diff --git a/lib/date.js b/lib/date.js
index 06aaac13..578d9014 100644
--- a/lib/date.js
+++ b/lib/date.js
@@ -36,7 +36,7 @@ export function getLocalTime(t) {
   return addMinutes(new Date(t), new Date().getTimezoneOffset());
 }
 
-export function getDateRange(value, locale) {
+export function getDateRange(value, locale = 'en-US') {
   const now = new Date();
   const localeOptions = dateLocales[locale];