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format-dateTime-011 expects [2006-10-01T12:00:00: 5 This day is early in the month, so let's look at the previous month: September 2006: First Thursday is 2006-09-07, so week 1 is Mo, 2006-09-04 till Su, 2006-09-10 week 2 is Mo, 2006-09-11 till Su, 2006-09-17 week 3 is Mo, 2006-09-18 till Su, 2006-09-24 week 4 is Mo, 2006-09-25 till Su, 2006-09-31, but 2006-09-31 does not exists and Su is 2006-10-01 ! So it should be in week 4 not 5 Something similar seems to happen with [2007-07-01T12:00:00, 2008-03-01T12:00:00 and 2009-03-01T12:00:00
*** This bug has been marked as a duplicate of bug 29515 ***