Update

src/finalexam/StandardIO/DateCalculation.java

@@ -20,7 +20,7 @@ public class DateCalculation {
         System.out.println(ans);
     }
 
-    public static boolean isLeapYear(int year) {
+    static boolean isLeapYear(int year) {
         return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
     }
 }