Week formatter in Date filter does not comply to ISO8601

[yannickadam]

ISO8601 mandates that a week starts on Monday, and ends on Sunday.
See plunker here: http://plnkr.co/edit/897MdGDME67aIQmLpzqZ

Fix is proposed in pull request #10313

[pkozlowski-opensource]

Hmm, I wonder if this shouldn't this be Locale-dependent? ISO8601 is one thing but it seems like different countries are using different notation of the first day of a week. At the same time we don't seem to have this info in the locale files...

[yannickadam]

@pkozlowski-opensource
From Angular's doc for date filter:
'w': ISO-8601 week of year (0-53)
'ww': ISO-8601 week of year (00-53)

This is a fix to match the documentation. Afterward a specific mecanism could be implemented based on the starting day of the week, but there doesn`t seem to be any ISO standard about it.

Here: http://en.wikipedia.org/wiki/ISO_week_date
The article mentions that it is indeed a drawback of the standard : "Not all parts of the world have a work week that begins with Monday".

[pkozlowski-opensource]

@yannickadam OK, fair enough. Let's focus on your PR then!