diff --git a/lib/replay/event_declarations.rb b/lib/replay/event_declarations.rb
index fe67b43..79c69de 100644
--- a/lib/replay/event_declarations.rb
+++ b/lib/replay/event_declarations.rb
@@ -22,7 +22,7 @@ def method_missing(name, *args)
     def declare_event(base, name, props)
       klass = Class.new do
         include Replay::EventDecorator
-
+        attribute :published_at, Time, default: lambda{|p,a| Time.now}
         values do
           props.keys.each do |prop|
             attribute prop, props[prop]
diff --git a/proofs/replay/publisher_proof.rb b/proofs/replay/publisher_proof.rb
index f75b3e0..9987203 100644
--- a/proofs/replay/publisher_proof.rb
+++ b/proofs/replay/publisher_proof.rb
@@ -28,6 +28,11 @@ def pkey
 end
 
 module ReplayTest::Proof
+  def sets_publish_time
+    publish SomeEvent(pid: 123)
+    events.last.published_at != nil && (Time.now - events.last.published_at) < 20
+  end
+
   def defines_events?
     self.class.const_defined?(:SomeEvent) && self.class.const_get(:SomeEvent).is_a?(Class)
   end
@@ -144,6 +149,11 @@ def published?; @published; end
   r.prove{ publish([]) == self}
 end
 
+proof "sets the publish time on events" do
+  r = ReplayTest.new
+  r.prove{ sets_publish_time }
+end
+
 proof "Can implement initializer with arguments" do
   r = ReplayTest.new(:foo)
   r.prove { pkey == :foo }