+// ----------------------------------------------------------------------------
+// Weekday and monthday stuff
+// ----------------------------------------------------------------------------
+
+wxDateTime& wxDateTime::SetToLastMonthDay(Month month,
+ int year)
+{
+ // take the current month/year if none specified
+ ReplaceDefaultYearMonthWithCurrent(&year, &month);
+
+ return Set(GetNumOfDaysInMonth(year, month), month, year);
+}
+
+bool wxDateTime::SetToWeekDay(WeekDay weekday,
+ int n,
+ Month month,
+ int year)
+{
+ wxCHECK_MSG( weekday != Inv_WeekDay, FALSE, _T("invalid weekday") );
+
+ // we don't check explicitly that -5 <= n <= 5 because we will return FALSE
+ // anyhow in such case - but may be should still give an assert for it?
+
+ // take the current month/year if none specified
+ ReplaceDefaultYearMonthWithCurrent(&year, &month);
+
+ wxDateTime dt;
+
+ // TODO this probably could be optimised somehow...
+
+ if ( n > 0 )
+ {
+ // get the first day of the month
+ dt.Set(1, month, year);
+
+ // get its wday
+ WeekDay wdayFirst = dt.GetWeekDay();
+
+ // go to the first weekday of the month
+ int diff = weekday - wdayFirst;
+ if ( diff < 0 )
+ diff += 7;
+
+ // add advance n-1 weeks more
+ diff += 7*(n - 1);
+
+ dt -= wxDateSpan::Days(diff);
+ }
+ else
+ {
+ // get the last day of the month
+ dt.SetToLastMonthDay(month, year);
+
+ // get its wday
+ WeekDay wdayLast = dt.GetWeekDay();
+
+ // go to the last weekday of the month
+ int diff = wdayLast - weekday;
+ if ( diff < 0 )
+ diff += 7;
+
+ // and rewind n-1 weeks from there
+ diff += 7*(n - 1);
+
+ dt -= wxDateSpan::Days(diff);
+ }
+
+ // check that it is still in the same month
+ if ( dt.GetMonth() == month )
+ {
+ *this = dt;
+
+ return TRUE;
+ }
+ else
+ {
+ // no such day in this month
+ return FALSE;
+ }
+}
+
+// ----------------------------------------------------------------------------
+// Julian day number conversion and related stuff
+// ----------------------------------------------------------------------------
+
+double wxDateTime::GetJulianDayNumber() const
+{
+ Tm tm(GetTm());
+
+ double result = GetTruncatedJDN(tm.mday, tm.mon, tm.year);
+
+ // add the part GetTruncatedJDN() neglected
+ result += 0.5;
+
+ // and now add the time: 86400 sec = 1 JDN
+ return result + ((double)(60*(60*tm.hour + tm.min) + tm.sec)) / 86400;
+}
+
+double wxDateTime::GetRataDie() const
+{
+ // March 1 of the year 0 is Rata Die day -306 and JDN 1721119.5
+ return GetJulianDayNumber() - 1721119.5 - 306;
+}
+
+// ----------------------------------------------------------------------------
+// timezone stuff
+// ----------------------------------------------------------------------------
+
+wxDateTime& wxDateTime::MakeUTC()
+{
+ return Add(wxTimeSpan::Seconds(GetTimeZone()));
+}
+
+wxDateTime& wxDateTime::MakeTimezone(const TimeZone& tz)
+{
+ int minDiff = GetTimeZone() / SECONDS_IN_MINUTE + tz.GetOffset();
+ return Add(wxTimeSpan::Minutes(minDiff));
+}
+
+wxDateTime& wxDateTime::MakeLocalTime(const TimeZone& tz)
+{
+ int minDiff = GetTimeZone() / SECONDS_IN_MINUTE + tz.GetOffset();
+ return Substract(wxTimeSpan::Minutes(minDiff));
+}
+
projects / wxWidgets.git / blobdiff