diff --git a/src/dev.js b/src/dev.js
index 6219d05..b6d3f82 100644
--- a/src/dev.js
+++ b/src/dev.js
@@ -1,6 +1,8 @@
 import { getMensaBot } from "./bot.js";
+import process from "node:process";
 
 if (import.meta.main) {
+  process.env.TZ = "Europe/Berlin";
   const bot = getMensaBot(Deno.env.get("TELEGRAM_BOT_DEV_TOKEN"));
   bot.start();
 }
diff --git a/src/main.js b/src/main.js
index 51b9b1c..83353ad 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,7 +1,9 @@
 import { webhookCallback } from "grammy";
 import { getMensaBot } from "./bot.js";
+import process from "node:process";
 
 if (import.meta.main) {
+  process.env.TZ = "Europe/Berlin";
   const bot = getMensaBot(Deno.env.get("TELEGRAM_BOT_PROD_TOKEN"));
   const endpoint = "https://mensa-bot.deno.dev/" + bot.token;
   await bot.api.setWebhook(endpoint);