Index: trunk/src/org/openstreetmap/josm/io/GpxWriter.java
===================================================================
--- trunk/src/org/openstreetmap/josm/io/GpxWriter.java	(revision 18205)
+++ trunk/src/org/openstreetmap/josm/io/GpxWriter.java	(revision 18206)
@@ -233,4 +233,6 @@
             simpleTag("keywords", data.getString(META_KEYWORDS));
         }
+
+        simpleTag("time", Instant.now().toString());
 
         Bounds bounds = data.recalculateBounds();