Added warning in GsonBuilder regarding setting date format correctly.
diff --git a/gson/src/main/java/com/google/gson/GsonBuilder.java b/gson/src/main/java/com/google/gson/GsonBuilder.java
index 0d1686f..83eb711 100644
--- a/gson/src/main/java/com/google/gson/GsonBuilder.java
+++ b/gson/src/main/java/com/google/gson/GsonBuilder.java
@@ -51,7 +51,14 @@
* .create();
* </pre></p>
*
- * <p>NOTE: the order of invocation of configuration methods does not matter.</p>
+ * <p>NOTES:
+ * <ul>
+ * <li> the order of invocation of configuration methods does not matter.</li>
+ * <li> The default serialization of {@link Date} and its subclasses in Gson does
+ * not contain time-zone information. So, if you are using date/time instances,
+ * use {@code GsonBuilder} and its {@code setDateFormat} methods.</li>
+ * </ul>
+ * </p>
*
* @author Inderjeet Singh
* @author Joel Leitch
