message: Update day-of-the-week.py
diff: @@ -17,5 +17,5 @@ class Solution(object):
  month += 12
  year -= 1
  c, y = divmod(year, 100)
  - w = (y + y//4 + c//4 - 2*c + 13*(month+1)//5 + day - 1) % 7
  + w = (c//4 - 2*c + y + y//4 + 13*(month+1)//5 + day - 1) % 7
  return DAYS[w]
  