diff --git a/javascript/chronometer.js b/javascript/chronometer.js
index 7a13496..bff9644 100644
--- a/javascript/chronometer.js
+++ b/javascript/chronometer.js
@@ -1,34 +1,65 @@
 class Chronometer {
   constructor() {
     // ... your code goes here
+       this.currentTime = 0;
+       this.intervalId = null;
+       this.milliSeconds=0;
   }
 
   start(callback) {
     // ... your code goes here
+    this.intervalId = setInterval (()=> {
+          this.milliSeconds+=10;
+          if (this.milliSeconds===1000){
+             this.milliSeconds=0;
+             this.currentTime+=1
+          }
+          if (callback)callback();
+          
+       },10);
+    
   }
 
   getMinutes() {
     // ... your code goes here
+    return Math.floor(this.currentTime/60);
   }
 
   getSeconds() {
     // ... your code goes here
+    return this.currentTime%60;
   }
+  getMilliseconds(){
+      return this.milliSeconds;
+   }
 
   computeTwoDigitNumber(value) {
     // ... your code goes here
+    if (value <10){
+      return ('0'+value);
+    }
+    else{
+      return String(value);
+    }
   }
 
   stop() {
     // ... your code goes here
+    clearInterval(this.intervalId);
   }
 
   reset() {
     // ... your code goes here
+    this.currentTime=0;
+    this.milliSeconds=0;
   }
 
   split() {
     // ... your code goes here
+    const min=this.computeTwoDigitNumber(this.getMinutes());
+    const sec=this.computeTwoDigitNumber(this.getSeconds());
+    const milli=this.computeTwoDigitNumber(Math.floor(this.getMilliseconds()/10));
+    return `${min}:${sec}:${milli}`;
   }
 }
 
diff --git a/javascript/index.js b/javascript/index.js
index fb3a43a..cbfe2fc 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 minute = chronometer.computeTwoDigitNumber(chronometer.getMinutes());
+    minDecElement.innerText=minute[0];
+    minUniElement.innerText=minute[1];
 }
 
 function printSeconds() {
   // ... your code goes here
+    const second = chronometer.computeTwoDigitNumber(chronometer.getSeconds());
+    secDecElement.innerText=second[0];
+    secUniElement.innerText=second[1];
 }
 
 // ==> BONUS
 function printMilliseconds() {
   // ... your code goes here
+    const milli=chronometer.computeTwoDigitNumber(Math.floor(chronometer.getMilliseconds()/10));
+    milDecElement.innerText=milli[0];
+    milUniElement.innerText=milli[1];
 }
 
 function printSplit() {
   // ... your code goes here
+    const li=document.createElement('li');
+    li.innerHTML=chronometer.split();
+    splitsElement.appendChild(li);
 }
 
 function clearSplits() {
   // ... your code goes here
+  splitsElement.innerHTML='';
 }
 
 function setStopBtn() {
   // ... your code goes here
+  btnLeftElement.innerHTML='STOP';
+  btnLeftElement.className='btn stop';
 }
 
 function setSplitBtn() {
   // ... your code goes here
+  btnRightElement.innerHTML='SPLIT';
+  btnRightElement.className='btn split';
 }
 
 function setStartBtn() {
   // ... your code goes here
+  btnLeftElement.innerHTML='START';
+  btnLeftElement.className='btn start';
 }
 
 function setResetBtn() {
   // ... your code goes here
+  btnRightElement.innerHTML='RESET';
+  btnRightElement.className='btn reset';
 }
 
 // Start/Stop Button
 btnLeftElement.addEventListener('click', () => {
   // ... your code goes here
+  if (btnLeftElement.classList.contains('start')){
+        chronometer.start(printTime);
+        setStopBtn();
+        setSplitBtn();
+    }
+  else{
+        chronometer.stop();
+        setStartBtn();
+        setResetBtn();
+        
+  }
 });
 
 // Reset/Split Button
 btnRightElement.addEventListener('click', () => {
   // ... your code goes here
+  if (btnRightElement.classList.contains('reset')){
+        chronometer.reset();
+        printTime();
+        clearSplits();
+    }
+  else{
+        printSplit();
+    }
 });