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December 31, 2007 is Wednesday, so what day is December 31, 2006? What day is December 31, 2008?
2007 is a normal year with 365 days
365 △ 7 = 52 (weeks) So December 31, 2006 is Tuesday
2008 is a leap year with 366 days
366 △ 7 = 52 (weeks) So December 31, 2008 is Friday
November 16, 2011 is Wednesday. What day is December 18, 2011?
It's Sunday
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