diff --git a/src/routes/auth.rs b/src/routes/auth.rs
index 8e2f096..75b2358 100644
--- a/src/routes/auth.rs
+++ b/src/routes/auth.rs
@@ -62,7 +62,8 @@ async fn login<Repo: UserRepository + SessionRepository>(
 
     let token = session.token();
     let mut response: Response =
-        Json(json!({ "session_token": token, "expires_at": session.expires_at })).into_response();
+        Json(json!({ "session_token": token, "expires_at": session.expires_at.and_utc() }))
+            .into_response();
 
     response.headers_mut().insert(
         SET_COOKIE,