diff --git a/lib/adhearsion/asterisk/call_controller_methods.rb b/lib/adhearsion/asterisk/call_controller_methods.rb
index f6f1def..5dde7e7 100644
--- a/lib/adhearsion/asterisk/call_controller_methods.rb
+++ b/lib/adhearsion/asterisk/call_controller_methods.rb
@@ -352,6 +352,7 @@ def play_time(*args)
                      format = 'BdY' unless format.present?
                      argument.to_time.to_i
                    end
+        format = "ABdY \'digits/at\' IMp" if format.empty?
 
         return false if epoch.nil?
 
diff --git a/spec/adhearsion/asterisk/call_controller_methods_spec.rb b/spec/adhearsion/asterisk/call_controller_methods_spec.rb
index 6ff92c7..625f567 100644
--- a/spec/adhearsion/asterisk/call_controller_methods_spec.rb
+++ b/spec/adhearsion/asterisk/call_controller_methods_spec.rb
@@ -437,7 +437,7 @@ module Adhearsion::Asterisk
         end
 
         it "if a Time object is passed in alone, SayUnixTime is sent with the argument and the default format" do
-          subject.should_receive(:execute).once.with("SayUnixTime", time.to_i, "", "")
+          subject.should_receive(:execute).once.with("SayUnixTime", time.to_i, "", "ABdY \'digits/at\' IMp")
           subject.play_time(time)
         end