diff --git a/lib/clacks/activitypub/federator.ex b/lib/clacks/activitypub/federator.ex
index 93016dc..a8a2837 100644
--- a/lib/clacks/activitypub/federator.ex
+++ b/lib/clacks/activitypub/federator.ex
@@ -62,7 +62,8 @@ defmodule Clacks.ActivityPub.Federator do
       "(request-target)": "post #{inbox_path}",
       host: inbox_host,
       "content-length": byte_size(body),
-      digest: digest
+      digest: digest,
+      date: date
     }
 
     {private_key, key_id} = private_key_for_actor(actor_id)