Add Solution.java for 1185.Day of the Week

Author: huaxu1024

solution/1185.Day of the Week/Solution2.java

@@ -0,0 +1,13 @@
+class Solution {
+
+    private final String[] week = new String[]{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
+
+    public String dayOfTheWeek(int day, int month, int year) {
+        // Zeller Formula
+        if(month == 1 || month == 2) {
+            month += 12;
+            year -= 1;
+        }
+        return week[(day +2*month+3*(month+1)/5+year+year/4-year/100+year/400+1) % 7];
+    }
+}