diff --git a/client/src/main.ts b/client/src/main.ts
index df15ebee..621bc22d 100644
--- a/client/src/main.ts
+++ b/client/src/main.ts
@@ -1,4 +1,6 @@
 import * as Sentry from "@sentry/vue";
+import dayjs from "dayjs";
+import "dayjs/locale/de";
 import * as log from "loglevel";
 import { createPinia } from "pinia";
 import { createApp, markRaw } from "vue";
@@ -37,8 +39,10 @@ Sentry.init({
 });
 
 // todo: define lang setup
-loadLocaleMessages("de").then(() => {
+const locale = "de";
+loadLocaleMessages(locale).then(() => {
   app.use(router);
+  dayjs.locale(locale);
 
   const pinia = createPinia();
   pinia.use(({ store }) => {