Fix #4846: change SerializationFeature.WRITE_DURATIONS_AS_TIMESTAMPS to false for 3.0

Author: cowtowncoder

release-notes/VERSION

@@ -87,6 +87,8 @@ Versions: 3.x (for earlier see VERSION-2.x)
 #4820: Change JDK baseline for Jackson 3.0 from Java 8 to Java 17
 #4835: Remove dynamic work-arounds wrt accessing `Record` definition
 #4840: Increase minimum Android SDK required to 34 for Jackson 3.0
+#4846: Change default of `SerializationFeature.WRITE_DURATIONS_AS_TIMESTAMPS`
+  to `false` in 3.0
 #4858: Change default of `DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES`
   to `true` for 3.0
 #4875: Remove `JsonNode.fields()` from 3.0

src/main/java/tools/jackson/databind/SerializationFeature.java

@@ -255,13 +255,11 @@ public enum SerializationFeature implements ConfigFeature
      * representation may mean either simple number, or an array of numbers,
      * depending on type.
      *<p>
-     * Note: whether {@link java.util.Map} keys are serialized as Strings
-     * or not is controlled using {@link #WRITE_DATE_KEYS_AS_TIMESTAMPS}.
-     *<p>
-     * Feature is enabled by default, so that period/duration are by default
-     * serialized as timestamps.
+     * Feature is disabled by default as of Jackson 3.0 (in 2.x it was enabled),
+     * so that period/duration are by default serialized as textual values,
+     * NOT timestamps.
      */
-    WRITE_DURATIONS_AS_TIMESTAMPS(true),
+    WRITE_DURATIONS_AS_TIMESTAMPS(false),
 
     /**
      * Feature that determines how type <code>char[]</code> is serialized: