct 1582 Gr_Alaska, // Oct 1867 when Alaska became part of the USA Gr_Albania, // Dec 1912 Gr_Austria = Gr_Unknown, // Different regions on different dates Gr_Austria_Brixen, // 5 Oct 1583 -> 16 Oct 1583 Gr_Austria_Salzburg = Gr_Austria_Brixen, Gr_Austria_Tyrol = Gr_Austria_Brixen, Gr_Austria_Carinthia, // 14 Dec 1583 -> 25 Dec 1583 Gr_Austria_Styria = Gr_Austria_Carinthia, Gr_Belgium, // Then part of the Netherlands Gr_Bulgaria = Gr_Unknown, // Unknown precisely (from 1915 to 1920) Gr_Bulgaria_1, // 18 Mar 1916 -> 1 Apr 1916 Gr_Bulgaria_2, // 31 Mar 1916 -> 14 Apr 1916 Gr_Bulgaria_3, // 3 Sep 1920 -> 17 Sep 1920 Gr_Canada = Gr_Unknown, // Different regions followed the changes in // Great Britain or France Gr_China = Gr_Unknown, // Different authorities say: Gr_China_1, // 18 Dec 1911 -> 1 Jan 1912 Gr_China_2, // 18 Dec 1928 -> 1 Jan 1929 Gr_Czechoslovakia, // (Bohemia and Moravia) 6 Jan 1584 -> 17 Jan 1584 Gr_Denmark, // (including Norway) 18 Feb 1700 -> 1 Mar 1700 Gr_Egypt, // 1875 Gr_Estonia, // 1918 Gr_Finland, // Then part of Sweden Gr_France, // 9 Dec 1582 -> 20 Dec 1582 Gr_France_Alsace, // 4 Feb 1682 -> 16 Feb 1682 Gr_France_Lorraine, // 16 Feb 1760 -> 28 Feb 1760 Gr_France_Strasbourg, // February 1682 Gr_Germany = Gr_Unknown, // Different states on different dates: Gr_Germany_Catholic, // 1583-1585 (we take 1584) Gr_Germany_Prussia, // 22 Aug 1610 -> 2 Sep 1610 Gr_Germany_Protestant, // 18 Feb 1700 -> 1 Mar 1700 Gr_GreatBritain, // 2 Sep 1752 -> 14 Sep 1752 (use 'cal(1)') Gr_Greece, // 9 Mar 1924 -> 23 Mar 1924 Gr_Hungary, // 21 Oct 1587 -> 1 Nov 1587 Gr_Ireland = Gr_GreatBritain, Gr_Italy = Gr_Standard, Gr_Japan = Gr_Unknown, // Different authorities say: Gr_Japan_1, // 19 Dec 1872 -> 1 Jan 1873 Gr_Japan_2, // 19 Dec 1892 -> 1 Jan 1893 Gr_Japan_3, // 18 Dec 1918 -> 1 Jan 1919 Gr_Latvia, // 1915-1918 (we take 1915) Gr_Lithuania, // 1915 Gr_Luxemburg, // 14 Dec 1582 -> 25 Dec 1582 Gr_Netherlands = Gr_Belgium, // (including Belgium) 1 Jan 1583 // this is too weird to take into account: the Gregorian calendar was // introduced twice in Groningen, first time 28 Feb 1583 was followed // by 11 Mar 1583, then it has gone back to Julian in the summer of // 1584 and then 13 Dec 1700 -> 12 Jan 1701 - which is // the date we take here Gr_Netherlands_Groningen, // 13 Dec 1700 -> 12 Jan 1701 Gr_Netherlands_Gelderland, // 30 Jun 1700 -> 12 Jul 1700 Gr_Netherlands_Utrecht, // (and Overijssel) 30 Nov 1700->12 Dec 1700 Gr_Netherlands_Friesland, // (and Drenthe) 31 Dec 1700 -> 12 Jan 1701 Gr_Norway = Gr_Denmark, // Then part of Denmark Gr_Poland = Gr_Standard, Gr_Portugal = Gr_Standard, Gr_Romania, // 31 Mar 1919 -> 14 Apr 1919 Gr_Russia, // 31 Jan 1918 -> 14 Feb 1918 Gr_Scotland = Gr_GreatBritain, Gr_Spain = Gr_Standard, // Sweden has a curious history. Sweden decided to make a gradual // change from the Julian to the Gregorian calendar. By dropping every // leap year from 1700 through 1740 the eleven superfluous days would // be omitted and from 1 Mar 1740 they would be in sync with the // Gregorian calendar. (But in the meantime they would be in sync with // nobody!) // // So 1700 (which should have been a leap year in the Julian calendar) // was not a leap year in Sweden. However, by mistake 1704 and 1708 // became leap years. This left Sweden out of synchronisation with // both the Julian and the Gregorian world, so they decided to go back // to the Julian calendar. In order to do this, they inserted an extra // day in 1712, making that year a double leap year! So in 1712, // February had 30 days in Sweden. // // Later, in 1753, Sweden changed to the Gregorian calendar by // dropping 11 days like everyone else. Gr_Sweden = Gr_Finland, // 17 Feb 1753 -> 1 Mar 1753 Gr_Switzerland = Gr_Unknown,// Different cantons used different dates Gr_Switzerland_Catholic, // 1583, 1584 or 1597 (we take 1584) Gr_Switzerland_Protestant, // 31 Dec 1700 -> 12 Jan 1701 Gr_Turkey, // 1 Jan 1927 Gr_USA = Gr_GreatBritain, Gr_Wales = Gr_GreatBritain, Gr_Yugoslavia // 1919 }; // the country parameter is used so far for calculating the start and // the end of DST period and for deciding whether the date is a work // day or not // // TODO move this to intl.h // Required for WinCE #ifdef USA #undef USA #endif enum Country { Country_Unknown, // no special information for this country Country_Default, // set the default country with SetCountry() method // or use the default country with any other // TODO add more countries (for this we must know about DST and/or // holidays for this country) // Western European countries: we assume that they all follow the same // DST rules (true or false?) Country_WesternEurope_Start, Country_EEC = Country_WesternEurope_Start, France, Germany, UK, Country_WesternEurope_End = UK, Russia, USA }; // symbolic names for the months enum Month { Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec, Inv_Month }; // symbolic names for the weekdays enum WeekDay { Sun, Mon, Tue, Wed, Thu, Fri, Sat, Inv_WeekDay }; // invalid value for the year enum Year { Inv_Year = SHRT_MIN // should hold in wxDateTime_t }; // flags for GetWeekDayName and GetMonthName enum NameFlags { Name_Full = 0x01, // return full name Name_Abbr = 0x02 // return abbreviated name }; // flags for GetWeekOfYear and GetWeekOfMonth enum WeekFlags { Default_First, // Sunday_First for US, Monday_First for the rest Monday_First, // week starts with a Monday Sunday_First // week starts with a Sunday }; // helper classes // ------------------------------------------------------------------------ // a class representing a time zone: basicly, this is just an offset // (in seconds) from GMT class WXDLLIMPEXP_BASE TimeZone { public: TimeZone(TZ tz); TimeZone(wxDateTime_t offset = 0) { m_offset = offset; } long GetOffset() const { return m_offset; } private: // offset for this timezone from GMT in seconds long m_offset; }; // standard struct tm is limited to the years from 1900 (because // tm_year field is the offset from 1900), so we use our own struct // instead to represent broken down time // // NB: this struct should always be kept normalized (i.e. mon should // be < 12, 1 <= day <= 31 &c), so use AddMonths(), AddDays() // instead of modifying the member fields directly! struct WXDLLIMPEXP_BASE Tm { wxDateTime_t msec, sec, min, hour, mday; Month mon; int year; // default ctor inits the object to an invalid value Tm(); // ctor from struct tm and the timezone Tm(const struct tm& tm, const TimeZone& tz); // check that the given date/time is valid (in Gregorian calendar) bool IsValid() const; // get the week day WeekDay GetWeekDay() // not const because wday may be changed { if ( wday == Inv_WeekDay ) ComputeWeekDay(); return (WeekDay)wday; } // add the given number of months to the date keeping it normalized void AddMonths(int monDiff); // add the given number of months to the date keeping it normalized void AddDays(int dayDiff); private: // compute the weekday from other fields void ComputeWeekDay(); // the timezone we correspond to TimeZone m_tz; // these values can't be accessed directly because they're not always // computed and we calculate them on demand wxDateTime_t wday, yday; }; // static methods // ------------------------------------------------------------------------ // set the current country static void SetCountry(Country country); // get the current country static Country GetCountry(); // return true if the country is a West European one (in practice, // this means that the same DST rules as for EEC apply) static bool IsWestEuropeanCountry(Country country = Country_Default); // return the current year static int GetCurrentYear(Calendar cal = Gregorian); // convert the year as returned by wxDateTime::GetYear() to a year // suitable for BC/AD notation. The difference is that BC year 1 // corresponds to the year 0 (while BC year 0 didn't exist) and AD // year N is just year N. static int ConvertYearToBC(int year); // return the current month static Month GetCurrentMonth(Calendar cal = Gregorian); // returns true if the given year is a leap year in the given calendar static bool IsLeapYear(int year = Inv_Year, Calendar cal = Gregorian); // get the century (19 for 1999, 20 for 2000 and -5 for 492 BC) static int GetCentury(int year = Inv_Year); // returns the number of days in this year (356 or 355 for Gregorian // calendar usually :-) static wxDateTime_t GetNumberOfDays(int year, Calendar cal = Gregorian); // get the number of the days in the given month (default value for // the year means the current one) static wxDateTime_t GetNumberOfDays(Month month, int year = Inv_Year, Calendar cal = Gregorian); // get the full (default) or abbreviated month name in the current // locale, returns empty string on error static wxString GetMonthName(Month month, NameFlags flags = Name_Full); // get the full (default) or abbreviated weekday name in the current // locale, returns empty string on error static wxString GetWeekDayName(WeekDay weekday, NameFlags flags = Name_Full); // get the AM and PM strings in the current locale (may be empty) static void GetAmPmStrings(wxString *am, wxString *pm); // return true if the given country uses DST for this year static bool IsDSTApplicable(int year = Inv_Year, Country country = Country_Default); // get the beginning of DST for this year, will return invalid object // if no DST applicable in this year. The default value of the // parameter means to take the current year. static wxDateTime GetBeginDST(int year = Inv_Year, Country country = Country_Default); // get the end of DST for this year, will return invalid object // if no DST applicable in this year. The default value of the // parameter means to take the current year. static wxDateTime GetEndDST(int year = Inv_Year, Country country = Country_Default); // return the wxDateTime object for the current time static inline wxDateTime Now(); // return the wxDateTime object for the current time with millisecond // precision (if available on this platform) static wxDateTime UNow(); // return the wxDateTime object for today midnight: i.e. as Now() but // with time set to 0 static inline wxDateTime Today(); // constructors: you should test whether the constructor succeeded with // IsValid() function. The values Inv_Month and Inv_Year for the // parameters mean take current month and/or year values. // ------------------------------------------------------------------------ // default ctor does not initialize the object, use Set()! wxDateTime() { m_time = wxLongLong((long)ULONG_MAX, ULONG_MAX); } // from time_t: seconds since the Epoch 00:00:00 UTC, Jan 1, 1970) #if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400)) // VA C++ confuses this with wxDateTime(double jdn) thinking it is a duplicate declaration inline wxDateTime(time_t timet); #endif // from broken down time/date (only for standard Unix range) inline wxDateTime(const struct tm& tm); // from broken down time/date (any range) inline wxDateTime(const Tm& tm); // from JDN (beware of rounding errors) inline wxDateTime(double jdn); // from separate values for each component, date set to today inline wxDateTime(wxDateTime_t hour, wxDateTime_t minute = 0, wxDateTime_t second = 0, wxDateTime_t millisec = 0); // from separate values for each component with explicit date inline wxDateTime(wxDateTime_t day, // day of the month Month month, int year = Inv_Year, // 1999, not 99 please! wxDateTime_t hour = 0, wxDateTime_t minute = 0, wxDateTime_t second = 0, wxDateTime_t millisec = 0); // default copy ctor ok // no dtor // assignment operators and Set() functions: all non const methods return // the reference to this object. IsValid() should be used to test whether // the function succeeded. // ------------------------------------------------------------------------ // set to the current time inline wxDateTime& SetToCurrent(); #if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400)) // VA C++ confuses this with wxDateTime(double jdn) thinking it is a duplicate declaration // set to given time_t value inline wxDateTime& Set(time_t timet); #endif // set to given broken down time/date wxDateTime& Set(const struct tm& tm); // set to given broken down time/date inline wxDateTime& Set(const Tm& tm); // set to given JDN (beware of rounding errors) wxDateTime& Set(double jdn); // set to given time, date = today wxDateTime& Set(wxDateTime_t hour, wxDateTime_t minute = 0, wxDateTime_t second = 0, wxDateTime_t millisec = 0); // from separate values for each component with explicit date // (defaults for month and year are the current values) wxDateTime& Set(wxDateTime_t day, Month month, int year = Inv_Year, // 1999, not 99 please! wxDateTime_t hour = 0, wxDateTime_t minute = 0, wxDateTime_t second = 0, wxDateTime_t millisec = 0); // resets time to 00:00:00, doesn't change the date wxDateTime& ResetTime(); // the following functions don't change the values of the other // fields, i.e. SetMinute() won't change either hour or seconds value // set the year wxDateTime& SetYear(int year); // set the month wxDateTime& SetMonth(Month month); // set the day of the month wxDateTime& SetDay(wxDateTime_t day); // set hour wxDateTime& SetHour(wxDateTime_t hour); // set minute wxDateTime& SetMinute(wxDateTime_t minute); // set second wxDateTime& SetSecond(wxDateTime_t second); // set millisecond wxDateTime& SetMillisecond(wxDateTime_t millisecond); // assignment operator from time_t wxDateTime& operator=(time_t timet) { return Set(timet); } // assignment operator from broken down time/date wxDateTime& operator=(const struct tm& tm) { return Set(tm); } // assignment operator from broken down time/date wxDateTime& operator=(const Tm& tm) { return Set(tm); } // default assignment operator is ok // calendar calculations (functions which set the date only leave the time // unchanged, e.g. don't explictly zero it): SetXXX() functions modify the // object itself, GetXXX() ones return a new object. // ------------------------------------------------------------------------ // set to the given week day in the same week as this one wxDateTime& SetToWeekDayInSameWeek(WeekDay weekday, WeekFlags flags = Monday_First); inline wxDateTime GetWeekDayInSameWeek(WeekDay weekday, WeekFlags flags = Monday_First) const; // set to the next week day following this one wxDateTime& SetToNextWeekDay(WeekDay weekday); inline wxDateTime GetNextWeekDay(WeekDay weekday) const; // set to the previous week day before this one wxDateTime& SetToPrevWeekDay(WeekDay weekday); inline wxDateTime GetPrevWeekDay(WeekDay weekday) const; // set to Nth occurence of given weekday in the given month of the // given year (time is set to 0), return true on success and false on // failure. n may be positive (1..5) or negative to count from the end // of the month (see helper function SetToLastWeekDay()) bool SetToWeekDay(WeekDay weekday, int n = 1, Month month = Inv_Month, int year = Inv_Year); inline wxDateTime GetWeekDay(WeekDay weekday, int n = 1, Month month = Inv_Month, int year = Inv_Year) const; // sets to the last weekday in the given month, year inline bool SetToLastWeekDay(WeekDay weekday, Month month = Inv_Month, int year = Inv_Year); inline wxDateTime GetLastWeekDay(WeekDay weekday, Month month = Inv_Month, int year = Inv_Year); // sets the date to the given day of the given week in the year, // returns true on success and false if given date doesn't exist (e.g. // numWeek is > 53) // // these functions are badly defined as they're not the reverse of // GetWeekOfYear(), use SetToTheWeekOfYear() instead wxDEPRECATED( bool SetToTheWeek(wxDateTime_t numWeek, WeekDay weekday = Mon, WeekFlags flags = Monday_First) ); wxDEPRECATED( wxDateTime GetWeek(wxDateTime_t numWeek, WeekDay weekday = Mon, WeekFlags flags = Monday_First) const ); // returns the date corresponding to the given week day of the given // week (in ISO notation) of the specified year static wxDateTime SetToWeekOfYear(int year, wxDateTime_t numWeek, WeekDay weekday = Mon); // sets the date to the last day of the given (or current) month or the // given (or current) year wxDateTime& SetToLastMonthDay(Month month = Inv_Month, int year = Inv_Year); inline wxDateTime GetLastMonthDay(Month month = Inv_Month, int year = Inv_Year) const; // sets to the given year day (1..365 or 366) wxDateTime& SetToYearDay(wxDateTime_t yday); inline wxDateTime GetYearDay(wxDateTime_t yday) const; // The definitions below were taken verbatim from // // http://www.capecod.net/~pbaum/date/date0.htm // // (Peter Baum's home page) // // definition: The Julian Day Number, Julian Day, or JD of a // particular instant of time is the number of days and fractions of a // day since 12 hours Universal Time (Greenwich mean noon) on January // 1 of the year -4712, where the year is given in the Julian // proleptic calendar. The idea of using this reference date was // originally proposed by Joseph Scalizer in 1582 to count years but // it was modified by 19th century astronomers to count days. One // could have equivalently defined the reference time to be noon of // November 24, -4713 if were understood that Gregorian calendar rules // were applied. Julian days are Julian Day Numbers and are not to be // confused with Julian dates. // // definition: The Rata Die number is a date specified as the number // of days relative to a base date of December 31 of the year 0. Thus // January 1 of the year 1 is Rata Die day 1. // get the Julian Day number (the fractional part specifies the time of // the day, related to noon - beware of rounding errors!) double GetJulianDayNumber() const; double GetJDN() const { return GetJulianDayNumber(); } // get the Modified Julian Day number: it is equal to JDN - 2400000.5 // and so integral MJDs correspond to the midnights (and not noons). // MJD 0 is Nov 17, 1858 double GetModifiedJulianDayNumber() const { return GetJDN() - 2400000.5; } double GetMJD() const { return GetModifiedJulianDayNumber(); } // get the Rata Die number double GetRataDie() const; // TODO algorithms for calculating some important dates, such as // religious holidays (Easter...) or moon/solar eclipses? Some // algorithms can be found in the calendar FAQ // Timezone stuff: a wxDateTime object constructed using given // day/month/year/hour/min/sec values is interpreted as this moment in // local time. Using the functions below, it may be converted to another // time zone (e.g., the Unix epoch is wxDateTime(1, Jan, 1970).ToGMT()). // // These functions try to handle DST internally, but there is no magical // way to know all rules for it in all countries in the world, so if the // program can handle it itself (or doesn't want to handle it at all for // whatever reason), the DST handling can be disabled with noDST. // ------------------------------------------------------------------------ // transform to any given timezone inline wxDateTime ToTimezone(const TimeZone& tz, bool noDST = false) const; wxDateTime& MakeTimezone(const TimeZone& tz, bool noDST = false); // interpret current value as being in another timezone and transform // it to local one inline wxDateTime FromTimezone(const TimeZone& tz, bool noDST = false) const; wxDateTime& MakeFromTimezone(const TimeZone& tz, bool noDST = false); // transform to/from GMT/UTC wxDateTime ToUTC(bool noDST = false) const { return ToTimezone(UTC, noDST); } wxDateTime& MakeUTC(bool noDST = false) { return MakeTimezone(UTC, noDST); } wxDateTime ToGMT(bool noDST = false) const { return ToUTC(noDST); } wxDateTime& MakeGMT(bool noDST = false) { return MakeUTC(noDST); } wxDateTime FromUTC(bool noDST = false) const { return FromTimezone(UTC, noDST); } wxDateTime& MakeFromUTC(bool noDST = false) { return MakeFromTimezone(UTC, noDST); } // is daylight savings time in effect at this moment according to the // rules of the specified country? // // Return value is > 0 if DST is in effect, 0 if it is not and -1 if // the information is not available (this is compatible with ANSI C) int IsDST(Country country = Country_Default) const; // accessors: many of them take the timezone parameter which indicates the // timezone for which to make the calculations and the default value means // to do it for the current timezone of this machine (even if the function // only operates with the date it's necessary because a date may wrap as // result of timezone shift) // ------------------------------------------------------------------------ // is the date valid? inline bool IsValid() const { return m_time != wxInvalidDateTime.m_time; } // get the broken down date/time representation in the given timezone // // If you wish to get several time components (day, month and year), // consider getting the whole Tm strcuture first and retrieving the // value from it - this is much more efficient Tm GetTm(const TimeZone& tz = Local) const; // get the number of seconds since the Unix epoch - returns (time_t)-1 // if the value is out of range inline time_t GetTicks() const; // get the year (returns Inv_Year if date is invalid) int GetYear(const TimeZone& tz = Local) const { return GetTm(tz).year; } // get the month (Inv_Month if date is invalid) Month GetMonth(const TimeZone& tz = Local) const { return (Month)GetTm(tz).mon; } // get the month day (in 1..31 range, 0 if date is invalid) wxDateTime_t GetDay(const TimeZone& tz = Local) const { return GetTm(tz).mday; } // get the day of the week (Inv_WeekDay if date is invalid) WeekDay GetWeekDay(const TimeZone& tz = Local) const { return GetTm(tz).GetWeekDay(); } // get the hour of the day wxDateTime_t GetHour(const TimeZone& tz = Local) const { return GetTm(tz).hour; } // get the minute wxDateTime_t GetMinute(const TimeZone& tz = Local) const { return GetTm(tz).min; } // get the second wxDateTime_t GetSecond(const TimeZone& tz = Local) const { return GetTm(tz).sec; } // get milliseconds wxDateTime_t GetMillisecond(const TimeZone& tz = Local) const { return GetTm(tz).msec; } // get the day since the year start (1..366, 0 if date is invalid) wxDateTime_t GetDayOfYear(const TimeZone& tz = Local) const; // get the week number since the year start (1..52 or 53, 0 if date is // invalid) wxDateTime_t GetWeekOfYear(WeekFlags flags = Monday_First, const TimeZone& tz = Local) const; // get the week number since the month start (1..5, 0 if date is // invalid) wxDateTime_t GetWeekOfMonth(WeekFlags flags = Monday_First, const TimeZone& tz = Local) const; // is this date a work day? This depends on a country, of course, // because the holidays are different in different countries bool IsWorkDay(Country country = Country_Default) const; // is this date later than Gregorian calendar introduction for the // given country (see enum GregorianAdoption)? // // NB: this function shouldn't be considered as absolute authority in // the matter. Besides, for some countries the exact date of // adoption of the Gregorian calendar is simply unknown. bool IsGregorianDate(GregorianAdoption country = Gr_Standard) const; // dos date and time format // ------------------------------------------------------------------------ // set from the DOS packed format wxDateTime& SetFromDOS(unsigned long ddt); // pack the date in DOS format unsigned long GetAsDOS() const; // comparison (see also functions below for operator versions) // ------------------------------------------------------------------------ // returns true if the two moments are strictly identical inline bool IsEqualTo(const wxDateTime& datetime) const; // returns true if the date is strictly earlier than the given one inline bool IsEarlierThan(const wxDateTime& datetime) const; // returns true if the date is strictly later than the given one inline bool IsLaterThan(const wxDateTime& datetime) const; // returns true if the date is strictly in the given range inline bool IsStrictlyBetween(const wxDateTime& t1, const wxDateTime& t2) const; // returns true if the date is in the given range inline bool IsBetween(const wxDateTime& t1, const wxDateTime& t2) const; // do these two objects refer to the same date? inline bool IsSameDate(const wxDateTime& dt) const; // do these two objects have the same time? inline bool IsSameTime(const wxDateTime& dt) const; // are these two objects equal up to given timespan? inline bool IsEqualUpTo(const wxDateTime& dt, const wxTimeSpan& ts) const; inline bool operator<(const wxDateTime& dt) const { wxASSERT_MSG( IsValid() && dt.IsValid(), _T("invalid wxDateTime") ); return GetValue() < dt.GetValue(); } inline bool operator<=(const wxDateTime& dt) const { wxASSERT_MSG( IsValid() && dt.IsValid(), _T("invalid wxDateTime") ); return GetValue() <= dt.GetValue(); } inline bool operator>(const wxDateTime& dt) const { wxASSERT_MSG( IsValid() && dt.IsValid(), _T("invalid wxDateTime") ); return GetValue() > dt.GetValue(); } inline bool operator>=(const wxDateTime& dt) const { wxASSERT_MSG( IsValid() && dt.IsValid(), _T("invalid wxDateTime") ); return GetValue() >= dt.GetValue(); } inline bool operator==(const wxDateTime& dt) const { wxASSERT_MSG( IsValid() && dt.IsValid(), _T("invalid wxDateTime") ); return GetValue() == dt.GetValue(); } inline bool operator!=(const wxDateTime& dt) const { wxASSERT_MSG( IsValid() && dt.IsValid(), _T("invalid wxDateTime") ); return GetValue() != dt.GetValue(); } // arithmetics with dates (see also below for more operators) // ------------------------------------------------------------------------ // return the sum of the date with a time span (positive or negative) inline wxDateTime Add(const wxTimeSpan& diff) const; // add a time span (positive or negative) inline wxDateTime& Add(const wxTimeSpan& diff); // add a time span (positive or negative) inline wxDateTime& operator+=(const wxTimeSpan& diff); inline wxDateTime operator+(const wxTimeSpan& ts) const { wxDateTime dt(*this); dt.Add(ts); return dt; } // return the difference of the date with a time span inline wxDateTime Subtract(const wxTimeSpan& diff) const; // subtract a time span (positive or negative) inline wxDateTime& Subtract(const wxTimeSpan& diff); // subtract a time span (positive or negative) inline wxDateTime& operator-=(const wxTimeSpan& diff); inline wxDateTime operator-(const wxTimeSpan& ts) const { wxDateTime dt(*this); dt.Subtract(ts); return dt; } // return the sum of the date with a date span inline wxDateTime Add(const wxDateSpan& diff) const; // add a date span (positive or negative) wxDateTime& Add(const wxDateSpan& diff); // add a date span (positive or negative) inline wxDateTime& operator+=(const wxDateSpan& diff); inline wxDateTime operator+(const wxDateSpan& ds) const { wxDateTime dt(*this); dt.Add(ds); return dt; } // return the difference of the date with a date span inline wxDateTime Subtract(const wxDateSpan& diff) const; // subtract a date span (positive or negative) inline wxDateTime& Subtract(const wxDateSpan& diff); // subtract a date span (positive or negative) inline wxDateTime& operator-=(const wxDateSpan& diff); inline wxDateTime operator-(const wxDateSpan& ds) const { wxDateTime dt(*this); dt.Subtract(ds); return dt; } // return the difference between two dates inline wxTimeSpan Subtract(const wxDateTime& dt) const; inline wxTimeSpan operator-(const wxDateTime& dt2) const; // conversion to/from text: all conversions from text return the pointer to // the next character following the date specification (i.e. the one where // the scan had to stop) or NULL on failure. // ------------------------------------------------------------------------ // parse a string in RFC 822 format (found e.g. in mail headers and // having the form "Wed, 10 Feb 1999 19:07:07 +0100") const wxChar *ParseRfc822Date(const wxChar* date); // parse a date/time in the given format (see strptime(3)), fill in // the missing (in the string) fields with the values of dateDef (by // default, they will not change if they had valid values or will // default to Today() otherwise) const wxChar *ParseFormat(const wxChar *date, const wxChar *format = wxDefaultDateTimeFormat, const wxDateTime& dateDef = wxDefaultDateTime); // parse a string containing the date/time in "free" format, this // function will try to make an educated guess at the string contents const wxChar *ParseDateTime(const wxChar *datetime); // parse a string containing the date only in "free" format (less // flexible than ParseDateTime) const wxChar *ParseDate(const wxChar *date); // parse a string containing the time only in "free" format const wxChar *ParseTime(const wxChar *time); // this function accepts strftime()-like format string (default // argument corresponds to the preferred date and time representation // for the current locale) and returns the string containing the // resulting text representation wxString Format(const wxChar *format = wxDefaultDateTimeFormat, const TimeZone& tz = Local) const; // preferred date representation for the current locale wxString FormatDate() const { return Format(_T("%x")); } // preferred time representation for the current locale wxString FormatTime() const { return Format(_T("%X")); } // returns the string representing the date in ISO 8601 format // (YYYY-MM-DD) wxString FormatISODate() const { return Format(_T("%Y-%m-%d")); } // returns the string representing the time in ISO 8601 format // (HH:MM:SS) wxString FormatISOTime() const { return Format(_T("%H:%M:%S")); } // implementation // ------------------------------------------------------------------------ // construct from internal representation wxDateTime(const wxLongLong& time) { m_time = time; } // get the internal representation inline wxLongLong GetValue() const; // a helper function to get the current time_t static time_t GetTimeNow() { return time((time_t *)NULL); } // another one to get the current time broken down static struct tm *GetTmNow() { time_t t = GetTimeNow(); return localtime(&t); } // get current time using thread-safe function static struct tm *GetTmNow(struct tm *tmstruct); private: // the current country - as it's the same for all program objects (unless // it runs on a _really_ big cluster system :-), this is a static member: // see SetCountry() and GetCountry() static Country ms_country; // this constant is used to transform a time_t value to the internal // representation, as time_t is in seconds and we use milliseconds it's // fixed to 1000 static const long TIME_T_FACTOR; // returns true if we fall in range in which we can use standard ANSI C // functions inline bool IsInStdRange() const; // the internal representation of the time is the amount of milliseconds // elapsed since the origin which is set by convention to the UNIX/C epoch // value: the midnight of January 1, 1970 (UTC) wxLongLong m_time; }; // ---------------------------------------------------------------------------- // This class contains a difference between 2 wxDateTime values, so it makes // sense to add it to wxDateTime and it is the result of subtraction of 2 // objects of that class. See also wxDateSpan. // ---------------------------------------------------------------------------- class WXDLLIMPEXP_BASE wxTimeSpan { public: // constructors // ------------------------------------------------------------------------ // return the timespan for the given number of seconds static wxTimeSpan Seconds(long sec) { return wxTimeSpan(0, 0, sec); } static wxTimeSpan Second() { return Seconds(1); } // return the timespan for the given number of minutes static wxTimeSpan Minutes(long min) { return wxTimeSpan(0, min, 0 ); } static wxTimeSpan Minute() { return Minutes(1); } // return the timespan for the given number of hours static wxTimeSpan Hours(long hours) { return wxTimeSpan(hours, 0, 0); } static wxTimeSpan Hour() { return Hours(1); } // return the timespan for the given number of days static wxTimeSpan Days(long days) { return Hours(24 * days); } static wxTimeSpan Day() { return Days(1); } // return the timespan for the given number of weeks static wxTimeSpan Weeks(long days) { return Days(7 * days); } static wxTimeSpan Week() { return Weeks(1); } // default ctor constructs the 0 time span wxTimeSpan() { } // from separate values for each component, date set to 0 (hours are // not restricted to 0..24 range, neither are minutes, seconds or // milliseconds) inline wxTimeSpan(long hours, long minutes = 0, long seconds = 0, long milliseconds = 0); // default copy ctor is ok // no dtor // arithmetics with time spans (see also below for more operators) // ------------------------------------------------------------------------ // return the sum of two timespans inline wxTimeSpan Add(const wxTimeSpan& diff) const; // add two timespans together inline wxTimeSpan& Add(const wxTimeSpan& diff); // add two timespans together wxTimeSpan& operator+=(const wxTimeSpan& diff) { return Add(diff); } inline wxTimeSpan operator+(const wxTimeSpan& ts) const { return wxTimeSpan(GetValue() + ts.GetValue()); } // return the difference of two timespans inline wxTimeSpan Subtract(const wxTimeSpan& diff) const; // subtract another timespan inline wxTimeSpan& Subtract(const wxTimeSpan& diff); // subtract another timespan wxTimeSpan& operator-=(const wxTimeSpan& diff) { return Subtract(diff); } inline wxTimeSpan operator-(const wxTimeSpan& ts) { return wxTimeSpan(GetValue() - ts.GetValue()); } // multiply timespan by a scalar inline wxTimeSpan Multiply(int n) const; // multiply timespan by a scalar inline wxTimeSpan& Multiply(int n); // multiply timespan by a scalar wxTimeSpan& operator*=(int n) { return Multiply(n); } inline wxTimeSpan operator*(int n) const { return wxTimeSpan(*this).Multiply(n); } // return this timespan with opposite sign wxTimeSpan Negate() const { return wxTimeSpan(-GetValue()); } // negate the value of the timespan wxTimeSpan& Neg() { m_diff = -GetValue(); return *this; } // negate the value of the timespan wxTimeSpan& operator-() { return Neg(); } // return the absolute value of the timespan: does _not_ modify the // object inline wxTimeSpan Abs() const; // there is intentionally no division because we don't want to // introduce rounding errors in time calculations // comparaison (see also operator versions below) // ------------------------------------------------------------------------ // is the timespan null? bool IsNull() const { return m_diff == 0l; } // returns true if the timespan is null bool operator!() const { return !IsNull(); } // is the timespan positive? bool IsPositive() const { return m_diff > 0l; } // is the timespan negative? bool IsNegative() const { return m_diff < 0l; } // are two timespans equal? inline bool IsEqualTo(const wxTimeSpan& ts) const; // compare two timestamps: works with the absolute values, i.e. -2 // hours is longer than 1 hour. Also, it will return false if the // timespans are equal in absolute value. inline bool IsLongerThan(const wxTimeSpan& ts) const; // compare two timestamps: works with the absolute values, i.e. 1 // hour is shorter than -2 hours. Also, it will return false if the // timespans are equal in absolute value. bool IsShorterThan(const wxTimeSpan& t) const { return !IsLongerThan(t); } inline bool operator<(const wxTimeSpan &ts) const { return GetValue() < ts.GetValue(); } inline bool operator<=(const wxTimeSpan &ts) const { return GetValue() <= ts.GetValue(); } inline bool operator>(const wxTimeSpan &ts) const { return GetValue() > ts.GetValue(); } inline bool operator>=(const wxTimeSpan &ts) const { return GetValue() >= ts.GetValue(); } inline bool operator==(const wxTimeSpan &ts) const { return GetValue() == ts.GetValue(); } inline bool operator!=(const wxTimeSpan &ts) const { return GetValue() != ts.GetValue(); } // breaking into days, hours, minutes and seconds // ------------------------------------------------------------------------ // get the max number of weeks in this timespan inline int GetWeeks() const; // get the max number of days in this timespan inline int GetDays() const; // get the max number of hours in this timespan inline int GetHours() const; // get the max number of minutes in this timespan inline int GetMinutes() const; // get the max number of seconds in this timespan inline wxLongLong GetSeconds() const; // get the number of milliseconds in this timespan wxLongLong GetMilliseconds() const { return m_diff; } // conversion to text // ------------------------------------------------------------------------ // this function accepts strftime()-like format string (default // argument corresponds to the preferred date and time representation // for the current locale) and returns the string containing the // resulting text representation. Notice that only some of format // specifiers valid for wxDateTime are valid for wxTimeSpan: hours, // minutes and seconds make sense, but not "PM/AM" string for example. wxString Format(const wxChar *format = wxDefaultTimeSpanFormat) const; // implementation // ------------------------------------------------------------------------ // construct from internal representation wxTimeSpan(const wxLongLong& diff) { m_diff = diff; } // get the internal representation wxLongLong GetValue() const { return m_diff; } private: // the (signed) time span in milliseconds wxLongLong m_diff; }; // ---------------------------------------------------------------------------- // This class is a "logical time span" and is useful for implementing program // logic for such things as "add one month to the date" which, in general, // doesn't mean to add 60*60*24*31 seconds to it, but to take the same date // the next month (to understand that this is indeed different consider adding // one month to Feb, 15 - we want to get Mar, 15, of course). // // When adding a month to the date, all lesser components (days, hours, ...) // won't be changed unless the resulting date would be invalid: for example, // Jan 31 + 1 month will be Feb 28, not (non existing) Feb 31. // // Because of this feature, adding and subtracting back again the same // wxDateSpan will *not*, in general give back the original date: Feb 28 - 1 // month will be Jan 28, not Jan 31! // // wxDateSpan can be either positive or negative. They may be // multiplied by scalars which multiply all deltas by the scalar: i.e. 2*(1 // month and 1 day) is 2 months and 2 days. They can be added together and // with wxDateTime or wxTimeSpan, but the type of result is different for each // case. // // Beware about weeks: if you specify both weeks and days, the total number of // days added will be 7*weeks + days! See also GetTotalDays() function. // // Equality operators are defined for wxDateSpans. Two datespans are equal if // they both give the same target date when added to *every* source date. // Thus wxDateSpan::Months(1) is not equal to wxDateSpan::Days(30), because // they not give the same date when added to 1 Feb. But wxDateSpan::Days(14) is // equal to wxDateSpan::Weeks(2) // // Finally, notice that for adding hours, minutes &c you don't need this // class: wxTimeSpan will do the job because there are no subtleties // associated with those. // ---------------------------------------------------------------------------- class WXDLLIMPEXP_BASE wxDateSpan { public: // constructors // ------------------------------------------------------------------------ // this many years/months/weeks/days wxDateSpan(int years = 0, int months = 0, int weeks = 0, int days = 0) { m_years = years; m_months = months; m_weeks = weeks; m_days = days; } // get an object for the given number of days static wxDateSpan Days(int days) { return wxDateSpan(0, 0, 0, days); } static wxDateSpan Day() { return Days(1); } // get an object for the given number of weeks static wxDateSpan Weeks(int weeks) { return wxDateSpan(0, 0, weeks, 0); } static wxDateSpan Week() { return Weeks(1); } // get an object for the given number of months static wxDateSpan Months(int mon) { return wxDateSpan(0, mon, 0, 0); } static wxDateSpan Month() { return Months(1); } // get an object for the given number of years static wxDateSpan Years(int years) { return wxDateSpan(years, 0, 0, 0); } static wxDateSpan Year() { return Years(1); } // default copy ctor is ok // no dtor // accessors (all SetXXX() return the (modified) wxDateSpan object) // ------------------------------------------------------------------------ // set number of years wxDateSpan& SetYears(int n) { m_years = n; return *this; } // set number of months wxDateSpan& SetMonths(int n) { m_months = n; return *this; } // set number of weeks wxDateSpan& SetWeeks(int n) { m_weeks = n; return *this; } // set number of days wxDateSpan& SetDays(int n) { m_days = n; return *this; } // get number of years int GetYears() const { return m_years; } // get number of months int GetMonths() const { return m_months; } // get number of weeks int GetWeeks() const { return m_weeks; } // get number of days int GetDays() const { return m_days; } // returns 7*GetWeeks() + GetDays() int GetTotalDays() const { return 7*m_weeks + m_days; } // arithmetics with date spans (see also below for more operators) // ------------------------------------------------------------------------ // return sum of two date spans inline wxDateSpan Add(const wxDateSpan& other) const; // add another wxDateSpan to us inline wxDateSpan& Add(const wxDateSpan& other); // add another wxDateSpan to us inline wxDateSpan& operator+=(const wxDateSpan& other); inline wxDateSpan operator+(const wxDateSpan& ds) const { return wxDateSpan(GetYears() + ds.GetYears(), GetMonths() + ds.GetMonths(), GetWeeks() + ds.GetWeeks(), GetDays() + ds.GetDays()); } // return difference of two date spans inline wxDateSpan Subtract(const wxDateSpan& other) const; // subtract another wxDateSpan from us inline wxDateSpan& Subtract(const wxDateSpan& other); // subtract another wxDateSpan from us inline wxDateSpan& operator-=(const wxDateSpan& other); inline wxDateSpan operator-(const wxDateSpan& ds) const { return wxDateSpan(GetYears() - ds.GetYears(), GetMonths() - ds.GetMonths(), GetWeeks() - ds.GetWeeks(), GetDays() - ds.GetDays()); } // return a copy of this time span with changed sign inline wxDateSpan Negate() const; // inverse the sign of this timespan inline wxDateSpan& Neg(); // inverse the sign of this timespan wxDateSpan& operator-() { return Neg(); } // return the date span proportional to this one with given factor inline wxDateSpan Multiply(int factor) const; // multiply all components by a (signed) number inline wxDateSpan& Multiply(int factor); // multiply all components by a (signed) number inline wxDateSpan& operator*=(int factor) { return Multiply(factor); } inline wxDateSpan operator*(int n) const { return wxDateSpan(*this).Multiply(n); } // ds1 == d2 if and only if for every wxDateTime t t + ds1 == t + ds2 inline bool operator==(const wxDateSpan& ds) const { return GetYears() == ds.GetYears() && GetMonths() == ds.GetMonths() && GetTotalDays() == ds.GetTotalDays(); } inline bool operator!=(const wxDateSpan& ds) const { return !(*this == ds); } private: int m_years, m_months, m_weeks, m_days; }; // ---------------------------------------------------------------------------- // wxDateTimeArray: array of dates. // ---------------------------------------------------------------------------- WX_DECLARE_USER_EXPORTED_OBJARRAY(wxDateTime, wxDateTimeArray, WXDLLIMPEXP_BASE); // ---------------------------------------------------------------------------- // wxDateTimeHolidayAuthority: an object of this class will decide whether a // given date is a holiday and is used by all functions working with "work // days". // // NB: the base class is an ABC, derived classes must implement the pure // virtual methods to work with the holidays they correspond to. // ---------------------------------------------------------------------------- class WXDLLIMPEXP_BASE wxDateTimeHolidayAuthority; WX_DEFINE_USER_EXPORTED_ARRAY_PTR(wxDateTimeHolidayAuthority *, wxHolidayAuthoritiesArray, class WXDLLIMPEXP_BASE); class wxDateTimeHolidaysModule; class WXDLLIMPEXP_BASE wxDateTimeHolidayAuthority { friend class wxDateTimeHolidaysModule; public: // returns true if the given date is a holiday static bool IsHoliday(const wxDateTime& dt); // fills the provided array with all holidays in the given range, returns // the number of them static size_t GetHolidaysInRange(const wxDateTime& dtStart, const wxDateTime& dtEnd, wxDateTimeArray& holidays); // clear the list of holiday authorities static void ClearAllAuthorities(); // add a new holiday authority (the pointer will be deleted by // wxDateTimeHolidayAuthority) static void AddAuthority(wxDateTimeHolidayAuthority *auth); // the base class must have a virtual dtor virtual ~wxDateTimeHolidayAuthority(); protected: // this function is called to determine whether a given day is a holiday virtual bool DoIsHoliday(const wxDateTime& dt) const = 0; // this function should fill the array with all holidays between the two // given dates - it is implemented in the base class, but in a very // inefficient way (it just iterates over all days and uses IsHoliday() for // each of them), so it must be overridden in the derived class where the // base class version may be explicitly used if needed // // returns the number of holidays in the given range and fills holidays // array virtual size_t DoGetHolidaysInRange(const wxDateTime& dtStart, const wxDateTime& dtEnd, wxDateTimeArray& holidays) const = 0; private: // all holiday authorities static wxHolidayAuthoritiesArray ms_authorities; }; // the holidays for this class are all Saturdays and Sundays class WXDLLIMPEXP_BASE wxDateTimeWorkDays : public wxDateTimeHolidayAuthority { protected: virtual bool DoIsHoliday(const wxDateTime& dt) const; virtual size_t DoGetHolidaysInRange(const wxDateTime& dtStart, const wxDateTime& dtEnd, wxDateTimeArray& holidays) const; }; // ============================================================================ // inline functions implementation // ============================================================================ // ---------------------------------------------------------------------------- // private macros // ---------------------------------------------------------------------------- #define MILLISECONDS_PER_DAY 86400000l // some broken compilers (HP-UX CC) refuse to compile the "normal" version, but // using a temp variable always might prevent other compilers from optimising // it away - hence use of this ugly macro #ifndef __HPUX__ #define MODIFY_AND_RETURN(op) return wxDateTime(*this).op #else #define MODIFY_AND_RETURN(op) wxDateTime dt(*this); dt.op; return dt #endif // ---------------------------------------------------------------------------- // wxDateTime construction // ---------------------------------------------------------------------------- inline bool wxDateTime::IsInStdRange() const { return m_time >= 0l && (m_time / TIME_T_FACTOR) < LONG_MAX; } /* static */ inline wxDateTime wxDateTime::Now() { struct tm tmstruct; return wxDateTime(*GetTmNow(&tmstruct)); } /* static */ inline wxDateTime wxDateTime::Today() { wxDateTime dt(Now()); dt.ResetTime(); return dt; } #if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400)) inline wxDateTime& wxDateTime::Set(time_t timet) { // assign first to avoid long multiplication overflow! m_time = timet - WX_TIME_BASE_OFFSET ; m_time *= TIME_T_FACTOR; return *this; } #endif inline wxDateTime& wxDateTime::SetToCurrent() { *this = Now(); return *this; } #if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400)) inline wxDateTime::wxDateTime(time_t timet) { Set(timet); } #endif inline wxDateTime::wxDateTime(const struct tm& tm) { Set(tm); } inline wxDateTime::wxDateTime(const Tm& tm) { Set(tm); } inline wxDateTime::wxDateTime(double jdn) { Set(jdn); } inline wxDateTime& wxDateTime::Set(const Tm& tm) { wxASSERT_MSG( tm.IsValid(), _T("invalid broken down date/time") ); return Set(tm.mday, (Month)tm.mon, tm.year, tm.hour, tm.min, tm.sec, tm.msec); } inline wxDateTime::wxDateTime(wxDateTime_t hour, wxDateTime_t minute, wxDateTime_t second, wxDateTime_t millisec) { Set(hour, minute, second, millisec); } inline wxDateTime::wxDateTime(wxDateTime_t day, Month month, int year, wxDateTime_t hour, wxDateTime_t minute, wxDateTime_t second, wxDateTime_t millisec) { Set(day, month, year, hour, minute, second, millisec); } // ---------------------------------------------------------------------------- // wxDateTime accessors // ---------------------------------------------------------------------------- inline wxLongLong wxDateTime::GetValue() const { wxASSERT_MSG( IsValid(), _T("invalid wxDateTime")); return m_time; } inline time_t wxDateTime::GetTicks() const { wxASSERT_MSG( IsValid(), _T("invalid wxDateTime")); if ( !IsInStdRange() ) { return (time_t)-1; } return (time_t)((m_time / (long)TIME_T_FACTOR).GetLo())+WX_TIME_BASE_OFFSET ; } inline bool wxDateTime::SetToLastWeekDay(WeekDay weekday, Month month, int year) { return SetToWeekDay(weekday, -1, month, year); } inline wxDateTime wxDateTime::GetWeekDayInSameWeek(WeekDay weekday, WeekFlags WXUNUSED(flags)) const { MODIFY_AND_RETURN( SetToWeekDayInSameWeek(weekday) ); } inline wxDateTime wxDateTime::GetNextWeekDay(WeekDay weekday) const { MODIFY_AND_RETURN( SetToNextWeekDay(weekday) ); } inline wxDateTime wxDateTime::GetPrevWeekDay(WeekDay weekday) const { MODIFY_AND_RETURN( SetToPrevWeekDay(weekday) ); } inline wxDateTime wxDateTime::GetWeekDay(WeekDay weekday, int n, Month month, int year) const { wxDateTime dt(*this); return dt.SetToWeekDay(weekday, n, month, year) ? dt : wxInvalidDateTime; } inline wxDateTime wxDateTime::GetLastWeekDay(WeekDay weekday, Month month, int year) { wxDateTime dt(*this); return dt.SetToLastWeekDay(weekday, month, year) ? dt : wxInvalidDateTime; } inline wxDateTime wxDateTime::GetLastMonthDay(Month month, int year) const { MODIFY_AND_RETURN( SetToLastMonthDay(month, year) ); } inline wxDateTime wxDateTime::GetYearDay(wxDateTime_t yday) const { MODIFY_AND_RETURN( SetToYearDay(yday) ); } // ---------------------------------------------------------------------------- // wxDateTime comparison // ---------------------------------------------------------------------------- inline bool wxDateTime::IsEqualTo(const wxDateTime& datetime) const { wxASSERT_MSG( IsValid() && datetime.IsValid(), _T("invalid wxDateTime")); return m_time == datetime.m_time; } inline bool wxDateTime::IsEarlierThan(const wxDateTime& datetime) const { wxASSERT_MSG( IsValid() && datetime.IsValid(), _T("invalid wxDateTime")); return m_time < datetime.m_time; } inline bool wxDateTime::IsLaterThan(const wxDateTime& datetime) const { wxASSERT_MSG( IsValid() && datetime.IsValid(), _T("invalid wxDateTime")); return m_time > datetime.m_time; } inline bool wxDateTime::IsStrictlyBetween(const wxDateTime& t1, const wxDateTime& t2) const { // no need for assert, will be checked by the functions we call return IsLaterThan(t1) && IsEarlierThan(t2); } inline bool wxDateTime::IsBetween(const wxDateTime& t1, const wxDateTime& t2) const { // no need for assert, will be checked by the functions we call return IsEqualTo(t1) || IsEqualTo(t2) || IsStrictlyBetween(t1, t2); } inline bool wxDateTime::IsSameDate(const wxDateTime& dt) const { Tm tm1 = GetTm(), tm2 = dt.GetTm(); return tm1.year == tm2.year && tm1.mon == tm2.mon && tm1.mday == tm2.mday; } inline bool wxDateTime::IsSameTime(const wxDateTime& dt) const { // notice that we can't do something like this: // // m_time % MILLISECONDS_PER_DAY == dt.m_time % MILLISECONDS_PER_DAY // // because we have also to deal with (possibly) different DST settings! Tm tm1 = GetTm(), tm2 = dt.GetTm(); return tm1.hour == tm2.hour && tm1.min == tm2.min && tm1.sec == tm2.sec && tm1.msec == tm2.msec; } inline bool wxDateTime::IsEqualUpTo(const wxDateTime& dt, const wxTimeSpan& ts) const { return IsBetween(dt.Subtract(ts), dt.Add(ts)); } // ---------------------------------------------------------------------------- // wxDateTime arithmetics // ---------------------------------------------------------------------------- inline wxDateTime wxDateTime::Add(const wxTimeSpan& diff) const { wxASSERT_MSG( IsValid(), _T("invalid wxDateTime")); return wxDateTime(m_time + diff.GetValue()); } inline wxDateTime& wxDateTime::Add(const wxTimeSpan& diff) { wxASSERT_MSG( IsValid(), _T("invalid wxDateTime")); m_time += diff.GetValue(); return *this; } inline wxDateTime& wxDateTime::operator+=(const wxTimeSpan& diff) { return Add(diff); } inline wxDateTime wxDateTime::Subtract(const wxTimeSpan& diff) const { wxASSERT_MSG( IsValid(), _T("invalid wxDateTime")); return wxDateTime(m_time - diff.GetValue()); } inline wxDateTime& wxDateTime::Subtract(const wxTimeSpan& diff) { wxASSERT_MSG( IsValid(), _T("invalid wxDateTime")); m_time -= diff.GetValue(); return *this; } inline wxDateTime& wxDateTime::operator-=(const wxTimeSpan& diff) { return Subtract(diff); } inline wxTimeSpan wxDateTime::Subtract(const wxDateTime& datetime) const { wxASSERT_MSG( IsValid() && datetime.IsValid(), _T("invalid wxDateTime")); return wxTimeSpan(GetValue() - datetime.GetValue()); } inline wxTimeSpan wxDateTime::operator-(const wxDateTime& dt2) const { return this->Subtract(dt2); } inline wxDateTime wxDateTime::Add(const wxDateSpan& diff) const { return wxDateTime(*this).Add(diff); } inline wxDateTime& wxDateTime::Subtract(const wxDateSpan& diff) { return Add(diff.Negate()); } inline wxDateTime wxDateTime::Subtract(const wxDateSpan& diff) const { return wxDateTime(*this).Subtract(diff); } inline wxDateTime& wxDateTime::operator-=(const wxDateSpan& diff) { return Subtract(diff); } inline wxDateTime& wxDateTime::operator+=(const wxDateSpan& diff) { return Add(diff); } // ---------------------------------------------------------------------------- // wxDateTime and timezones // ---------------------------------------------------------------------------- inline wxDateTime wxDateTime::ToTimezone(const wxDateTime::TimeZone& tz, bool noDST) const { MODIFY_AND_RETURN( MakeTimezone(tz, noDST) ); } inline wxDateTime wxDateTime::FromTimezone(const wxDateTime::TimeZone& tz, bool noDST) const { MODIFY_AND_RETURN( MakeFromTimezone(tz, noDST) ); } // ---------------------------------------------------------------------------- // wxTimeSpan construction // ---------------------------------------------------------------------------- inline wxTimeSpan::wxTimeSpan(long hours, long minutes, long seconds, long milliseconds) { // assign first to avoid precision loss m_diff = hours; m_diff *= 60l; m_diff += minutes; m_diff *= 60l; m_diff += seconds; m_diff *= 1000l; m_diff += milliseconds; } // ---------------------------------------------------------------------------- // wxTimeSpan accessors // ---------------------------------------------------------------------------- inline wxLongLong wxTimeSpan::GetSeconds() const { return m_diff / 1000l; } inline int wxTimeSpan::GetMinutes() const { return (GetSeconds() / 60l).GetLo(); } inline int wxTimeSpan::GetHours() const { return GetMinutes() / 60; } inline int wxTimeSpan::GetDays() const { return GetHours() / 24; } inline int wxTimeSpan::GetWeeks() const { return GetDays() / 7; } // ---------------------------------------------------------------------------- // wxTimeSpan arithmetics // ---------------------------------------------------------------------------- inline wxTimeSpan wxTimeSpan::Add(const wxTimeSpan& diff) const { return wxTimeSpan(m_diff + diff.GetValue()); } inline wxTimeSpan& wxTimeSpan::Add(const wxTimeSpan& diff) { m_diff += diff.GetValue(); return *this; } inline wxTimeSpan wxTimeSpan::Subtract(const wxTimeSpan& diff) const { return wxTimeSpan(m_diff - diff.GetValue()); } inline wxTimeSpan& wxTimeSpan::Subtract(const wxTimeSpan& diff) { m_diff -= diff.GetValue(); return *this; } inline wxTimeSpan& wxTimeSpan::Multiply(int n) { m_diff *= (long)n; return *this; } inline wxTimeSpan wxTimeSpan::Multiply(int n) const { return wxTimeSpan(m_diff * (long)n); } inline wxTimeSpan wxTimeSpan::Abs() const { return wxTimeSpan(GetValue().Abs()); } inline bool wxTimeSpan::IsEqualTo(const wxTimeSpan& ts) const { return GetValue() == ts.GetValue(); } inline bool wxTimeSpan::IsLongerThan(const wxTimeSpan& ts) const { return GetValue().Abs() > ts.GetValue().Abs(); } // ---------------------------------------------------------------------------- // wxDateSpan // ---------------------------------------------------------------------------- inline wxDateSpan& wxDateSpan::operator+=(const wxDateSpan& other) { m_years += other.m_years; m_months += other.m_months; m_weeks += other.m_weeks; m_days += other.m_days; return *this; } inline wxDateSpan& wxDateSpan::Add(const wxDateSpan& other) { return *this += other; } inline wxDateSpan wxDateSpan::Add(const wxDateSpan& other) const { wxDateSpan ds(*this); ds.Add(other); return ds; } inline wxDateSpan& wxDateSpan::Multiply(int factor) { m_years *= factor; m_months *= factor; m_weeks *= factor; m_days *= factor; return *this; } inline wxDateSpan wxDateSpan::Multiply(int factor) const { wxDateSpan ds(*this); ds.Multiply(factor); return ds; } inline wxDateSpan wxDateSpan::Negate() const { return wxDateSpan(-m_years, -m_months, -m_weeks, -m_days); } inline wxDateSpan& wxDateSpan::Neg() { m_years = -m_years; m_months = -m_months; m_weeks = -m_weeks; m_days = -m_days; return *this; } inline wxDateSpan& wxDateSpan::operator-=(const wxDateSpan& other) { return *this += other.Negate(); } inline wxDateSpan& wxDateSpan::Subtract(const wxDateSpan& other) { return *this -= other; } inline wxDateSpan wxDateSpan::Subtract(const wxDateSpan& other) const { wxDateSpan ds(*this); ds.Subtract(other); return ds; } #undef MILLISECONDS_PER_DAY #undef MODIFY_AND_RETURN // ============================================================================ // binary operators // ============================================================================ // ---------------------------------------------------------------------------- // wxTimeSpan operators // ---------------------------------------------------------------------------- wxTimeSpan WXDLLIMPEXP_BASE operator*(int n, const wxTimeSpan& ts); // ---------------------------------------------------------------------------- // wxDateSpan // ---------------------------------------------------------------------------- wxDateSpan WXDLLIMPEXP_BASE operator*(int n, const wxDateSpan& ds); // ============================================================================ // other helper functions // ============================================================================ // ---------------------------------------------------------------------------- // iteration helpers: can be used to write a for loop over enum variable like // this: // for ( m = wxDateTime::Jan; m < wxDateTime::Inv_Month; wxNextMonth(m) ) // ---------------------------------------------------------------------------- WXDLLIMPEXP_BASE void wxNextMonth(wxDateTime::Month& m); WXDLLIMPEXP_BASE void wxPrevMonth(wxDateTime::Month& m); WXDLLIMPEXP_BASE void wxNextWDay(wxDateTime::WeekDay& wd); WXDLLIMPEXP_BASE void wxPrevWDay(wxDateTime::WeekDay& wd); #endif // wxUSE_DATETIME #endif // _WX_DATETIME_H