Index: trunk/src/org/openstreetmap/josm/gui/download/BookmarkList.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/download/BookmarkList.java	(revision 17720)
+++ trunk/src/org/openstreetmap/josm/gui/download/BookmarkList.java	(revision 17721)
@@ -6,4 +6,5 @@
 import java.awt.Component;
 import java.awt.GraphicsEnvironment;
+import java.time.ZoneId;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -231,5 +232,5 @@
          */
         public ChangesetBookmark(Changeset cs) {
-            setName(String.format("%d - %tF - %s", cs.getId(), cs.getCreatedAt(), cs.getComment()));
+            setName(String.format("%d - %tF - %s", cs.getId(), cs.getCreatedAt().atZone(ZoneId.systemDefault()), cs.getComment()));
             setIcon(ImageProvider.get("data", "changeset", ImageSizes.SMALLICON));
             setArea(cs.getBounds());