--- old/src/java.base/share/classes/java/util/Date.java	2019-08-27 17:28:52.870324386 -0700
+++ new/src/java.base/share/classes/java/util/Date.java	2019-08-27 17:28:52.690324386 -0700
@@ -154,6 +154,7 @@
      * interoperability with JDK1.1. The Date was modified to write
      * and read only the UTC time.
      */
+    @java.io.Serial
     private static final long serialVersionUID = 7523967970034938905L;
 
     /**
@@ -1318,6 +1319,7 @@
      *             is emitted (long).  This represents the offset from
      *             January 1, 1970, 00:00:00 GMT in milliseconds.
      */
+    @java.io.Serial
     private void writeObject(ObjectOutputStream s)
          throws IOException
     {
@@ -1328,6 +1330,7 @@
     /**
      * Reconstitute this object from a stream (i.e., deserialize it).
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream s)
          throws IOException, ClassNotFoundException
     {