Index: query.py
===================================================================
--- query.py	(revision 4008)
+++ query.py	(working copy)
@@ -175,7 +175,8 @@
                 elif name == 'reporter':
                     val = val or 'anonymous'
                 elif name in ['changetime', 'time']:
-                    val = int(val)
+                    from trac.util.datefmt import format_datetime
+                    val = format_datetime(val)
                 elif val is None:
                     val = '--'
                 result[name] = val