diff --git a/api/task_views.py b/api/task_views.py
index 2289247..1f54960 100644
--- a/api/task_views.py
+++ b/api/task_views.py
@@ -106,5 +106,5 @@ def validate_task_data(task):
         except ValueError:
             abort(400, "Incorrect datetime format. Expected DD-MM-YYYY HH:MM")
     done = task.get('done')
-    if done not in (0, 1):
+    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 d069dde..7cd3ad4 100644
--- a/frontend/src/pages/Tasks.tsx
+++ b/frontend/src/pages/Tasks.tsx
@@ -100,7 +100,24 @@ const Tasks = () => {
   
   const handleSaveEdit = async (taskId: number) => {
     try {
-      const response = await api.patch(`/tasks/${taskId}`, editedTask);
+      const formatDateForApi = (dateStr: string): string => {
+        const date = new Date(dateStr);
+        const day = String(date.getDate()).padStart(2, '0');
+        const month = String(date.getMonth() + 1).padStart(2, '0');
+        const year = date.getFullYear();
+        const hours = String(date.getHours()).padStart(2, '0');
+        const minutes = String(date.getMinutes()).padStart(2, '0');
+        return `${day}-${month}-${year} ${hours}:${minutes}`;
+      };
+  
+      const payload = {
+        ...editedTask,
+        due_date: editedTask.due_date
+          ? formatDateForApi(editedTask.due_date)
+          : undefined,
+      };
+  
+      const response = await api.patch(`/tasks/${taskId}`, payload);
       setTasks(tasks.map((t) => (t.id === taskId ? response.data : t)));
       setEditingTaskId(null);
       setEditedTask({});