diff --git a/Sprint-3/todo-list/02-guide_to_modularize_code.md b/Sprint-3/todo-list/02-guide_to_modularize_code.md
index ce90c3905..6c234b6fc 100644
--- a/Sprint-3/todo-list/02-guide_to_modularize_code.md
+++ b/Sprint-3/todo-list/02-guide_to_modularize_code.md
@@ -36,7 +36,7 @@ It focuses on:
 - ✅ What operations are needed to support data access and manipulation
 
 ### The UI Part of a Web App
-
+.
 This is the part of the app that interacts with the user interface (UI).
 
 It focuses on:
diff --git a/Sprint-3/todo-list/index.html b/Sprint-3/todo-list/index.html
index 4d12c4654..e5916ef4f 100644
--- a/Sprint-3/todo-list/index.html
+++ b/Sprint-3/todo-list/index.html
@@ -14,9 +14,12 @@
     <h1>My ToDo List</h1>
 
     <div class="todo-input">
-      <input type="text" id="new-task-input" placeholder="Enter a new task..." />
-      <button id="add-task-btn">Add</button>
-    </div>
+  <input type="text" id="new-task-input" placeholder="Enter a new task..." />
+  <input type="date" id="new-task-deadline" />
+  <button id="add-task-btn">Add</button>
+</div>
+
+    <button id="delete-completed-btn">Delete completed tasks</button>
 
     <ul id="todo-list" class="todo-list">      
     </ul>
@@ -26,15 +29,15 @@ <h1>My ToDo List</h1>
       It can simplify the creation of list item node in JS script.
     -->
     <template id="todo-item-template">
-      <li class="todo-item"> <!-- include class "completed" if the task completed state is true -->
-        <span class="description">Task description</span>
-        <div class="actions">
-          <button class="complete-btn"><span class="fa-solid fa-check" aria-hidden="true"></span></button>
-          <button class="delete-btn"><span class="fa-solid fa-trash" aria-hidden="true"></span></button>
-        </div>
-      </li>
-    </template>
+  <li class="todo-item">
+    <span class="description">Task description</span>
+    <span class="deadline"></span>
+    <div class="actions">
+      <button class="complete-btn"><span class="fa-solid fa-check" aria-hidden="true"></span></button>
+      <button class="delete-btn"><span class="fa-solid fa-trash" aria-hidden="true"></span></button>
+    </div>
+  </li>
+</template>
 
   </div>
-</body>
-</html>
+</body>
\ No newline at end of file
diff --git a/Sprint-3/todo-list/script.mjs b/Sprint-3/todo-list/script.mjs
index ba0b2ceae..54b9e9e37 100644
--- a/Sprint-3/todo-list/script.mjs
+++ b/Sprint-3/todo-list/script.mjs
@@ -7,6 +7,10 @@ const todos = [];
 // Set up tasks to be performed once on page load
 window.addEventListener("load", () => {
   document.getElementById("add-task-btn").addEventListener("click", addNewTodo);
+  document.getElementById("delete-completed-btn").addEventListener("click", () => {
+    Todos.deleteCompleted(todos);
+    render();
+  });
 
   // Populate sample data
   Todos.addTask(todos, "Wash the dishes", false); 
@@ -15,18 +19,19 @@ window.addEventListener("load", () => {
   render();
 });
 
-
 // A callback that reads the task description from an input field and 
 // append a new task to the todo list.
 function addNewTodo() {
   const taskInput = document.getElementById("new-task-input");
+  const deadlineInput = document.getElementById("new-task-deadline");
   const task = taskInput.value.trim();
+  const deadline = deadlineInput.value || null;
   if (task) {
-    Todos.addTask(todos, task, false);
+    Todos.addTask(todos, task, false, deadline);
     render();
   }
-
   taskInput.value = "";
+  deadlineInput.value = "";
 }
 
 // Note:
@@ -45,7 +50,6 @@ function render() {
   });
 }
 
-
 // Note:
 // - First child of #todo-item-template is a <li> element.
 //   We will create each ToDo list item as a clone of this node.
@@ -58,6 +62,9 @@ function createListItem(todo, index) {
   const li = todoListItemTemplate.cloneNode(true); // true => Do a deep copy of the node
 
   li.querySelector(".description").textContent = todo.task;
+  if (todo.deadline) {
+ li.querySelector(".deadline").textContent = Todos.getDeadlineStatus(todo.deadline);
+  }
   if (todo.completed) {
     li.classList.add("completed");
   }
diff --git a/Sprint-3/todo-list/todos.mjs b/Sprint-3/todo-list/todos.mjs
index f17ab6a25..e453b29e2 100644
--- a/Sprint-3/todo-list/todos.mjs
+++ b/Sprint-3/todo-list/todos.mjs
@@ -10,20 +10,44 @@
 */
 
 // Append a new task to todos[]
-export function addTask(todos, task, completed = false) {
-  todos.push({ task, completed });
+export function addTask(todos, task, completed = false, deadline = null) {
+  todos.push({ task, completed, deadline });
 }
 
-// Delete todos[taskIndex] if it exists
 export function deleteTask(todos, taskIndex) {
   if (todos[taskIndex]) {
     todos.splice(taskIndex, 1);
   }
 }
 
-// Toggle the "completed" property of todos[taskIndex] if the task exists.
 export function toggleCompletedOnTask(todos, taskIndex) {
   if (todos[taskIndex]) {
     todos[taskIndex].completed = !todos[taskIndex].completed;
   }
+}
+
+export function deleteCompleted(todos) {
+  for (let i = todos.length - 1; i >= 0; i--) {
+    if (todos[i].completed) {
+      todos.splice(i, 1);
+    }
+  }
+}
+// Return a human-readable string describing time left until deadline.
+// Returns null if there's no deadline.
+export function getDeadlineStatus(deadline) {
+  if (!deadline) return null;
+
+  const today = new Date();
+  today.setHours(0, 0, 0, 0);
+
+  const dueDate = new Date(deadline);
+  dueDate.setHours(0, 0, 0, 0);
+
+  const msPerDay = 1000 * 60 * 60 * 24;
+  const daysLeft = Math.round((dueDate - today) / msPerDay);
+
+  if (daysLeft > 0) return `Due in ${daysLeft} day${daysLeft === 1 ? "" : "s"}`;
+  if (daysLeft === 0) return "Due today";
+  return `Overdue by ${Math.abs(daysLeft)} day${Math.abs(daysLeft) === 1 ? "" : "s"}`;
 }
\ No newline at end of file
diff --git a/Sprint-3/todo-list/todos.test.mjs b/Sprint-3/todo-list/todos.test.mjs
index bae7ae491..2d3ee1d69 100644
--- a/Sprint-3/todo-list/todos.test.mjs
+++ b/Sprint-3/todo-list/todos.test.mjs
@@ -18,7 +18,7 @@ function createMockTodos() {
 }
 
 // A mock task to simulate user input
-const theTask = { task: "The Task", completed: false };
+const theTask = { task: "The Task", completed: false, deadline: null };
 
 describe("addTask()", () => {
   test("Add a task to an empty ToDo list", () => {
@@ -29,20 +29,15 @@ describe("addTask()", () => {
   });
 
   test("Should append a new task to the end of a ToDo list", () => {
-
     const todos = createMockTodos();
     const lengthBeforeAddition = todos.length;
     Todos.addTask(todos, theTask.task, theTask.completed);
-    // todos should now have one more task
     expect(todos).toHaveLength(lengthBeforeAddition + 1);
-
-    // New task should be appended to the todos
     expect(todos[todos.length - 1]).toEqual(theTask);
   });
 });
 
 describe("deleteTask()", () => {
-
   test("Delete the first task", () => {
     const todos = createMockTodos();
     const todosBeforeDeletion = createMockTodos();
@@ -50,7 +45,6 @@ describe("deleteTask()", () => {
     Todos.deleteTask(todos, 0);
 
     expect(todos).toHaveLength(lengthBeforeDeletion - 1);
-
     expect(todos[0]).toEqual(todosBeforeDeletion[1]);
     expect(todos[1]).toEqual(todosBeforeDeletion[2]);
     expect(todos[2]).toEqual(todosBeforeDeletion[3]);        
@@ -63,7 +57,6 @@ describe("deleteTask()", () => {
     Todos.deleteTask(todos, 1);
 
     expect(todos).toHaveLength(lengthBeforeDeletion - 1);
-
     expect(todos[0]).toEqual(todosBeforeDeletion[0]);
     expect(todos[1]).toEqual(todosBeforeDeletion[2]);
     expect(todos[2]).toEqual(todosBeforeDeletion[3]);        
@@ -76,7 +69,6 @@ describe("deleteTask()", () => {
     Todos.deleteTask(todos, todos.length - 1);
 
     expect(todos).toHaveLength(lengthBeforeDeletion - 1);
-
     expect(todos[0]).toEqual(todosBeforeDeletion[0]);
     expect(todos[1]).toEqual(todosBeforeDeletion[1]);
     expect(todos[2]).toEqual(todosBeforeDeletion[2]);        
@@ -94,7 +86,6 @@ describe("deleteTask()", () => {
 });
 
 describe("toggleCompletedOnTask()", () => {
-
   test("Expect the 'completed' property to toggle on an existing task", () => {
     const todos = createMockTodos();
     const taskIndex = 1;
@@ -102,7 +93,6 @@ describe("toggleCompletedOnTask()", () => {
     Todos.toggleCompletedOnTask(todos, taskIndex);
     expect(todos[taskIndex].completed).toEqual(!completedStateBeforeToggle);
 
-    // Toggle again
     Todos.toggleCompletedOnTask(todos, taskIndex);
     expect(todos[taskIndex].completed).toEqual(completedStateBeforeToggle);
   });
@@ -117,7 +107,6 @@ describe("toggleCompletedOnTask()", () => {
     expect(todos[3]).toEqual(todosBeforeToggle[3]);
   });
 
-
   test("Expect no change when toggling on a non-existing task", () => {
     const todos = createMockTodos();
     const todosBeforeToggle = createMockTodos();
@@ -130,3 +119,71 @@ describe("toggleCompletedOnTask()", () => {
   });
 });
 
+describe("deleteCompleted()", () => {
+  test("Should remove all completed tasks, keeping incomplete ones in order", () => {
+    const todos = createMockTodos();
+    const todosBeforeDeletion = createMockTodos();
+    Todos.deleteCompleted(todos);
+
+    expect(todos).toHaveLength(2);
+    expect(todos[0]).toEqual(todosBeforeDeletion[1]);
+    expect(todos[1]).toEqual(todosBeforeDeletion[3]);
+  });
+
+  test("Should result in an empty list if all tasks are completed", () => {
+    const todos = [
+      { task: "Task A", completed: true },
+      { task: "Task B", completed: true },
+    ];
+    Todos.deleteCompleted(todos);
+    expect(todos).toHaveLength(0);
+  });
+
+  test("Should leave the list unchanged if no tasks are completed", () => {
+    const todos = [
+      { task: "Task A", completed: false },
+      { task: "Task B", completed: false },
+    ];
+    const todosBeforeDeletion = [...todos];
+    Todos.deleteCompleted(todos);
+    expect(todos).toEqual(todosBeforeDeletion);
+  });
+
+  test("Should do nothing on an empty ToDo list", () => {
+    const todos = [];
+    Todos.deleteCompleted(todos);
+    expect(todos).toEqual([]);
+  });
+});
+
+describe("getDeadlineStatus()", () => {
+  test("Should return null when there is no deadline", () => {
+    expect(Todos.getDeadlineStatus(null)).toBeNull();
+  });
+
+  test("Should return 'Due today' when deadline is today", () => {
+    const today = new Date().toISOString().split("T")[0];
+    expect(Todos.getDeadlineStatus(today)).toBe("Due today");
+  });
+
+  test("Should return days remaining for a future deadline", () => {
+    const future = new Date();
+    future.setDate(future.getDate() + 3);
+    const futureStr = future.toISOString().split("T")[0];
+    expect(Todos.getDeadlineStatus(futureStr)).toBe("Due in 3 days");
+  });
+
+  test("Should return singular 'day' when exactly 1 day left", () => {
+    const tomorrow = new Date();
+    tomorrow.setDate(tomorrow.getDate() + 1);
+    const tomorrowStr = tomorrow.toISOString().split("T")[0];
+    expect(Todos.getDeadlineStatus(tomorrowStr)).toBe("Due in 1 day");
+  });
+
+  test("Should return overdue message for a past deadline", () => {
+    const past = new Date();
+    past.setDate(past.getDate() - 2);
+    const pastStr = past.toISOString().split("T")[0];
+    expect(Todos.getDeadlineStatus(pastStr)).toBe("Overdue by 2 days");
+  });
+});
\ No newline at end of file