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Gregorian - Monday-based, week 53, 1 month January 2010 Mo Tu We Th Fr Sa Su 53 1 2 3 1 4 5 6 7 8 9 10 2 11 12 13 14 15 16 17 3 18 19 20 21 22 23 24 4 25 26 27 28 29 30 31