The twenty-eighth complete week in the year 2011 started on Monday July 11, and finishes on Sunday July 17.
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2012 was a leap year, so: from Sept 28 2011 to Sept 28 2012 is 366 days; and from Sept 28 2012 to Sept 28 2013 is 365 days; a total of 731 days. 7 days in a week, so: 731 days ÷ 7 days/week = 1043/7 weeks ie just under 1041/2 weeks.
November 28 1987 was on a Saturday.
February 28 1991 was a Thursday.
January 28 1997 was on a Tuesday.
August 28, 1957, was a Wednesday.