Update

src/finalexam/StandardIO/DateCalculation.java

@@ -0,0 +1,26 @@
+package finalexam.StandardIO;
+
+import java.util.Scanner;
+
+public class DateCalculation {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        String s = sc.nextLine();
+        String[] arr = s.split("[-]");
+        int year = Integer.parseInt(arr[0]);
+        int month = Integer.parseInt(arr[1]);
+        int day = Integer.parseInt(arr[2]);
+        int days[] = { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+        if (isLeapYear(year))
+            days[2] = 28;
+        int ans = day;
+        for (int i = 1; i < month; i++) {
+            ans += days[i];
+        }
+        System.out.println(ans);
+    }
+
+    public static boolean isLeapYear(int year) {
+        return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
+    }
+}