So, what day of the week does Christmas day fall on?
  1. Select the year you are interested in. Break this into two parts: Century and Year.
    example: 2001 becomes C = 20, and Y becomes 01.
  2. Divide C by 4 and truncate. Store the result into K.
    example: K = C/4 = 20/4 = 5
  3. Divide Y by 4 and truncate. Store the result into G.
    example: G = Y/4 = 1/4 = 0
  4. D = 50 + Y + K + G - (2 * C)
    example: 50 + 1 + 5 + 0 – 40 = 16
  5. Take the remainder of D/7 (or take the modulo: D % 7) example: 16 % 7 = 2
  6. Lookup:
Please note that this applies only to the Gregorian calendar that was first introduced in 1582.

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