diff --git a/backend/controllers/sessionController.js b/backend/controllers/sessionController.js
new file mode 100644
index 0000000..6e93904
--- /dev/null
+++ b/backend/controllers/sessionController.js
@@ -0,0 +1,19 @@
+import sessionService from '../services/sessionService.js';
+
+const sessionController = {
+    async checkSession(req, res) {
+        try {
+            const isValid = await sessionService.isSessionValid(req);
+            if (isValid) {
+                res.status(200).json({ valid: true });
+            } else {
+                res.status(401).json({ valid: false, message: "Session abgelaufen" });
+            }
+        } catch (error) {
+            console.error("Fehler bei der Session-Überprüfung:", error);
+            res.status(500).json({ valid: false, message: "Serverfehler bei der Session-Überprüfung" });
+        }
+    }
+};
+
+export default sessionController;
diff --git a/backend/middleware/authMiddleware.js b/backend/middleware/authMiddleware.js
index 6f23479..aa62e4d 100644
--- a/backend/middleware/authMiddleware.js
+++ b/backend/middleware/authMiddleware.js
@@ -12,6 +12,7 @@ export const authenticate = async (req, res, next) => {
         } 
         next();
     } catch(error) {
+        console.log(error);
         return res.status(500).json({ error: 'Internal Server Error at auth' });
     }
 };
\ No newline at end of file
diff --git a/backend/routes/sessionRoutes.js b/backend/routes/sessionRoutes.js
new file mode 100644
index 0000000..5c0736b
--- /dev/null
+++ b/backend/routes/sessionRoutes.js
@@ -0,0 +1,9 @@
+import express from 'express';
+import { authenticate } from '../middleware/authMiddleware.js';
+import sessionController from '../controllers/sessionController.js';
+
+const router = express.Router();
+
+router.get('/status', authenticate, sessionController.checkSession);
+
+export default router;
diff --git a/backend/server.js b/backend/server.js
index 8ffa6a8..46b1825 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -26,6 +26,7 @@ import Season from './models/Season.js';
 import Location from './models/Location.js';
 import groupRoutes from './routes/groupRoutes.js';
 import diaryDateTagRoutes from './routes/diaryDateTagRoutes.js';
+import sessionRoutes from './routes/sessionRoutes.js';
 
 const app = express();
 const port = process.env.PORT || 3000;
@@ -51,6 +52,7 @@ app.use('/api/diary-date-activities', diaryDateActivityRoutes);
 app.use('/api/matches', matchRoutes);
 app.use('/api/group', groupRoutes);
 app.use('/api/diarydatetags', diaryDateTagRoutes);
+app.use('/api/session', sessionRoutes);
 
 app.use(express.static(path.join(__dirname, '../frontend/dist')));
 
diff --git a/backend/services/sessionService.js b/backend/services/sessionService.js
new file mode 100644
index 0000000..bcb1340
--- /dev/null
+++ b/backend/services/sessionService.js
@@ -0,0 +1,10 @@
+import { authenticate } from '../middleware/authMiddleware.js';
+
+const sessionService = {
+
+    async isSessionValid(req) {
+        return true;
+    }
+};
+
+export default sessionService;
diff --git a/frontend/public/sound/bell-123742.mp3 b/frontend/public/sound/bell-123742.mp3
new file mode 100644
index 0000000..3bccff4
Binary files /dev/null and b/frontend/public/sound/bell-123742.mp3 differ
diff --git a/frontend/public/sound/thump-105302.mp3 b/frontend/public/sound/thump-105302.mp3
new file mode 100644
index 0000000..9eb1ef6
Binary files /dev/null and b/frontend/public/sound/thump-105302.mp3 differ
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index acb0d7d..6f6e907 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -1,6 +1,5 @@
 <template>
   <div class="main">
-    <!-- Button zum Anzeigen/Ausblenden des Menüs auf mobilen Geräten -->
     <button class="menu-toggle" @click="toggleMenu">
       {{ isMenuOpen ? 'Menü schließen' : 'Menü öffnen' }}
     </button>
@@ -48,7 +47,8 @@ export default {
   data() {
     return {
       selectedClub: null,
-      isMenuOpen: false, 
+      isMenuOpen: false,
+      sessionInterval: null, 
     };
   },
   computed: {
@@ -68,21 +68,52 @@ export default {
   },
   methods: {
     ...mapActions(['setCurrentClub', 'setClubs', 'logout']),
+    
     loadClub() {
       this.setCurrentClub(this.currentClub);
       this.$router.push(`/showclub/${this.currentClub}`);
     },
+
     toggleMenu() {
-      this.isMenuOpen = !this.isMenuOpen; // Menü auf mobilen Geräten ein-/ausblenden
+      this.isMenuOpen = !this.isMenuOpen;
     },
-  },
-  async mounted() {
-    const response = await apiClient.get('/clubs');
-    this.setClubs(response.data);
-    if (this.currentClub) {
-      this.selectedClub = this.currentClub;
+
+    async checkSession() {
+      try {
+        const response = await apiClient.get('/session/status');
+        if (!response.data.valid) {
+          this.handleLogout();
+        }
+      } catch (error) {
+        console.error('Session check failed:', error);
+        this.handleLogout();
+      }
+    },
+
+    handleLogout() {
+      alert('Deine Sitzung ist abgelaufen. Du wirst abgemeldet.');
+      this.logout();
+      clearInterval(this.sessionInterval);
+      this.$router.push('/login');
     }
   },
+  async mounted() {
+    try {
+      const response = await apiClient.get('/clubs');
+      this.setClubs(response.data);
+      if (this.currentClub) {
+        this.selectedClub = this.currentClub;
+      }
+      this.checkSession();
+      this.sessionInterval = setInterval(this.checkSession, 5000);
+    } catch (error) {
+      this.setClubs([]);
+      this.selectedClub = null;
+    }
+  },
+  beforeUnmount() {
+    clearInterval(this.sessionInterval);
+  }
 };
 </script>
 
@@ -241,4 +272,5 @@ select {
     border-bottom: 1px solid #ddd;
   }
 }
+
 </style>
diff --git a/frontend/src/store.js b/frontend/src/store.js
index 0b5ee0c..759ef65 100644
--- a/frontend/src/store.js
+++ b/frontend/src/store.js
@@ -38,7 +38,7 @@ const store = createStore({
     clearToken(state) {
       state.token = null;
       localStorage.removeItem('token');
-      localStorage.removeItem('currentClub'); // Auch den aktuellen Club entfernen
+      localStorage.removeItem('currentClub'); 
     },
     clearUsername(state) {
       state.username = '';
@@ -58,6 +58,7 @@ const store = createStore({
       router.push("/"); 
       window.location.reload();
     },
+
     setCurrentClub({ commit }, club) {
       commit('setClub', club);
     },
diff --git a/frontend/src/views/ClubView.vue b/frontend/src/views/ClubView.vue
index d7b90c8..d582e69 100644
--- a/frontend/src/views/ClubView.vue
+++ b/frontend/src/views/ClubView.vue
@@ -14,7 +14,6 @@
             </div>
             <div>
                 <h3>Trainingstagebuch</h3>
-                <!-- Hier könntest du das Trainingstagebuch anzeigen -->
             </div>
         </div>
         <div v-else>
diff --git a/frontend/src/views/DiaryView.vue b/frontend/src/views/DiaryView.vue
index b36c9a6..2fb055a 100644
--- a/frontend/src/views/DiaryView.vue
+++ b/frontend/src/views/DiaryView.vue
@@ -303,6 +303,10 @@ export default {
             showTagHistoryModal: false,
             tagHistoryMember: null,
             tagHistory: null,
+            intermediateTimes: [],
+            bellSound: new Audio('/sound/bell-123742.mp3'),
+            thumbSound: new Audio('/sound/thump-105302.mp3'),
+            timeChecker: null,
         };
     },
     watch: {
@@ -362,10 +366,11 @@ export default {
                 this.trainingPlan = await apiClient
                     .get(`/diary-date-activities/${this.currentClub}/${this.date.id}`)
                     .then(response => response.data);
-
+                this.calculateIntermediateTimes();
                 this.initializeSortable();
                 await this.loadGroups();
                 this.showGeneralData = false;
+                this.startCheckingTime();
             } else {
                 this.newDate = '';
                 this.trainingStart = '';
@@ -699,6 +704,7 @@ export default {
                 this.addNewGroupActivity = false;
                 this.newPlanItem = { activity: '', duration: '', durationText: '', groupId: '' };
                 this.trainingPlan = await apiClient.get(`/diary-date-activities/${this.currentClub}/${this.date.id}`).then(response => response.data);
+                this.calculateIntermediateTimes();
             } catch (error) {
                 console.error('Fehler beim Hinzufügen des Planungsitems:', error);
                 alert('Ein Fehler ist aufgetreten. Bitte versuchen Sie es erneut.');
@@ -709,6 +715,7 @@ export default {
                 await apiClient.put(`/diary-date-activities/${this.currentClub}/${planItemId}/group`, {
                     groupId: groupId
                 });
+                this.calculateIntermediateTimes();
             } catch (error) {
                 console.error('Fehler beim Aktualisieren der Planungs-Item-Gruppe:', error);
             }
@@ -717,6 +724,7 @@ export default {
             try {
                 await apiClient.delete(`/diary-date-activities/${this.currentClub}/${planItemId}`);
                 this.trainingPlan = this.trainingPlan.filter(item => item.id !== planItemId);
+                this.calculateIntermediateTimes();
             } catch (error) {
                 console.error('Fehler beim Entfernen des Planungsitems:', error);
             }
@@ -965,10 +973,82 @@ export default {
                 await this.addNewTagForDay(tag);
             }
         },
+
+        startCheckingTime() {
+            if (this.timeChecker) clearInterval(this.timeChecker);
+            this.timeChecker = setInterval(() => {
+                const currentTime = new Date().toLocaleTimeString('de-DE', { hour: '2-digit', minute: '2-digit', second: '2-digit' });
+                if (!this.trainingStart || ! this.trainingEnd) {
+                    return;
+                }
+                let startCheckTime = this.trainingStart;
+                let endCheckTime = this.trainingEnd;
+                const startCheckTimeBlocks = startCheckTime.split(':');
+                if (startCheckTimeBlocks.length < 3) {
+                    startCheckTime = `${startCheckTime}:00`;
+                }
+                const endCheckTimeBlocks = endCheckTime.split(':');
+                if (endCheckTimeBlocks.length < 3) {
+                    endCheckTime = `${endCheckTime}:00`;
+                }
+                if (startCheckTime && currentTime === startCheckTime) {
+                    this.playBellSound();
+                }
+                if (endCheckTime && currentTime === endCheckTime) {
+                    this.playBellSound();
+                }
+                if (this.intermediateTimes.includes(currentTime)) {
+                    this.playThumbSound();
+                }
+            }, 1000);
+        },
+
+        playBellSound() {
+            this.bellSound.play()
+                .then(() => {
+                    console.log("Bell sound played successfully");
+                })
+                .catch(error => {
+                    console.error("Error playing bell sound:", error);
+                });
+        },
+
+        playThumbSound() {
+            this.thumbSound.play()
+                .then(() => {
+                    console.log("Thumb sound played successfully");
+                })
+                .catch(error => {
+                    console.error("Error playing thumb sound:", error);
+                });
+        },
+
+        calculateIntermediateTimes() {
+            if (!this.trainingPlan || this.trainingPlan.length === 0) {
+                this.intermediateTimes = [];
+                return;
+            }
+            let times = [];
+            let currentTime = new Date("2025-01-01 " + this.trainingStart);
+            this.trainingPlan.forEach(item => {
+                const rawItem = JSON.parse(JSON.stringify(item)); 
+                currentTime.setMinutes(currentTime.getMinutes() + item.duration);
+                times.push(currentTime.toTimeString({ hours: '2-digit', minutes: '2-digit', seconds: '2-digit' }).slice(0, 8));
+            });
+            times = [...new Set(times)].sort();
+            this.intermediateTimes = times.filter(time => 
+                time !== this.trainingStart && time !== this.trainingEnd
+            );
+        },
     },
     async mounted() {
         await this.init();
     },
+    beforeUnmount() {
+        if (this.timeChecker) {
+            clearInterval(this.timeChecker);
+        }
+    }
 };
 </script>
 
@@ -989,6 +1069,22 @@ h3 {
     display: block;
 }
 
+form {
+    margin-top: 20px;
+}
+
+form div {
+    margin-bottom: 10px;
+}
+
+button[type="button"] {
+    margin-left: 10px;
+}
+
+h3 {
+    display: block;
+}
+
 .columns {
     display: flex;
     justify-content: space-between;