diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..f94f08c82 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,5 +1,61 @@
-function setAlarm() {}
+let countdown = null;
+function resetAlarm() {
+ clearInterval(countdown);
+ countdown = null;
+ pauseAlarm();
+}
+
+function showError(message) {
+ const heading = document.getElementById("errorMessage");
+ heading.innerText = message;
+}
+
+function setAlarm() {
+ const input = document.getElementById("alarmSet");
+ let time = Number(input.value);
+
+ resetAlarm();
+
+ if (isNaN(time) || time < 0 || !Number.isInteger(time)) {
+ showError("Please enter a whole number of seconds.");
+ return;
+ }
+
+ document.getElementById("errorMessage").innerText = "";
+
+ if (time === 0) {
+ updateHeading(0);
+ playAlarm();
+ return;
+ }
+
+ updateHeading(time);
+
+ countdown = setInterval(() => {
+ time--;
+
+ if (time <= 0) {
+ updateHeading(0);
+ clearInterval(countdown);
+ playAlarm();
+ } else {
+ updateHeading(time);
+ }
+ }, 1000);
+}
+
+function updateHeading(time) {
+ const heading = document.getElementById("timeRemaining");
+
+ const minutes = Math.floor(time / 60);
+ const seconds = time % 60;
+
+ const mm = String(minutes).padStart(2, "0");
+ const ss = String(seconds).padStart(2, "0");
+
+ heading.innerText = `Time Remaining: ${mm}:${ss}`;
+}
// 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..d0f768562 100644
--- a/Sprint-3/alarmclock/index.html
+++ b/Sprint-3/alarmclock/index.html
@@ -4,11 +4,12 @@
- Title here
+ Alarm clock app