diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..3c87a7c47 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,40 @@
-function setAlarm() {}
+const theTime = document.getElementById("theTime");
+let timer;
+let seconds;
+
+function setAlarm() {
+ const alarmSetInput = document.getElementById("alarmSet");
+ seconds = Number(alarmSetInput.value);
+
+ if (seconds <= 0 || !Number.isInteger(seconds)) {
+ alert("Please enter a valid whole number.");
+ return;
+ }
+
+ // Stop a previous countdown if there is one
+ clearInterval(timer);
+ pauseAlarm();
+
+ // Run immediately
+ decrementTimer();
+
+ // decrement each second
+ timer = setInterval(() => decrementTimer(), 1000);
+}
+
+function decrementTimer() {
+ const minutes = Math.floor(seconds / 60);
+ const secs = seconds % 60;
+
+ theTime.textContent = `${String(minutes).padStart(2, "0")}:${String(secs).padStart(2, "0")}`;
+ if (seconds <= 0) {
+ clearInterval(timer);
+ playAlarm();
+ return;
+ }
+
+ seconds--;
+}
// DO NOT EDIT BELOW HERE
diff --git a/Sprint-3/alarmclock/index.html b/Sprint-3/alarmclock/index.html
index 48e2e80d9..9484c1256 100644
--- a/Sprint-3/alarmclock/index.html
+++ b/Sprint-3/alarmclock/index.html
@@ -4,11 +4,12 @@
- Title here
+ Alarm Clock App
-
Time Remaining: 00:00
+
Time Remaining: 00:00
+