Doomsday Practice

What day of the week was it?

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· 0.0s

Your answer (keys 0–6, Sunday = 0)

    Date range

    The Gregorian calendar began on October 15, 1582, so no dates come before that.

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    Cheat sheet
    Century anchors1600, 2000 → Tue · 1700, 2100 → Sun · 1800, 2200 → Fri · 1900, 2300 → Wed (repeats every 400 years)
    Year's doomsdayLet y = last two digits. Add y ÷ 12, the remainder, and remainder ÷ 4 (whole numbers only) to the anchor, then take mod 7.
    Even months4/4, 6/6, 8/8, 10/10, 12/12
    "9-to-5 at 7-11"5/9, 9/5, 7/11, 11/7
    Jan / FebJan 3 (Jan 4 in leap years) · last day of February
    March3/14 (Pi Day), or think of it as "March 0", the last day of February