Bug #4460
closedDate.commercial date calculations don't match strftime output
Description
=begin
When retrieving the date for a week number using Date.commercial, the output sometimes differs from what you expect when looking at strftime. In my opinion, the following should always be true:
(({Date.commercial(year, week, day).strftime('%W') => week (String) }))
Which is in fact true today:
(({Date.today.strftime('%W') => "09"
Date.commercial(2011,9,1) => Mon, 28 Feb 2011
Date.today.at_beginning_of_week => Mon, 28 Feb 2011 }))
But not two years from now:
(({(Date.today+2.years).strftime("%W") => "08"
Date.commercial(2013,8,1) => Mon, 18 Feb 2013
(Date.today+2.years).at_beginning_of_week => Mon, 25 Feb 2013 }))
so:
(({Date.commercial(2013,8,1).strftime('%W') => "7"}))
I'm not quite sure why this is, but I think it's a bug and unfortunately it messes up some of my date calculations.
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