year & month replaced by yearMonth object

app/year-month/[id]/add/page.tsx

@@ -1,12 +1,11 @@
 import { addMonth } from '@/app/lib/actions/monthActions';
+import { parseYearMonth } from '@/app/lib/format';
 import { revalidatePath } from 'next/cache';
 import { redirect } from 'next/navigation';
 
 export default async function Page({ params:{ id } }: { params: { id:string } }) {
 
-    const [year, month] = id.split("-");
-
-    await addMonth(year, month);
+    await addMonth(parseYearMonth(id));
 
     revalidatePath('/');
     redirect(`/`);