diff --git a/2025/part1/section6/final/src/app/app.ts b/2025/part1/section6/final/src/app/app.ts
index 9be9bcb..91d8b86 100644
--- a/2025/part1/section6/final/src/app/app.ts
+++ b/2025/part1/section6/final/src/app/app.ts
@@ -14,7 +14,7 @@ export class App {
       return [
         ...currentTodoList,
         {
-          id: currentTodoList.length + 1,
+          id: Date.now(),
           value: this.inputText(),
         },
       ];
diff --git a/2025/part1/section7/final/src/app/app.ts b/2025/part1/section7/final/src/app/app.ts
index bd47683..e97ce1c 100644
--- a/2025/part1/section7/final/src/app/app.ts
+++ b/2025/part1/section7/final/src/app/app.ts
@@ -15,7 +15,7 @@ export class App {
       return [
         ...currentTodoList,
         {
-          id: currentTodoList.length + 1,
+          id: Date.now(),
           value: this.inputText(),
           isComplete: false,
         },
diff --git a/2025/part1/section7/starter/src/app/app.ts b/2025/part1/section7/starter/src/app/app.ts
index 9be9bcb..91d8b86 100644
--- a/2025/part1/section7/starter/src/app/app.ts
+++ b/2025/part1/section7/starter/src/app/app.ts
@@ -14,7 +14,7 @@ export class App {
       return [
         ...currentTodoList,
         {
-          id: currentTodoList.length + 1,
+          id: Date.now(),
           value: this.inputText(),
         },
       ];