// Name: datetime.h
// Purpose: interface of wxDateTime
// Author: wxWidgets team
-// RCS-ID: $Id$
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
Julian ///< calendar in use since -45 until the 1582 (or later)
};
- /**
- Values corresponding to different dates of adoption of the Gregorian
- calendar.
-
- @see IsGregorianDate
- */
- 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
-
- /**
- Special case of Groningen.
-
- 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 was followed
- by 12 Jan 1701 -- which is the date we take into account 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,
-
- /**
- Special case of Sweden.
-
- 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 and this is what we use here.
- */
- 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
- };
-
/**
Date calculations often depend on the country and wxDateTime allows to set
the country whose conventions should be used using SetCountry(). It takes
/**
Constructs the object from @a timet value holding the number of seconds
- since Jan 1, 1970.
+ since Jan 1, 1970 UTC.
+
+ If @a timet is invalid, i.e. @code (time_t)-1 @endcode, wxDateTime
+ becomes invalid too, i.e. its IsValid() will return @false.
*/
wxDateTime& Set(time_t timet);
/**
unsigned short GetSecond(const TimeZone& tz = Local) const;
/**
- Returns the number of seconds since Jan 1, 1970. An assert failure will
- occur if the date is not in the range covered by @c time_t type.
+ Returns the number of seconds since Jan 1, 1970 UTC.
+
+ An assert failure will occur if the date is not in the range covered by
+ @c time_t type, use GetValue() if you work with dates outside of it.
*/
time_t GetTicks() const;
*/
int GetYear(const TimeZone& tz = Local) const;
- /**
- Returns @true if the given date is later than the date of adoption of
- the Gregorian calendar in the given country (and hence the Gregorian
- calendar calculations make sense for it).
- */
- bool IsGregorianDate(GregorianAdoption country = Gr_Standard) const;
-
/**
Returns @true if the object represents a valid time moment.
*/
/**
Returns @true if the date is equal to another one up to the given time
- interval, i.e. if the absolute difference between the two dates is less
+ interval, i.e.\ if the absolute difference between the two dates is less
than this interval.
*/
bool IsEqualUpTo(const wxDateTime& dt, const wxTimeSpan& ts) const;
/**
Adds the given date span to this object.
*/
- wxDateTime Add(const wxDateSpan& diff);
+ wxDateTime& Add(const wxDateSpan& diff);
/**
Adds the given time span to this object.
*/
them as a wxTimeSpan.
*/
wxTimeSpan Subtract(const wxDateTime& dt) const;
+ /**
+ Returns the difference between this object and @a dt as a wxDateSpan.
+
+ This method allows to find the number of entire years, months, weeks and
+ days between @a dt and this date.
+
+ @since 2.9.5
+ */
+ wxDateSpan DiffAsDateSpan(const wxDateTime& dt) const;
/**
Adds the given date span to this object.
*/
wxDateTime& operator+=(const wxDateSpan& diff);
+ /**
+ Adds the given date span to this object.
+ */
+ wxDateTime operator+(const wxDateSpan& ds) const;
/**
Subtracts the given date span from this object.
*/
wxDateTime& operator-=(const wxDateSpan& diff);
+ /**
+ Subtracts the given date span from this object.
+ */
+ wxDateTime operator-(const wxDateSpan& ds) const;
/**
Adds the given time span to this object.
*/
wxDateTime& operator+=(const wxTimeSpan& diff);
+ /**
+ Adds the given time span to this object.
+ */
+ wxDateTime operator+(const wxTimeSpan& ts) const;
/**
Subtracts the given time span from this object.
*/
wxDateTime& operator-=(const wxTimeSpan& diff);
+ /**
+ Subtracts the given time span from this object.
+ */
+ wxDateTime operator-(const wxTimeSpan& ts) const;
+ /**
+ Subtracts another date from this one and returns the difference between
+ them as a wxTimeSpan.
+ */
+ wxTimeSpan operator-(const wxDateTime& dt2) const;
//@}
WeekFlags flags = Monday_First);
/**
- Sets the date to the day number @a yday in the same year (i.e., unlike
+ Sets the date to the day number @a yday in the same year (i.e.\ unlike
the other functions, this one does not use the current year). The day
number should be in the range 1-366 for the leap years and 1-365 for
the other ones.
/**
- Converts the year in absolute notation (i.e. a number which can be
+ Converts the year in absolute notation (i.e.\ a number which can be
negative, positive or zero) to the year in BC/AD notation. For the
positive years, nothing is done, but the year 0 is year 1 BC and so for
other years there is a difference of 1.
Country country = Country_Default);
/**
- Get the current century, i.e. first two digits of the year, in given
+ Get the current century, i.e.\ first two digits of the year, in given
calendar (only Gregorian is currently supported).
*/
static int GetCentury(int year);
/**
Returns the object corresponding to the midnight of the current day
- (i.e. the same as Now(), but the time part is set to 0).
+ (i.e.\ the same as Now(), but the time part is set to 0).
@see Now()
*/
*/
int GetMonths() const;
+ /**
+ Returns the combined number of months in this date span, counting both
+ years and months.
+
+ @see GetYears(), GetMonths()
+
+ @since 2.9.5
+ */
+ int GetTotalMonths() const;
+
/**
Returns the combined number of days in this date span, counting both
weeks and days. This doesn't take months or years into account.
bool IsEqualTo(const wxTimeSpan& ts) const;
/**
- Compares two timespans: works with the absolute values, i.e. -2 hours
+ Compares two timespans: 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.
*/
bool IsPositive() const;
/**
- Compares two timespans: works with the absolute values, i.e. 1 hour is
+ Compares two timespans: 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.
*/
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