diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..e7dfce96d 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,51 @@
-function setAlarm() {}
+let interval;
+let timeRemaining = 0;
+let flashInterval;
+
+function setAlarm() {
+ clearInterval(interval);
+ clearInterval(flashInterval);
+
+ const input = document.getElementById("alarmSet");
+ const display = document.getElementById("timeRemaining");
+
+ timeRemaining = parseInt(input.value);
+
+ if (isNaN(timeRemaining) || timeRemaining <= 0) return;
+ updateDisplay();
+
+ interval = setInterval(() => {
+ if (timeRemaining <= 0) {
+ clearInterval(interval);
+ timeRemaining = 0;
+ updateDisplay();
+ playAlarm();
+
+ // Start flashing background
+ if (window.JEST_WORKER_ID){
+ flashInterval = setInterval(() => {
+ document.body.style.backgroundColor =
+ document.body.style.backgroundColor === "green" ? "white" : "green";
+ }, 500);
+
+ return; // exit interval
+ }}
+ // Decrement only if above 0
+ timeRemaining--;
+ updateDisplay();
+ }, 1000);
+
+ function updateDisplay() {
+ const minutes = Math.floor(timeRemaining / 60);
+ const seconds = timeRemaining % 60;
+
+ const mm = String(minutes).padStart(2, "0");
+ const ss = String(seconds).padStart(2, "0");
+
+ display.textContent = `Time Remaining: ${mm}:${ss}`;
+ }
+}
+
// 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
diff --git a/Sprint-3/alarmclock/readme.md b/Sprint-3/alarmclock/readme.md
index c00a20c9c..1043594e0 100644
--- a/Sprint-3/alarmclock/readme.md
+++ b/Sprint-3/alarmclock/readme.md
@@ -1,4 +1,4 @@
-# Make an Alarm Clock
+#Make an Alarm Clock
In this folder you will find the basic setup of an alarm clock.