Update day-of-the-week.py

Author: kamyu104

Python/day-of-the-week.py

@@ -17,5 +17,5 @@ def dayOfTheWeek(self, day, month, year):
             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]