diff --git a/api/task_views.py b/api/task_views.py
index 1f54960..ce3ee98 100644
--- a/api/task_views.py
+++ b/api/task_views.py
@@ -40,7 +40,7 @@ def get_tasks_by_user(user_id):
 def create_task():
     data = request.get_json()
     validate_task_data(data)
-    due_date = datetime.strptime(data['due_date'], '%d-%m-%Y %H:%M')
+    due_date = datetime.strptime(data['due_date'], '%Y-%m-%dT%H:%M')
     task = Task(title=data['title'], description=data['description'], due_date=due_date,
                 done=data['done'], user_id=get_jwt_identity())
 
@@ -69,7 +69,7 @@ def update_task(task_id):
         requested_value = request_data.get(field_name)
         if requested_value is None:
             continue
-        new_value = datetime.strptime(requested_value, '%d-%m-%Y %H:%M') \
+        new_value = datetime.strptime(requested_value, '%Y-%m-%dT%H:%M') \
             if field_name == 'due_date' else requested_value
         setattr(task, field_name, new_value)
     db.session.commit()
@@ -102,9 +102,9 @@ def validate_task_data(task):
     due_date = task.get('due_date')
     if due_date:
         try:
-            datetime.strptime(due_date, '%d-%m-%Y %H:%M')
+            datetime.strptime(due_date, '%Y-%m-%dT%H:%M')
         except ValueError:
-            abort(400, "Incorrect datetime format. Expected DD-MM-YYYY HH:MM")
+            abort(400, "Incorrect datetime format. Expected ISO format: YYYY-MM-DDTHH:MM")
     done = task.get('done')
     if done is not None and done not in (0, 1):
         abort(400, "Incorrect done field value. Expected 0 or 1")
diff --git a/frontend/src/pages/Tasks.tsx b/frontend/src/pages/Tasks.tsx
index 873b418..08bfa35 100644
--- a/frontend/src/pages/Tasks.tsx
+++ b/frontend/src/pages/Tasks.tsx
@@ -15,13 +15,6 @@ interface Task {
   done: boolean;
 }
 
-const formatDateForApi = (dateStr: string): string => {
-  const [datePart, timePart] = dateStr.split('T');
-  const [year, month, day] = datePart.split('-');
-  const [hours, minutes] = timePart.split(':');
-  return `${day}-${month}-${year} ${hours}:${minutes}`;
-}
-
 const Tasks = () => {
   const [tasks, setTasks] = useState<Task[]>([]);
   const [newTask, setNewTask] = useState({ title: "", description: "", due_date: "", done: false });
@@ -55,13 +48,7 @@ const Tasks = () => {
 
   const handleCreateTask = async () => {
     try {
-      const payload = {
-        ...newTask,
-        due_date: newTask.due_date
-          ? formatDateForApi(newTask.due_date)
-          : "",
-      };
-      const task = await createTask(payload);
+      const task = await createTask(newTask);
       setTasks([...tasks, task]); // List update
       setNewTask({ title: "", description: "", due_date: "", done: false }); // Form reset
     } catch (error) {
@@ -113,14 +100,7 @@ const Tasks = () => {
   
   const handleSaveEdit = async (taskId: number) => {
     try {
-      const payload = {
-        ...editedTask,
-        due_date: editedTask.due_date
-          ? formatDateForApi(editedTask.due_date)
-          : undefined,
-      };
-  
-      const response = await api.patch(`/tasks/${taskId}`, payload);
+      const response = await api.patch(`/tasks/${taskId}`, editedTask);
       setTasks(tasks.map((t) => (t.id === taskId ? response.data : t)));
       setEditingTaskId(null);
       setEditedTask({});