diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..043be1831 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,44 @@
-function setAlarm() {}
+let countdownTimerId = null;
+
+function setAlarm() {
+ const heading = document.getElementById("timeRemaining");
+ const input = document.getElementById("alarmSet");
+
+ let remainingSeconds = Number(input.value);
+
+ if (!Number.isFinite(remainingSeconds) || remainingSeconds < 0) {
+ remainingSeconds = 0;
+ }
+
+ remainingSeconds = Math.floor(remainingSeconds);
+
+ if (countdownTimerId !== null) {
+ clearInterval(countdownTimerId);
+ }
+
+ const updateHeading = () => {
+ const minutes = Math.floor(remainingSeconds / 60)
+ .toString()
+ .padStart(2, "0");
+ const seconds = (remainingSeconds % 60).toString().padStart(2, "0");
+ heading.innerText = `Time Remaining: ${minutes}:${seconds}`;
+ };
+
+ updateHeading();
+
+ countdownTimerId = setInterval(() => {
+ if (remainingSeconds > 0) {
+ remainingSeconds -= 1;
+ updateHeading();
+ }
+
+ if (remainingSeconds === 0) {
+ clearInterval(countdownTimerId);
+ countdownTimerId = null;
+ playAlarm();
+ }
+ }, 1000);
+}
// DO NOT EDIT BELOW HERE
diff --git a/Sprint-3/alarmclock/index.html b/Sprint-3/alarmclock/index.html
index 48e2e80d9..ff2d3b453 100644
--- a/Sprint-3/alarmclock/index.html
+++ b/Sprint-3/alarmclock/index.html
@@ -4,7 +4,7 @@
- Title here
+ Alarm clock app