Doomsday rule: Difference between revisions
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# Conway's doomsday algorithm
c, r = divrem(year, 100)
s, t = divrem(r, 12)
doomsday = (s + t + (t ÷ 4) + canchor) % 7
anchorday = (year % 4 != 0) || (r == 0 && year % 400 == 0) ? # leap year determination
nonleapyear_firstdoomsdays[month] : leapyear_firstdoomsdays[month]
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