diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..44a280ed3 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,43 @@
-function setAlarm() {}
+let timeRemaining;
+let timerId;
+function setAlarm() {
+ const input = document.getElementById("alarmSet").value;
+ const value = Number(input);
+ // Should reject and prompt for blank, negative or invalid input
+ if (input === "" || value < 0 || isNaN(value)) {
+ alert("Please enter a valid non-negative number");
+ return;
+ }
+
+ timeRemaining = value;
+
+ clearInterval(timerId);
+
+ updateDisplay();
+
+ timerId = setInterval(() => {
+ timeRemaining--;
+ updateDisplay();
+
+ if (timeRemaining <= 0) {
+ timeRemaining = 0;
+ updateDisplay();
+ clearInterval(timerId);
+ playAlarm();
+ }
+ }, 1000);
+}
+function updateDisplay() {
+ const display = document.getElementById("timeRemaining");
+
+ const minutes = Math.floor(timeRemaining / 60);
+ const seconds = timeRemaining % 60;
+
+ const formattedMinutes = String(minutes).padStart(2, "0");
+ const formattedSeconds = String(seconds).padStart(2, "0");
+
+ display.textContent = `Time Remaining: ${formattedMinutes}:${formattedSeconds}`;
+}
// 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