Index: /trunk/src/org/openstreetmap/josm/tools/Logging.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/tools/Logging.java	(revision 16904)
+++ /trunk/src/org/openstreetmap/josm/tools/Logging.java	(revision 16905)
@@ -51,4 +51,5 @@
     private static final Logger LOGGER = Logger.getAnonymousLogger();
     private static final RememberWarningHandler WARNINGS = new RememberWarningHandler();
+    private static final Stopwatch startup = Stopwatch.createStarted();
 
     /**
@@ -491,5 +492,5 @@
             }
 
-            String msg = getPrefix(record) + record.getMessage();
+            String msg = String.format("%09.3f %s%s", startup.elapsed() / 1000., getPrefix(record), record.getMessage());
 
             // Only remember first line of message