diff --git a/app/ModelSerializers/SilverStripeSerializer.php b/app/ModelSerializers/SilverStripeSerializer.php
index dfc72d56..dec46830 100644
--- a/app/ModelSerializers/SilverStripeSerializer.php
+++ b/app/ModelSerializers/SilverStripeSerializer.php
@@ -21,7 +21,7 @@ class SilverStripeSerializer extends AbstractSerializer
     protected static $array_mappings = [
 
         'Id'         => 'id:json_int',
-        'Created'    => 'created:datetime_epoch',
-        'LastEdited' => 'last_edited:datetime_epoch',
+        'CreatedUTC' => 'created:datetime_epoch',
+        'LastEditedUTC' => 'last_edited:datetime_epoch',
     ];
 }
\ No newline at end of file
diff --git a/app/ModelSerializers/Summit/SummitEntityEventSerializer.php b/app/ModelSerializers/Summit/SummitEntityEventSerializer.php
index 114e34bc..32ebde7c 100644
--- a/app/ModelSerializers/Summit/SummitEntityEventSerializer.php
+++ b/app/ModelSerializers/Summit/SummitEntityEventSerializer.php
@@ -21,7 +21,6 @@ final class SummitEntityEventSerializer extends SilverStripeSerializer
     (
         'EntityId'        => 'entity_id:json_int',
         'EntityClassName' => 'class_name:json_string',
-        'CreatedUTC'      => 'created:datetime_epoch',
         'Type'            => 'type',
     );