JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/numeral.js/1.4.5/numeral.min.js"></script>
<div ng-app="timerApp">
    <div ng-controller="timerController">
        Current Time : {{time}} <br/>
        <hr/>        
        <Button ng-click="timer_start()">Start</Button> 
        <Button ng-click="timer_stop()">Stop</Button>
        <Button ng-click="timer_reset()" ng-disabled="isStartStatus">Reset</Button>
        <span>{{timerCount}}</span>
    </div>
</div>

JavaScript

var app = angular.module("timerApp", []);
app.controller("timerController",['$scope','$interval','$filter', function($scope, $interval, $filter){    
    $interval(function(){   
        $scope.time = $filter('date')(new Date(),"hh:mm:ss a", 'UTC')
    },1000,0,null);
    
    $scope.minutesleft = 0;
    $scope.secondsleft = 0;    
    $scope.hoursleft = 0;
    $scope.millisecondsleft = 0;
    $scope.timerCount = $scope.hoursleft + ":" + $scope.minutesleft + ":" + $scope.secondsleft + ":" +            $scope.millisecondsleft;
 
    $scope.isStartStatus = true;
	/**/
	var promise;
    $scope.timer_start = function(){         
        $scope.isStartStatus = true;
       promise =   $interval(function(){ 
           $scope.millisecondsleft = $scope.millisecondsleft+1;
             if($scope.millisecondsleft>100){
                 $scope.secondsleft = $scope.secondsleft+1;
                 $scope.millisecondsleft = 0;
                 if($scope.secondsleft>60){
                    $scope.minutesleft = $scope.minutesleft+1;
                     $scope.secondsleft = 0;
                     if($scope.minutesleft>60){
                        $scope.hoursleft = $scope.hoursleft+1; 
                        $scope.minutesleft = 0;
                         if($scope.hoursleft==24){
                             $scope.hoursleft = 0;
                         }
                     }
                 }
             }
                        
           $scope.timerCount = $scope.hoursleft + ":" + $scope.minutesleft + ":" + $scope.secondsleft + ":" +            $scope.millisecondsleft;
             
   },10,0,null);  
 };
    $scope.timer_stop = function(){
        $scope.isStartStatus = false;
        $interval.cancel(promise);
    }
    
    $scope.timer_reset = function(){
        $scope.minutesleft = 0;
        $scope.secondsleft = 0;    
        $scope.hoursleft = 0;
        $scope.millisecondsleft = 0;
         $scope.timerCount = $scope.hoursleft + ":" +...