diff --git a/apps/api/src/lib/werktag.ts b/apps/api/src/lib/werktag.ts
index 8cd3c39..ce60696 100644
--- a/apps/api/src/lib/werktag.ts
+++ b/apps/api/src/lib/werktag.ts
@@ -74,7 +74,14 @@ export function berlinDayStartMs(iso: string): number {
     second: '2-digit',
   }).formatToParts(new Date(utcMidnight));
   const get = (t: string) => Number(parts.find((p) => p.type === t)?.value ?? '0');
-  const asIfUtc = Date.UTC(get('year'), get('month') - 1, get('day'), get('hour'), get('minute'), get('second'));
+  const asIfUtc = Date.UTC(
+    get('year'),
+    get('month') - 1,
+    get('day'),
+    get('hour'),
+    get('minute'),
+    get('second'),
+  );
   const offset = asIfUtc - utcMidnight; // ms, die Berlin der UTC voraus ist
   return utcMidnight - offset;
 }