diff --git a/README.md b/README.md
index 5f959cd..9832e16 100644
--- a/README.md
+++ b/README.md
@@ -62,7 +62,9 @@ Das Projekt ist für den Betrieb mit Docker optimiert.
    ```bash
    cp docker-compose.example.yml docker-compose.yml
    ```
-   Passe ggf. das `ADMIN_PASSWORD` in der `docker-compose.yml` an.
+   Passe die Umgebungsvariablen in der `docker-compose.yml` an:
+   - `ADMIN_PASSWORD`: Admin-Passwort (Standard: `admin123`)
+   - `TZ`: Zeitzone für täglichen Puzzle-Wechsel (Standard: `Europe/Berlin`)
 
 2. **Starten:**
    ```bash
diff --git a/app/api/daily/route.ts b/app/api/daily/route.ts
index 97a234f..85affeb 100644
--- a/app/api/daily/route.ts
+++ b/app/api/daily/route.ts
@@ -5,13 +5,22 @@ const prisma = new PrismaClient();
 
 export async function GET() {
     try {
-        const today = new Date().toISOString().split('T')[0];
+        // Use timezone from environment variable (default: Europe/Berlin)
+        const timezone = process.env.TZ || 'Europe/Berlin';
+        const today = new Date().toLocaleDateString('en-CA', {
+            timeZone: timezone,
+            year: 'numeric',
+            month: '2-digit',
+            day: '2-digit'
+        }); // Format: "2025-11-21"
 
         let dailyPuzzle = await prisma.dailyPuzzle.findUnique({
             where: { date: today },
             include: { song: true },
         });
 
+        console.log(`[Daily Puzzle] Date: ${today}, Found existing: ${!!dailyPuzzle}`);
+
         if (!dailyPuzzle) {
             // Get all songs with their usage count
             const allSongs = await prisma.song.findMany({
@@ -54,6 +63,8 @@ export async function GET() {
                 },
                 include: { song: true },
             });
+
+            console.log(`[Daily Puzzle] Created new puzzle for ${today} with song: ${selectedSong.title} (ID: ${selectedSong.id})`);
         }
 
         if (!dailyPuzzle) {
@@ -63,7 +74,10 @@ export async function GET() {
         return NextResponse.json({
             id: dailyPuzzle.id,
             audioUrl: `/uploads/${dailyPuzzle.song.filename}`,
-            songId: dailyPuzzle.songId
+            songId: dailyPuzzle.songId,
+            title: dailyPuzzle.song.title,
+            artist: dailyPuzzle.song.artist,
+            coverImage: dailyPuzzle.song.coverImage ? `/uploads/covers/${dailyPuzzle.song.coverImage}` : null,
         });
 
     } catch (error) {
diff --git a/docker-compose.example.yml b/docker-compose.example.yml
index 2e7bcf3..17ab75a 100644
--- a/docker-compose.example.yml
+++ b/docker-compose.example.yml
@@ -11,6 +11,7 @@ services:
     environment:
       - DATABASE_URL=file:/app/data/prod.db
       - ADMIN_PASSWORD=admin123 # Change this!
+      - TZ=Europe/Berlin # Timezone for daily puzzle rotation
     volumes:
       - ./data:/app/data
       - ./public/uploads:/app/public/uploads