diff --git a/packages/grafana-data/src/datetime/formats.ts b/packages/grafana-data/src/datetime/formats.ts
index cb26ee32716..df3711aabd0 100644
--- a/packages/grafana-data/src/datetime/formats.ts
+++ b/packages/grafana-data/src/datetime/formats.ts
@@ -92,12 +92,12 @@ export function localTimeFormat(
     return fallback ?? DEFAULT_SYSTEM_DATE_FORMAT;
   }
 
-  if (!locale) {
+  if (!locale && navigator) {
     locale = [...navigator.languages];
   }
 
   // https://momentjs.com/docs/#/displaying/format/
-  const dateTimeFormat = new Intl.DateTimeFormat(locale, options);
+  const dateTimeFormat = new Intl.DateTimeFormat(locale || undefined, options);
   const parts = dateTimeFormat.formatToParts(new Date());
   const hour12 = dateTimeFormat.resolvedOptions().hour12;