diff --git a/packages/ui/src/components/calendar/internal/DateUtils.ts b/packages/ui/src/components/calendar/internal/DateUtils.ts
index de2568ba3b..b16bfd0ad5 100644
--- a/packages/ui/src/components/calendar/internal/DateUtils.ts
+++ b/packages/ui/src/components/calendar/internal/DateUtils.ts
@@ -128,5 +128,5 @@ export function getFormattedDate (value: number | null): string {
 }
 
 export const getTimeZoneName = (): string => {
-  return Intl.DateTimeFormat().resolvedOptions().timeZone.split('/')[1]
+  return Intl.DateTimeFormat().resolvedOptions().timeZone?.split('/')[1] ?? ''
 }