diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..ac20d702f 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,63 @@
-function setAlarm() {}
+let countdownTimer;
+let flashInterval;
+
+function setAlarm() {
+ document.getElementById("stop").addEventListener("click", () => {
+ if (flashInterval) {
+ clearInterval(flashInterval);
+ flashInterval = null;
+ document.body.style.backgroundColor = "";
+ }
+ });
+
+ let alarmTime = Number(document.querySelector("input").value);
+
+ if (!alarmTime || isNaN(alarmTime) || alarmTime <= 0) {
+ alert("Please enter a valid positive number for the alarm time");
+ return;
+ }
+
+ let timeLeft = alarmTime;
+
+ function formatTime(time) {
+ let minutes = Math.floor(time / 60);
+ let seconds = time % 60;
+ return `${minutes.toString().padStart(2, "0")}:${seconds
+ .toString()
+ .padStart(2, "0")}`;
+ }
+
+ function updateTitle(time) {
+ document.getElementById(
+ "timeRemaining"
+ ).innerHTML = `Time Remaining: ${formatTime(time)}`;
+ }
+
+ updateTitle(alarmTime);
+
+ function flashingBackground() {
+ let isRed = false;
+ flashInterval = setInterval(() => {
+ document.body.style.backgroundColor = isRed ? "#ffffff" : "#ff4444";
+ isRed = !isRed;
+ }, 400);
+ }
+
+ if (countdownTimer) {
+ clearInterval(countdownTimer);
+ }
+
+ countdownTimer = setInterval(() => {
+ timeLeft--;
+ updateTitle(timeLeft);
+
+ if (timeLeft <= 0) {
+ clearInterval(countdownTimer);
+ flashingBackground();
+ playAlarm();
+ }
+ }, 1000);
+}
// DO NOT EDIT BELOW HERE
diff --git a/Sprint-3/alarmclock/index.html b/Sprint-3/alarmclock/index.html
index 48e2e80d9..cfe17fac0 100644
--- a/Sprint-3/alarmclock/index.html
+++ b/Sprint-3/alarmclock/index.html
@@ -4,7 +4,7 @@
- Title here
+ Alarm clock app
@@ -15,6 +15,6 @@
Time Remaining: 00:00
-
+