#pragma interface "datetime.h"
#endif
+#if wxUSE_DATETIME
+
#include <time.h>
#include <limits.h> // for INT_MIN
// performances and this only leads to increased rebuild time (because every
// time an inline method is changed, all files including the header must be
// rebuilt)
-#ifdef __WXDEBUG__
+// For Mingw32, causes a link error.
+#if defined( __WXDEBUG__) && !defined(__MINGW32__)
+ #undef inline
#define inline
#endif // Debug
+// 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
+
+#ifdef __WXMAC__
+#if __MSL__ < 0x6000
+ #define WX_TIME_BASE_OFFSET ( 2082844800L + 126144000L )
+#else
+ #define WX_TIME_BASE_OFFSET 0
+#endif
+#else
+ #define WX_TIME_BASE_OFFSET 0
+#endif
/*
- * TODO Well, everything :-)
+ * TODO
*
- * 1. Time zones with minutes (make wxTimeZone a class)
- * 2. getdate() function like under Solaris
- * 3. text conversion for wxDateSpan
+ * + 1. Time zones with minutes (make TimeZone a class)
+ * ? 2. getdate() function like under Solaris
+ * + 3. text conversion for wxDateSpan
+ * + 4. pluggable modules for the workdays calculations
+ * 5. wxDateTimeHolidayAuthority for Easter and other christian feasts
*/
/*
- The three classes declared in this header represent:
+ 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 + wxTimeSpan = wxTimeSpan
wxDateSpan + wxDateSpan = wxDateSpan
- substraction
+ 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 WXDLLEXPORT wxDateTime;
+
+WXDLLEXPORT_DATA(extern const wxDateTime) wxDefaultDateTime;
+#define wxInvalidDateTime wxDefaultDateTime
+
// ----------------------------------------------------------------------------
-// This class represents an absolute moment in the time
+// wxDateTime represents an absolute moment in the time
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxDateTime
// types
// ------------------------------------------------------------------------
- // a small unsigned integer type for storing things like seconds, days
- // of the week, &c. It should be at least short (i.e. not char) to
- // contain the number of milliseconds - it may also be 'int' because
- // there is no size penalty associated with it in our code, we don't
- // store any data in this format
+ // 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
{
// Note that GMT12 and GMT_12 are not the same: there is a difference
// of exactly one day between them
- // Universal Coordinated Time
+ // 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
-
- // TODO add symbolic names for TZ (EST, MET, ...)?
};
// the calendar systems we know about: notice that it's valid (for
{
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
};
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 WXDLLEXPORT 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
- struct Tm
+ //
+ // 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 WXDLLEXPORT Tm
{
- wxDateTime_t sec, min, hour,
- mday, mon, year;
+ 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
- Tm(const struct tm& 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;
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;
};
- // a class representing a time zone: basicly, this is just an offset
- // (in minutes) from GMT
- class TimeZone
- {
- public:
- TimeZone(TZ tz);
- TimeZone(wxDateTime_t offset) { m_offset = offset; }
-
- wxDateTime_t GetOffset() const { return m_offset; }
-
- private:
- // offset for this timezone from GMT in minutes
- wxDateTime_t m_offset;
- };
-
// static methods
// ------------------------------------------------------------------------
// set the current country
static void SetCountry(Country country);
// get the current country
- static inline Country GetCountry();
+ 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);
// get the full (default) or abbreviated month name in the current
// locale, returns empty string on error
- static wxString GetMonthName(Month month, bool abbr = FALSE);
+ 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, bool abbr = FALSE);
+ 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);
+ 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);
+ 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.
- //
- // All new wxDateTime correspond to the local time, use ToUTC() or
- // MakeUTC() to get the time in UTC/GMT.
// ------------------------------------------------------------------------
// default ctor does not initialize the object, use Set()!
- wxDateTime() { }
+ 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 millisec = 0);
// from separate values for each component with explicit date
inline wxDateTime(wxDateTime_t day, // day of the month
- Month month = Inv_Month,
+ Month month,
int year = Inv_Year, // 1999, not 99 please!
wxDateTime_t hour = 0,
wxDateTime_t minute = 0,
// 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,
// from separate values for each component with explicit date
// (defaults for month and year are the current values)
wxDateTime& Set(wxDateTime_t day,
- Month month = Inv_Month,
+ Month month,
int year = Inv_Year, // 1999, not 99 please!
wxDateTime_t hour = 0,
wxDateTime_t minute = 0,
// default assignment operator is ok
// calendar calculations (functions which set the date only leave the time
- // unchanged, e.g. don't explictly zero it)
+ // 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);
+ inline wxDateTime GetWeekDayInSameWeek(WeekDay weekday) 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
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)
bool SetToTheWeek(wxDateTime_t numWeek, WeekDay weekday = Mon);
+ inline wxDateTime GetWeek(wxDateTime_t numWeek, WeekDay weekday = Mon) const;
// 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
//
// 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
- long GetJulianDay() const;
+ // 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
- long GetRataDie() const;
+ 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: by default, we always work with local times, to get
- // anything else, it should be requested explicitly
+ // timezone stuff: a wxDateTime object constructed using given
+ // day/month/year/hour/min/sec values correspond to this moment in local
+ // time. Using the functions below, it may be converted to another time
+ // zone (for example, the Unix epoch is wxDateTime(1, Jan, 1970).ToGMT())
+ //
+ // 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.
+ //
+ // Converting to the local time zone doesn't do anything.
// ------------------------------------------------------------------------
- // get the time corresponding to this one in UTC/GMT
- wxDateTime ToUTC() const;
- wxDateTime ToGMT() const { return ToUTC(); }
+ // transform to any given timezone
+ inline wxDateTime ToTimezone(const TimeZone& tz, bool noDST = FALSE) const;
+ wxDateTime& MakeTimezone(const TimeZone& tz, bool noDST = FALSE);
- // transform this object to UTC/GMT
- wxDateTime& MakeUTC();
- wxDateTime& MakeGMT() { return MakeUTC(); }
+ // transform to GMT/UTC
+ wxDateTime ToGMT(bool noDST = FALSE) const { return ToTimezone(GMT0, noDST); }
+ wxDateTime& MakeGMT(bool noDST = FALSE) { return MakeTimezone(GMT0, noDST); }
- // generic version: transform time to any given timezone
- wxDateTime ToTimezone(const TimeZone& tz);
- wxDateTime& MakeTimezone(const TimeZone& tz);
+ // 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
// result of timezone shift)
// ------------------------------------------------------------------------
- // is the date valid (FALSE for uninitialized objects as well as after
- // the functions which failed to convert the date to supported range)
- inline bool IsValid() const { return this != &ms_InvDateTime; }
+ // is the date valid?
+ inline bool IsValid() const { return m_time != wxInvalidDateTime.m_time; }
- // get the broken down date/time representation
- Tm GetTm() const;
+ // 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 { return GetTm().year; }
+ int GetYear(const TimeZone& tz = Local) const
+ { return GetTm(tz).year; }
// get the month (Inv_Month if date is invalid)
- Month GetMonth() const { return (Month)GetTm().mon; }
+ 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 { return GetTm().mday; }
+ 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 { return GetTm().GetWeekDay(); }
+ WeekDay GetWeekDay(const TimeZone& tz = Local) const
+ { return GetTm(tz).GetWeekDay(); }
// get the hour of the day
- wxDateTime_t GetHour() const { return GetTm().hour; }
+ wxDateTime_t GetHour(const TimeZone& tz = Local) const
+ { return GetTm(tz).hour; }
// get the minute
- wxDateTime_t GetMinute() const { return GetTm().min; }
+ wxDateTime_t GetMinute(const TimeZone& tz = Local) const
+ { return GetTm(tz).min; }
// get the second
- wxDateTime_t GetSecond() const { return GetTm().sec; }
+ wxDateTime_t GetSecond(const TimeZone& tz = Local) const
+ { return GetTm(tz).sec; }
// get milliseconds
- wxDateTime_t GetMillisecond() const { return m_time.GetLo() % 1000; }
+ 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;
- // get the week number since the year start (1..52, 0 if date is
+ 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() const;
+ 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,
- TimeZone zone = Local) const;
+ 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 authoiruty in
+ // 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;
- // is daylight savings time in effect at this moment?
- //
- // 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, TimeZone zone = Local) const;
-
// comparison (see also functions below for operator versions)
// ------------------------------------------------------------------------
// returns TRUE if the two moments are strictly identical
inline bool IsEqualTo(const wxDateTime& datetime) const;
- // returns TRUE if the two moments are identical
- inline bool operator==(const wxDateTime& datetime) const;
-
- // returns TRUE if the two moments are different
- inline bool operator!=(const wxDateTime& datetime) const;
-
// returns TRUE if the date is strictly earlier than the given one
inline bool IsEarlierThan(const wxDateTime& datetime) const;
// returns TRUE if the date is in the given range
inline bool IsBetween(const wxDateTime& t1, const wxDateTime& t2) const;
- // date operations: for the non-const methods, the return value is this
- // object itself (see also functions below for operator versions)
+ // 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;
+
+ // 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);
- // substract a time span (positive or negative)
- inline wxDateTime& Substract(const wxTimeSpan& diff);
- // substract a time span (positive or negative)
+ // 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);
+ // 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);
- // substract a date span (positive or negative)
- inline wxDateTime& Substract(const wxDateSpan& diff);
- // substract a date span (positive or negative)
+ // 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);
- // substract a date (may result in positive or negative time span)
- inline wxTimeSpan Substract(const wxDateTime& datetime) const;
- // substract a date (may result in positive or negative time span)
- inline wxTimeSpan operator-(const wxDateTime& datetime) const;
+ // return the difference between two dates
+ inline wxTimeSpan Subtract(const wxDateTime& dt) const;
- // conversion to/from text: all conversions from text return TRUE on
- // success or FALSE if the date is malformed/out of supported range
+ // 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")
- bool ParseRfc822Date(const wxString& date);
- // parse a date/time in the given format (see strptime(3))
- bool ParseFormat(const wxString& date, const char *format = "%c");
+ 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 = _T("%c"),
+ 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
- // (and return FALSE if it fails)
- bool ParseDateTime(const wxString& date);
+ 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 = _T("%c")) const;
+ wxString Format(const wxChar *format = _T("%c"),
+ const TimeZone& tz = Local) const;
// preferred date representation for the current locale
wxString FormatDate() const { return Format(_T("%x")); }
// preferred time representation for the current locale
wxString FormatTime() const { return Format(_T("%X")); }
+ // 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;
// this constant is used to transform a time_t value to the internal
// representation, as time_t is in seconds and we use milliseconds it's
// fixed to 1000
- static const unsigned int TIME_T_FACTOR;
-
- // invalid wxDateTime object - returned by all functions which return
- // "wxDateTime &" on failure
- static wxDateTime ms_InvDateTime;
+ static const long TIME_T_FACTOR;
// returns TRUE if we fall in range in which we can use standard ANSI C
// functions
- inline IsInStdRange() const;
+ 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
// ----------------------------------------------------------------------------
// This class contains a difference between 2 wxDateTime values, so it makes
-// sense to add it to wxDateTime and it is the result of substraction of 2
+// sense to add it to wxDateTime and it is the result of subtraction of 2
// objects of that class. See also wxDateSpan.
// ----------------------------------------------------------------------------
// 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)
- wxTimeSpan(int hours,
- int minutes = 0,
- int seconds = 0,
- int milliseconds = 0);
- // from separate values for each component with explicit date (none of
- // the parameters isn't restricted to any range)
- wxTimeSpan(int years,
- int months,
- int days,
- int hours = 0,
- int minutes = 0,
- int seconds = 0,
- int milliseconds = 0);
-
- // from internal representation
- wxTimeSpan(wxLongLong diff) : m_diff(diff) { }
+ inline wxTimeSpan(long hours,
+ long minutes = 0,
+ long seconds = 0,
+ long milliseconds = 0);
// default copy ctor is ok
// no dtor
- // arithmetics with time spans
+ // 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); }
- // substract another timespan
- inline wxTimeSpan& Substract(const wxTimeSpan& diff);
- // substract another timespan
- wxTimeSpan& operator-=(const wxTimeSpan& diff) { return Substract(diff); }
+ // 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); }
+ // 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); }
- // multiply timespan by a scalar
- inline wxTimeSpan operator*(int n) const;
// return this timespan with inversed sign
wxTimeSpan Negate() const { return wxTimeSpan(-GetValue()); }
// timespans are equal in absolute value.
bool IsShorterThan(const wxTimeSpan& t) const { return !IsLongerThan(t); }
- // breaking into years, ..., days, ..., seconds: all these functions
- // behave like GetYears() which returns 1 for the timespan of 1 year and 1
- // day, but 0 (and not -1) for the negative timespan of 1 year without 1
- // day. IOW, (ts - wxTimeSpan(ts.GetYears())).GetYears() is always 0.
+ // breaking into days, hours, minutes and seconds
// ------------------------------------------------------------------------
- // get the max number of years in this timespan
- inline int GetYears() const;
- // get the max number of months in this timespan
- inline int GetMonths() const;
// get the max number of weeks in this timespan
inline int GetWeeks() const;
// get the max number of days in this timespan
// get the max number of minutes in this timespan
inline int GetMinutes() const;
// get the max number of seconds in this timespan
- inline int GetSeconds() const;
+ inline wxLongLong GetSeconds() const;
// get the number of milliseconds in this timespan
wxLongLong GetMilliseconds() const { return m_diff; }
// 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 char *format = "%c") const;
- // preferred date representation for the current locale
- wxString FormatDate() const { return Format("%x"); }
- // preferred time representation for the current locale
- wxString FormatTime() const { return Format("%X"); }
+ wxString Format(const wxChar *format = _T("%H:%M:%S")) const;
// implementation
// ------------------------------------------------------------------------
+ // construct from internal representation
+ wxTimeSpan(const wxLongLong& diff) { m_diff = diff; }
+
// get the internal representation
wxLongLong GetValue() const { return m_diff; }
// 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.
+// 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
// 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
// returns 7*GetWeeks() + GetDays()
int GetTotalDays() const { return 7*m_weeks + m_days; }
- // arithmetics
+ // 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);
- // substract another wxDateSpan from us
- inline wxDateSpan& Substract(const wxDateSpan& other);
- // substract another wxDateSpan from us
+ // 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);
// return a copy of this time span with changed sign
// 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);
+ inline wxDateSpan& operator*=(int factor) { return Multiply(factor); }
private:
int m_years,
m_days;
};
-WXDLLEXPORT_DATA(extern wxDateSpan) wxYear;
-WXDLLEXPORT_DATA(extern wxDateSpan) wxMonth;
-WXDLLEXPORT_DATA(extern wxDateSpan) wxWeek;
-WXDLLEXPORT_DATA(extern wxDateSpan) wxDay;
+// ----------------------------------------------------------------------------
+// wxDateTimeArray: array of dates.
+// ----------------------------------------------------------------------------
+
+#include "wx/dynarray.h"
+
+WX_DECLARE_EXPORTED_OBJARRAY(wxDateTime, wxDateTimeArray);
+
+// ----------------------------------------------------------------------------
+// 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 WXDLLEXPORT wxDateTimeHolidayAuthority;
+WX_DEFINE_EXPORTED_ARRAY(wxDateTimeHolidayAuthority *, wxHolidayAuthoritiesArray);
+
+class wxDateTimeHolidaysModule;
+class WXDLLEXPORT 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);
+
+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 WXDLLEXPORT 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
// wxDateTime operators
// ----------------------------------------------------------------------------
-inline bool WXDLLEXPORT operator<(const wxDateTime &t1, const wxDateTime &t2)
+// arithmetics
+// -----------
+
+// no need to check for validity - the member functions we call will do it
+
+inline wxDateTime WXDLLEXPORT operator+(const wxDateTime& dt,
+ const wxTimeSpan& ts)
+{
+ return dt.Add(ts);
+}
+
+inline wxDateTime WXDLLEXPORT operator-(const wxDateTime& dt,
+ const wxTimeSpan& ts)
{
- wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
+ return dt.Subtract(ts);
+}
+
+inline wxDateTime WXDLLEXPORT operator+(const wxDateTime& dt,
+ const wxDateSpan& ds)
+{
+ return dt.Add(ds);
+}
+
+inline wxDateTime WXDLLEXPORT operator-(const wxDateTime& dt,
+ const wxDateSpan& ds)
+{
+ return dt.Subtract(ds);
+}
+
+inline wxTimeSpan WXDLLEXPORT operator-(const wxDateTime& dt1,
+ const wxDateTime& dt2)
+{
+ return dt1.Subtract(dt2);
+}
+
+// comparison
+// ----------
+
+inline bool WXDLLEXPORT operator<(const wxDateTime& t1, const wxDateTime& t2)
+{
+ wxASSERT_MSG( t1.IsValid() && t2.IsValid(), _T("invalid wxDateTime") );
return t1.GetValue() < t2.GetValue();
}
-inline bool WXDLLEXPORT operator<=(const wxDateTime &t1, const wxDateTime &t2)
+inline bool WXDLLEXPORT operator<=(const wxDateTime& t1, const wxDateTime& t2)
{
- wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
+ wxASSERT_MSG( t1.IsValid() && t2.IsValid(), _T("invalid wxDateTime") );
return t1.GetValue() <= t2.GetValue();
}
-inline bool WXDLLEXPORT operator>(const wxDateTime &t1, const wxDateTime &t2)
+inline bool WXDLLEXPORT operator>(const wxDateTime& t1, const wxDateTime& t2)
{
- wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
+ wxASSERT_MSG( t1.IsValid() && t2.IsValid(), _T("invalid wxDateTime") );
return t1.GetValue() > t2.GetValue();
}
-inline bool WXDLLEXPORT operator>=(const wxDateTime &t1, const wxDateTime &t2)
+inline bool WXDLLEXPORT operator>=(const wxDateTime& t1, const wxDateTime& t2)
{
- wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
+ wxASSERT_MSG( t1.IsValid() && t2.IsValid(), _T("invalid wxDateTime") );
return t1.GetValue() >= t2.GetValue();
}
-inline bool WXDLLEXPORT operator==(const wxDateTime &t1, const wxDateTime &t2)
+inline bool WXDLLEXPORT operator==(const wxDateTime& t1, const wxDateTime& t2)
{
- wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
+ wxASSERT_MSG( t1.IsValid() && t2.IsValid(), _T("invalid wxDateTime") );
return t1.GetValue() == t2.GetValue();
}
-inline bool WXDLLEXPORT operator!=(const wxDateTime &t1, const wxDateTime &t2)
+inline bool WXDLLEXPORT operator!=(const wxDateTime& t1, const wxDateTime& t2)
{
- wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
+ wxASSERT_MSG( t1.IsValid() && t2.IsValid(), _T("invalid wxDateTime") );
return t1.GetValue() != t2.GetValue();
}
-inline wxTimeSpan WXDLLEXPORT operator-(const wxDateTime &t1,
- const wxDateTime &t2)
-{
- wxASSERT_MSG( t1.IsValid() && t2.IsValid(), "invalid wxDateTime" );
-
- return wxTimeSpan(t1.GetValue() - t2.GetValue());
-}
-
// ----------------------------------------------------------------------------
// wxTimeSpan operators
// ----------------------------------------------------------------------------
+// arithmetics
+// -----------
+
inline wxTimeSpan WXDLLEXPORT operator+(const wxTimeSpan& ts1,
const wxTimeSpan& ts2)
{
return wxTimeSpan(ts1.GetValue() - ts2.GetValue());
}
+inline wxTimeSpan WXDLLEXPORT operator*(const wxTimeSpan& ts, int n)
+{
+ return wxTimeSpan(ts).Multiply(n);
+}
+
+inline wxTimeSpan WXDLLEXPORT operator*(int n, const wxTimeSpan& ts)
+{
+ return wxTimeSpan(ts).Multiply(n);
+}
+
+// comparison
+// ----------
+
inline bool WXDLLEXPORT operator<(const wxTimeSpan &t1, const wxTimeSpan &t2)
{
return t1.GetValue() < t2.GetValue();
// wxDateSpan
// ----------------------------------------------------------------------------
-inline WXDLLEXPORT wxDateSpan operator+(const wxDateSpan& rt1,
- const wxDateSpan& rt2)
+// arithmetics
+// -----------
+
+inline WXDLLEXPORT wxDateSpan operator+(const wxDateSpan& ds1,
+ const wxDateSpan& ds2)
+{
+ return wxDateSpan(ds1.GetYears() + ds2.GetYears(),
+ ds1.GetMonths() + ds2.GetMonths(),
+ ds1.GetWeeks() + ds2.GetWeeks(),
+ ds1.GetDays() + ds2.GetDays());
+}
+
+inline WXDLLEXPORT wxDateSpan operator-(const wxDateSpan& ds1,
+ const wxDateSpan& ds2)
+{
+ return wxDateSpan(ds1.GetYears() - ds2.GetYears(),
+ ds1.GetMonths() - ds2.GetMonths(),
+ ds1.GetWeeks() - ds2.GetWeeks(),
+ ds1.GetDays() - ds2.GetDays());
+}
+
+inline WXDLLEXPORT wxDateSpan operator*(const wxDateSpan& ds, int n)
+{
+ return wxDateSpan(ds).Multiply(n);
+}
+
+inline WXDLLEXPORT wxDateSpan operator*(int n, const wxDateSpan& ds)
+{
+ return wxDateSpan(ds).Multiply(n);
+}
+
+// ============================================================================
+// 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) )
+// ----------------------------------------------------------------------------
+
+inline WXDLLEXPORT void wxNextMonth(wxDateTime::Month& m)
{
- return wxDateSpan(rt1.GetYears() + rt2.GetYears(),
- rt1.GetMonths() + rt2.GetMonths(),
- rt1.GetWeeks() + rt2.GetWeeks(),
- rt1.GetDays() + rt2.GetDays());
+ wxASSERT_MSG( m < wxDateTime::Inv_Month, _T("invalid month") );
+
+ // no wrapping or the for loop above would never end!
+ m = (wxDateTime::Month)(m + 1);
}
+inline WXDLLEXPORT void wxPrevMonth(wxDateTime::Month& m)
+{
+ wxASSERT_MSG( m < wxDateTime::Inv_Month, _T("invalid month") );
+
+ m = m == wxDateTime::Jan ? wxDateTime::Inv_Month
+ : (wxDateTime::Month)(m - 1);
+}
+
+inline WXDLLEXPORT void wxNextWDay(wxDateTime::WeekDay& wd)
+{
+ wxASSERT_MSG( wd < wxDateTime::Inv_WeekDay, _T("invalid week day") );
+
+ // no wrapping or the for loop above would never end!
+ wd = (wxDateTime::WeekDay)(wd + 1);
+}
+
+inline WXDLLEXPORT void wxPrevWDay(wxDateTime::WeekDay& wd)
+{
+ wxASSERT_MSG( wd < wxDateTime::Inv_WeekDay, _T("invalid week day") );
+
+ wd = wd == wxDateTime::Sun ? wxDateTime::Inv_WeekDay
+ : (wxDateTime::WeekDay)(wd - 1);
+}
+
+#endif // wxUSE_DATETIME
+
#endif // _WX_DATETIME_H
projects / wxWidgets.git / blobdiff