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wxDateTime progress: DST compuation, weekday computation, day-in-year and week

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number computations all implemented and seem to work


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5026 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
1999-12-17 19:56:32 +00:00
parent 3e1ed7d709
commit 239446b415
4 changed files with 695 additions and 45 deletions
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49
include/wx/datetime.h
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@@ -295,10 +295,22 @@ public:
{
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
};
@@ -393,7 +405,11 @@ public:
// 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);
@@ -431,14 +447,20 @@ public:
// locale, returns empty string on error
static wxString GetWeekDayName(WeekDay weekday, bool abbr = FALSE);
// 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();
@@ -600,6 +622,13 @@ public:
// 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;
@@ -624,6 +653,13 @@ public:
wxDateTime ToGMT() const { return ToTimezone(GMT0); }
wxDateTime& MakeGMT() { return MakeTimezone(GMT0); }
// 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
@@ -690,13 +726,6 @@ public:
// adoption of the Gregorian calendar is simply unknown.
bool IsGregorianDate(GregorianAdoption country = Gr_Standard) const;
// 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;
// comparison (see also functions below for operator versions)
// ------------------------------------------------------------------------