add timezone offset to countdown

src/app/website/index/Countdown.svelte

@@ -17,7 +17,7 @@
   })} Uhr`;
 
   function getUntil(): [number, number, number, number] {
-    let diff = (end.getTime() - (start?.getTime() || Date.now())) / 1000;
+    let diff = (end.getTime() - (start?.getTime() || Date.now()) + end.getTimezoneOffset()) / 1000;
 
     return [
       Math.floor(diff / (60 * 60 * 24)),