Description:
------------
The Date function have a day of the week parameter 'w'

This parameter should return 7 for sundays, not 0 to be ISO 8601 compilant

Why

http://se.php.net/date :
> w   Numeric representation of the day of the week	
> 0 (for Sunday) through 6 (for Saturday)

This week parameter do not return leading zeros when used like Date('o\WWw'), Date('o\-\WW\-w')

According to ISO 8601 monday is the first day of the week and sunday the last, numbereded 1 to 7

(Section 5.2.3 Week date states
In expressions of week dates
- day of the week is represented by one decimal digit. Monday shall be identified as day [1] of any calendar
week, and subsequent days of the same week shall be numbered in ascending sequence to Sunday (day [7]).) like:

Date       - Week (extended format YYYY-Www-D)
---------- - ----------
1997-12-29 - 1998-W01-1
1998-01-04 - 1998-W01-7
1998-01-01 - 1998-W01-4
1998-12-31 - 1998-W53-4
1992-01-01 - 1992-W01-3
1992-02-29 - 1992-W09-6
1992-12-31 - 1992-W53-4
1975-01-01 - 1975-W01-3
1975-12-28 - 1975-W52-7
1975-12-29 - 1976-W01-1


Sources
Here's a copy of the latest free online copy
http://www.pvv.org/~nsaa/8601v2000.pdf, only minor changes in the text
in the latest version from ISO - also see
http://en.wikipedia.org/wiki/ISO_8601.


Reproduce code:
---------------
Echo Date('o\-\WW\-w', strtotime('2 January 2005'))
Date('o\-\WW\-w', strtotime('9 January 2005'));


Expected result:
----------------
2004-W53-7
2005-W01-7

Actual result:
--------------
2004-W53-0
2005-W1-0 (leading zeros in week fixed in bug report http://bugs.php.net/?id=34302)