diff --git a/apps/web/src/utils/dayjs.tsx b/apps/web/src/utils/dayjs.tsx
index 5820cfb80..24ae160e0 100644
--- a/apps/web/src/utils/dayjs.tsx
+++ b/apps/web/src/utils/dayjs.tsx
@@ -79,6 +79,11 @@ const dayjsLocales: Record<
     timeFormat: "hours24",
     import: () => import("dayjs/locale/hr"),
   },
+  ja: {
+    weekStart: 1,
+    timeFormat: "hours24",
+    import: () => import("dayjs/locale/ja"),
+  },
   it: {
     weekStart: 1,
     timeFormat: "hours24",
diff --git a/packages/languages/languages.json b/packages/languages/languages.json
index 83674960e..8487c1857 100644
--- a/packages/languages/languages.json
+++ b/packages/languages/languages.json
@@ -11,6 +11,7 @@
   "hr": "Hrvatski",
   "it": "Italiano",
   "hu": "Magyar",
+  "ja": "日本語",
   "nl": "Nederlands",
   "no": "Norsk",
   "pl": "Polski",