MAGE-909: created at converted to UTC timestamp

Author: mrahman3177

Helper/AlgoliaHelper.php

@@ -590,6 +590,8 @@ protected function prepareRecords(array &$objects, string $indexName): void
         $modifiedIds = [];
         foreach ($objects as $key => &$object) {
             $object['algoliaLastUpdateAtCET'] = $currentCET;
+            // Convert created_at to UTC timestamp
+            $object['created_at'] = strtotime($object['created_at']);
 
             $previousObject = $object;