diff --git a/attached_assets/{4603FD9C-DCE9-469E-A659-47D34156686F}_1755586486756.png b/attached_assets/{4603FD9C-DCE9-469E-A659-47D34156686F}_1755586486756.png
new file mode 100644
index 0000000..15e719e
Binary files /dev/null and b/attached_assets/{4603FD9C-DCE9-469E-A659-47D34156686F}_1755586486756.png differ
diff --git a/client/src/components/tasks/TaskForm.tsx b/client/src/components/tasks/TaskForm.tsx
index e0b09e9..8e69a1e 100644
--- a/client/src/components/tasks/TaskForm.tsx
+++ b/client/src/components/tasks/TaskForm.tsx
@@ -134,7 +134,12 @@ export default function TaskForm({ task, onClose }: TaskFormProps) {
         createdBy: user?.id,
         dueDate: data.dueDate || null
       };
-      console.log('🚀 Creating task with data:', taskData);
+      console.log('🚀 Creating task with data:', {
+        ...taskData,
+        dueDate: taskData.dueDate,
+        dueDateType: typeof taskData.dueDate,
+        dueDateISO: taskData.dueDate?.toISOString?.()
+      });
       return apiRequest("/api/tasks", "POST", taskData);
     },
     onSuccess: () => {
@@ -156,7 +161,16 @@ export default function TaskForm({ task, onClose }: TaskFormProps) {
   });
 
   const updateMutation = useMutation({
-    mutationFn: (data: any) => apiRequest(`/api/tasks/${task?.id}`, "PUT", data),
+    mutationFn: (data: any) => {
+      console.log('🔄 Updating task with data:', {
+        taskId: task?.id,
+        data,
+        dueDate: data.dueDate,
+        dueDateType: typeof data.dueDate,
+        dueDateISO: data.dueDate?.toISOString?.()
+      });
+      return apiRequest(`/api/tasks/${task?.id}`, "PUT", data);
+    },
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ["/api/tasks"] });
       toast({
@@ -176,6 +190,17 @@ export default function TaskForm({ task, onClose }: TaskFormProps) {
   });
 
   const onSubmit = (data: TaskFormData) => {
+    // Debug: log des données de soumission
+    console.log('📝 TaskForm onSubmit:', {
+      isEdit: !!task,
+      taskId: task?.id,
+      formData: data,
+      dueDate: data.dueDate,
+      dueDateType: typeof data.dueDate,
+      dueDateISO: data.dueDate?.toISOString(),
+      localSelectedStoreId
+    });
+
     // Vérifier qu'un magasin est auto-sélectionné
     if (!localSelectedStoreId) {
       toast({
@@ -196,9 +221,11 @@ export default function TaskForm({ task, onClose }: TaskFormProps) {
         assignedTo: data.assignedTo,
         dueDate: data.dueDate || null,
       };
+      console.log('🔄 Update task submitData:', submitData);
       updateMutation.mutate(submitData);
     } else {
       // Création d'une nouvelle tâche - le groupId sera ajouté dans createMutation
+      console.log('➕ Create task data:', data);
       createMutation.mutate(data);
     }
   };
diff --git a/server/routes.ts b/server/routes.ts
index b4c6075..5db66c5 100644
--- a/server/routes.ts
+++ b/server/routes.ts
@@ -1390,6 +1390,14 @@ export async function registerRoutes(app: Express): Promise<Server> {
         createdBy: user.id,
       };
 
+      console.log('📝 POST /api/tasks - Received data:', {
+        originalBody: req.body,
+        processedData: data,
+        dueDate: data.dueDate,
+        dueDateType: typeof data.dueDate,
+        dueDateValue: data.dueDate
+      });
+
       // Check if user has access to the group
       if (user.role !== 'admin') {
         const userGroupIds = user.userGroups.map(ug => ug.groupId);
@@ -1399,6 +1407,12 @@ export async function registerRoutes(app: Express): Promise<Server> {
       }
 
       const task = await storage.createTask(data);
+      console.log('✅ Task created:', {
+        id: task.id,
+        title: task.title,
+        dueDate: task.dueDate,
+        dueDateType: typeof task.dueDate
+      });
       res.json(task);
     } catch (error) {
       console.error("Error creating task:", error);
@@ -1420,6 +1434,19 @@ export async function registerRoutes(app: Express): Promise<Server> {
         return res.status(404).json({ message: "Task not found" });
       }
 
+      console.log('🔄 PUT /api/tasks/:id - Received data:', {
+        taskId: id,
+        originalTask: {
+          id: task.id,
+          title: task.title,
+          dueDate: task.dueDate,
+          dueDateType: typeof task.dueDate
+        },
+        updateBody: req.body,
+        newDueDate: req.body.dueDate,
+        newDueDateType: typeof req.body.dueDate
+      });
+
       // Check permissions
       if (user.role !== 'admin') {
         const userGroupIds = user.userGroups.map(ug => ug.groupId);
@@ -1429,6 +1456,12 @@ export async function registerRoutes(app: Express): Promise<Server> {
       }
 
       const updatedTask = await storage.updateTask(id, req.body);
+      console.log('✅ Task updated:', {
+        id: updatedTask.id,
+        title: updatedTask.title,
+        dueDate: updatedTask.dueDate,
+        dueDateType: typeof updatedTask.dueDate
+      });
       res.json(updatedTask);
     } catch (error) {
       console.error("Error updating task:", error);
diff --git a/server/storage.ts b/server/storage.ts
index 800f06e..a8b9dcd 100644
--- a/server/storage.ts
+++ b/server/storage.ts
@@ -1622,16 +1622,47 @@ export class DatabaseStorage implements IStorage {
   }
 
   async createTask(taskData: InsertTask): Promise<Task> {
+    console.log('💾 DatabaseStorage.createTask - Input:', {
+      taskData,
+      dueDate: taskData.dueDate,
+      dueDateType: typeof taskData.dueDate,
+      dueDateISO: taskData.dueDate instanceof Date ? taskData.dueDate.toISOString() : taskData.dueDate
+    });
+    
     const [task] = await db.insert(tasks).values(taskData).returning();
+    
+    console.log('💾 DatabaseStorage.createTask - Result:', {
+      taskId: task.id,
+      title: task.title,
+      dueDate: task.dueDate,
+      dueDateType: typeof task.dueDate
+    });
+    
     return task;
   }
 
   async updateTask(id: number, taskData: Partial<InsertTask>): Promise<Task> {
+    console.log('💾 DatabaseStorage.updateTask - Input:', {
+      taskId: id,
+      taskData,
+      dueDate: taskData.dueDate,
+      dueDateType: typeof taskData.dueDate,
+      dueDateISO: taskData.dueDate instanceof Date ? taskData.dueDate.toISOString() : taskData.dueDate
+    });
+    
     const [task] = await db
       .update(tasks)
       .set({ ...taskData, updatedAt: new Date() })
       .where(eq(tasks.id, id))
       .returning();
+      
+    console.log('💾 DatabaseStorage.updateTask - Result:', {
+      taskId: task.id,
+      title: task.title,
+      dueDate: task.dueDate,
+      dueDateType: typeof task.dueDate
+    });
+    
     return task;
   }