diff --git a/javascript/chronometer.js b/javascript/chronometer.js
index 7a13496..2c87d0e 100644
--- a/javascript/chronometer.js
+++ b/javascript/chronometer.js
@@ -1,34 +1,44 @@
 class Chronometer {
   constructor() {
-    // ... your code goes here
+    this.currentTime = 0;
+    this.intervalId = null;
   }
 
   start(callback) {
-    // ... your code goes here
+    this.intervalId = setInterval(() => {
+      this.currentTime++; // Increment by 1 each second
+  }, 1000);
   }
 
   getMinutes() {
-    // ... your code goes here
+    return Math.floor(this.currentTime / 60);
   }
 
   getSeconds() {
-    // ... your code goes here
+    return this.currentTime % 60;
+  }
+
+  getMilliseconds() {
+    return Math.floor((this.currentTime % 1000) / 10); // Convert to two-digit milliseconds
   }
 
   computeTwoDigitNumber(value) {
-    // ... your code goes here
+    return value.toString().padStart(2, '0');
   }
 
   stop() {
-    // ... your code goes here
+    clearInterval(this.intervalId);
   }
 
   reset() {
-    // ... your code goes here
+    this.currentTime = 0;
   }
 
   split() {
-    // ... your code goes here
+    const minutes = this.computeTwoDigitNumber(this.getMinutes());
+    const seconds = this.computeTwoDigitNumber(this.getSeconds());
+    const milliseconds = this.computeTwoDigitNumber(this.getMilliseconds());
+    return `${minutes}:${seconds}`;
   }
 }
 
diff --git a/javascript/index.js b/javascript/index.js
index fb3a43a..dbed2fc 100644
--- a/javascript/index.js
+++ b/javascript/index.js
@@ -15,51 +15,94 @@ const splitsElement = document.getElementById('splits');
 
 function printTime() {
   // ... your code goes here
+  printMinutes();
+  printSeconds();
+  printMilliseconds();
 }
 
 function printMinutes() {
   // ... your code goes here
+  const minutes = chronometer.computeTwoDigitNumber(chronometer.getMinutes());
+  minDec.innerHTML = minutes[0];
+  minUni.innerHTML = minutes[1];
 }
 
 function printSeconds() {
   // ... your code goes here
+  const seconds = chronometer.computeTwoDigitNumber(chronometer.getSeconds());
+  secDec.innerHTML = seconds[0];
+  secUni.innerHTML = seconds[1];
 }
 
 // ==> BONUS
 function printMilliseconds() {
   // ... your code goes here
+  const milliseconds = chronometer.computeTwoDigitNumber(chronometer.getMilliseconds());
+  milDec.innerHTML = milliseconds[0];
+  milUni.innerHTML = milliseconds[1];
 }
 
 function printSplit() {
   // ... your code goes here
+  const splitTime = chronometer.split();
+  const li = document.createElement('li');
+  li.innerHTML = splitTime;
+  splits.appendChild(li);
 }
 
 function clearSplits() {
   // ... your code goes here
+  splits.innerHTML = '';
 }
 
 function setStopBtn() {
   // ... your code goes here
+  btnLeft.classList.replace('start', 'stop');
+  btnLeft.innerHTML = 'STOP';
 }
 
 function setSplitBtn() {
   // ... your code goes here
+  btnRight.classList.replace('reset', 'split');
+  btnRight.innerHTML = 'SPLIT';
 }
 
 function setStartBtn() {
   // ... your code goes here
+  btnLeft.classList.replace('stop', 'start');
+  btnLeft.innerHTML = 'START';
 }
 
 function setResetBtn() {
   // ... your code goes here
+  btnRight.classList.replace('split', 'reset');
+  btnRight.innerHTML = 'RESET';
 }
 
 // Start/Stop Button
 btnLeftElement.addEventListener('click', () => {
   // ... your code goes here
+  if (btnLeft.classList.contains('start')) {
+    chronometer.start(printTime);
+    setStopBtn();
+    setSplitBtn();
+  } else {
+    chronometer.stop();
+    setStartBtn();
+    setResetBtn();
+  }
 });
 
 // Reset/Split Button
 btnRightElement.addEventListener('click', () => {
   // ... your code goes here
+  if (btnRight.classList.contains('reset')) {
+    chronometer.reset();
+    clearSplits();
+    printTime();
+  } else {
+    printSplit();
+  }
+
+
 });