[Qt-interest] Iterate over weeks of a timespan

[ygor at comcast.net]

how about using the weekNumber of the endDate ?

 -------------- Original message ----------------------
From: Jorge Abrines <curruscataphractus at gmail.com>
> Hi Sven,
> 
> I think this snip attached may help you. Use 'qmake -project' to create sample 
> project, 'qmake && make' to build it.
> 
> Regards,
> 
> Jorge
> 
> PD: Reply on any questions
> 
> Sven Grunewaldt wrote:
> > Sven Grunewaldt schrieb:
> >> Hi,
> >>
> >> I need to iterate over all the weeks of a specific time period
> >> (f.e. 09.2006 to 06.2009)
> >>
> >> My current approach:
> >> 	int startYear = 2006;
> >> 	int startMonth = 9;
> >> 	int endYear = 2009;
> >> 	int endMonth = 6;
> >> 	QDate startDate = QDate(startYear, startMonth, 1);
> >> 	QDate endDate = QDate(endYear, endMonth, 30); // I know that the  day
> >> value here is stupid, it will be replaced by a Date Edit
> >>
> >> 	for (int i = startYear; i <= endYear; i++)
> >> 	{
> >> 		int firstWeek;
> >> 		int lastWeek;
> >>
> >> 		if (i == startYear)
> >> 			firstWeek = startDate.weekNumber();
> >> 		else
> >> 			firstWeek = QDate(i, 1, 1).weekNumber();
> >>
> >> 		if (i == endYear)
> >> 			lastWeek = endDate.weekNumber();
> >> 		else
> >> 			lastWeek = QDate(i, 12, 31).weekNumber();
> >> 		
> >> 		for (int j = firstWeek; j <= lastWeek; j++)
> >> 			do_something(i, j);
> >> 	}
> >>
> >> The first problem is:
> >> I can't figure out the last Week of a year.
> >>
> >> The second problem is:
> >> If the startMonth or endMonth happens to be at the very beginning or end
> >> of a year, the week could 53 for the startMonth or 1 for the endMonth,
> >> which breaks the whole for-loop.
> >> I think I can solve this for myself, I only mention it to avoid confusion.
> >>
> >> Sadly I'm at a complete loss how to solve this puzzle.
> >> It would be great if someone could give me a pointer how to do it correctly.
> >> Regards,
> >> Sven Grunewaldt
> >> _______________________________________________
> >> Qt-interest mailing list
> >> Qt-interest at trolltech.com
> >> http://lists.trolltech.com/mailman/listinfo/qt-interest
> > 
> > Oups, forgot to mention the position of the first problem.
> > It occures here when the loop is not in the end year:
> > 
> >> 		if (i == endYear)
> >> 			lastWeek = endDate.weekNumber();
> >> 		else
> >> 			lastWeek = QDate(i, 12, 31).weekNumber();
> > 
> > The last day of december could be the first week of the next year, but I
> > need the last week of year "i". At least in my approach...
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest
> > 


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From: Jorge Abrines <curruscataphractus at gmail.com>
Subject: Re: [Qt-interest] Iterate over weeks of a timespan
Date: Wed, 21 Jan 2009 15:23:20 +0000
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