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wasprobot/gist:d2c5cf3ce15595cfa69cc272b95d6d20

Created November 30, 2020 14:59
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day of week 1901 - 2099 (js)
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gistfile1.txt
(((y-1901) + ((y-1901)/4 >> 0)) + (y%4 ? [0,3,3,6,1,4,6,2,5,0,3,5] : [0,3,4,0,2,5,0,3,6,1,4,6]) [m-1] + d + 1) % 7
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