--- a/mercurial/commands.py	Tue Aug 17 08:38:31 2010 +0530
+++ b/mercurial/commands.py	Fri Aug 13 13:59:26 2010 -0400
@@ -3066,8 +3066,8 @@
     Returns 0 on success.
     """
 
-    if opts["date"]:
-        if opts["rev"]:
+    if opts.get("date"):
+        if opts.get("rev"):
             raise util.Abort(_("you can't specify a revision and a date"))
         opts["rev"] = cmdutil.finddate(ui, repo, opts["date"])