diff --git a/x-pack/plugins/observability/server/assets/ingest_templates/slo_pipeline_template.ts b/x-pack/plugins/observability/server/assets/ingest_templates/slo_pipeline_template.ts
index eafa7399a7c35..a02a4c737377e 100644
--- a/x-pack/plugins/observability/server/assets/ingest_templates/slo_pipeline_template.ts
+++ b/x-pack/plugins/observability/server/assets/ingest_templates/slo_pipeline_template.ts
@@ -16,6 +16,7 @@ export const getSLOPipelineTemplate = (id: string, indexNamePrefix: string) => (
         field: '@timestamp',
         index_name_prefix: indexNamePrefix,
         date_rounding: 'M',
+        date_formats: ['UNIX_MS', 'ISO8601', "yyyy-MM-dd'T'HH:mm:ss.SSSXX"],
       },
     },
   ],