diff --git a/app/services/irs_attempts_api/attempt_event.rb b/app/services/irs_attempts_api/attempt_event.rb
index 4eb04d7fb3c..d69d5b0cc46 100644
--- a/app/services/irs_attempts_api/attempt_event.rb
+++ b/app/services/irs_attempts_api/attempt_event.rb
@@ -70,7 +70,7 @@ def event_data
           'subject_type' => 'session',
           'session_id' => session_id,
         },
-        'occurred_at' => occurred_at.to_i,
+        'occurred_at' => occurred_at.to_f,
       }.merge(event_metadata || {})
     end
 
diff --git a/spec/services/irs_attempts_api/attempt_event_spec.rb b/spec/services/irs_attempts_api/attempt_event_spec.rb
index c075d89288e..01e55bd5e4e 100644
--- a/spec/services/irs_attempts_api/attempt_event_spec.rb
+++ b/spec/services/irs_attempts_api/attempt_event_spec.rb
@@ -54,7 +54,7 @@
         'subject_type' => 'session', 'session_id' => 'test-session-id',
       )
       expect(event_data['foo']).to eq('bar')
-      expect(event_data['occurred_at']).to eq(occurred_at.to_i)
+      expect(event_data['occurred_at']).to eq(occurred_at.to_f)
     end
   end