Doomsday rule: Difference between revisions

Content added Content deleted

Inline

@@ Line 84: / Line 84: @@
     # Conway's doomsday algorithm
     c, r = divrem(year, 100)
+    s, t = divrem(r, 12)
-    canchor = (5 * (c % 4) + 2) % 7  # anchor for century
-    doomsday = ((r ÷ 12) + (r % 12) + ((r % 12) ÷ 4) + canchor) % 7
+    canchor = (5 * (c % 4) + 2) % 7  # anchor for centiry
+    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]