diff --git a/src/utils/ui.ts b/src/utils/ui.ts
index 8cd7a10b..e9b1947f 100644
--- a/src/utils/ui.ts
+++ b/src/utils/ui.ts
@@ -72,7 +72,7 @@ export function setLang(lang: Lang): Lang {
   localStorage.setItem('currentLanguage', lang);
 
   // TODO: Make date time get locale from i18n instead of telling it to use specific lang.
-  setDateTimeLocale(lang === Lang.English ? 'en-us' : 'th-th');
+  setDateTimeLocale(lang === Lang.English ? 'en' : 'th');
 
   return lang;
 }