diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..352efe88a 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,6 +1,33 @@
-function setAlarm() {}
+function setAlarm() {
+  // get the value from input and show it in the h1
+  let input = document.getElementById("alarmSet").value;
+  let time = Number(input);
 
-// DO NOT EDIT BELOW HERE
+  document.getElementById(
+    "timeRemaining"
+  ).textContent = `Time Remaining: 00:${time.toString().padStart(2, "0")}`;
+  document.title = `Time Remaining: 00:${time.toString().padStart(2, "0")}`;
+
+  // start the countdown
+  const interval = setInterval(() => {
+    //decress the numnber
+    time--;
+
+    //update the h1
+    document.getElementById(
+      "timeRemaining"
+    ).textContent = `Time Remaining: 00:${time.toString().padStart(2, "0")}`;
+    document.title = `Time Remaining: 00:${time.toString().padStart(2, "0")}`;
+
+    //make sure just countdown to 0
+    if (time <= 0) {
+      clearInterval(interval);
+      playAlarm();
+    }
+  }, 1000);
+}
+
+// DO NOT EDIT BELOW.# HERE
 
 var audio = new Audio("alarmsound.mp3");
 
diff --git a/Sprint-3/alarmclock/index.html b/Sprint-3/alarmclock/index.html
index 48e2e80d9..2ef800b94 100644
--- a/Sprint-3/alarmclock/index.html
+++ b/Sprint-3/alarmclock/index.html
@@ -1,20 +1,23 @@
 <!DOCTYPE html>
 <html lang="en">
-  <head>
-    <meta charset="utf-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <link rel="stylesheet" href="style.css" />
-    <title>Title here</title>
-  </head>
-  <body>
-    <div class="centre">
-      <h1 id="timeRemaining">Time Remaining: 00:00</h1>
-      <label for="alarmSet">Set time to:</label>
-      <input id="alarmSet" type="number" />
 
-      <button id="set" type="button">Set Alarm</button>
-      <button id="stop" type="button">Stop Alarm</button>
-    </div>
-    <script src="alarmclock.js"></script>
-  </body>
-</html>
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <link rel="stylesheet" href="style.css" />
+  <title>Title here</title>
+</head>
+
+<body>
+  <div class="centre">
+    <h1 id="timeRemaining">Time Remaining: {00:00}</h1>
+    <label for="alarmSet">Set time to:</label>
+    <input id="alarmSet" type="number" />
+
+    <button id="set" type="button">Set Alarm</button>
+    <button id="stop" type="button">Stop Alarm</button>
+  </div>
+  <script src="alarmclock.js"></script>
+</body>
+
+</html>
\ No newline at end of file
