diff --git a/app/javascript/vue/protocol/step.vue b/app/javascript/vue/protocol/step.vue
index 2303a566c..95b8a7220 100644
--- a/app/javascript/vue/protocol/step.vue
+++ b/app/javascript/vue/protocol/step.vue
@@ -128,7 +128,7 @@
     </div>
     <div class="collapse in" :id="'stepBody' + step.id">
       <div class="step-elements">
-        <div class="step-timestamp">{{ i18n.t('protocols.steps.timestamp', {date: step.attributes.created_on, user: step.attributes.created_by}) }}</div>
+        <div class="step-timestamp">{{ i18n.t('protocols.steps.timestamp', {date: step.attributes.created_at, user: step.attributes.created_by}) }}</div>
         <template v-for="(element, index) in orderedElements">
           <component
             :is="elements[index].attributes.orderable_type"
diff --git a/app/serializers/step_serializer.rb b/app/serializers/step_serializer.rb
index 44c5d79a7..57911feef 100644
--- a/app/serializers/step_serializer.rb
+++ b/app/serializers/step_serializer.rb
@@ -8,7 +8,7 @@ class StepSerializer < ActiveModel::Serializer
 
   attributes :name, :position, :completed, :attachments_manageble, :urls, :assets_view_mode, :assets_order,
              :marvinjs_enabled, :bio_eddie_service_enabled, :bio_eddie_context, :marvinjs_context,
-             :wopi_enabled, :wopi_context, :comments_count, :unseen_comments, :storage_limit, :created_on,
+             :wopi_enabled, :wopi_context, :comments_count, :unseen_comments, :storage_limit, :created_at,
              :created_by
 
   def bio_eddie_service_enabled