diff --git a/bookstack/docker-compose.yml b/bookstack/docker-compose.yml
index ac63a73..13528ab 100644
--- a/bookstack/docker-compose.yml
+++ b/bookstack/docker-compose.yml
@@ -6,6 +6,7 @@ services:
     environment:
       - APP_URL=https://${DOMAIN}
       - NGINX_ENABLE_FASTCGI_HTTPS=True
+      - TZ=Europe/Berlin
       - DB_HOST=bookstack_db
       - DB_USER=${DB_USER}
       - DB_PASS=${DB_PASS}