JSFiddle - React, Tailwind, and code Playground

HTML

<input type="time" id="StartTime" placeholder="startTime" value="05:05 AM"/>
<input type="time" id="StopTime" placeholder="stopTime" value="05:08 AM"/>


<div class="OverTime"></div>
<div class="UpTime"></div>
<div class="DownTime"></div>

CSS

.OverTime{
    border: 2px solid blue;
    height:40px;
    width:250px;
}

JavaScript

NowTime = new Date(); //Time Now
	StartTime = new Date($('#StartTime').val());
	StopTime = new Date($('#StopTime').val());

function fixIntegers(integer){
    if (integer < 0)
        integer = 0;
    if (integer < 10)
        return '0' + integer;
    return '' + integer;
}  
	function Test( difference )
	{
		var toReturn = { days: 0, hours: 0, minutes: 0, seconds: 0 };
		toReturn.seconds = fixIntegers(difference % 60);
		difference = Math.floor(difference / 60);    
			
		toReturn.minutes = fixIntegers(difference % 60);
		difference = Math.floor(difference / 60);
		
		toReturn.hours = fixIntegers(difference % 24);
		difference = Math.floor(difference / 24);
		
		toReturn.days = fixIntegers(difference);
		return toReturn;
	}

	function run()
	{
		var output = Test( Math.floor( ( NowTime - StopTime ) / 1000 ) );
		$('.OverTime').html( output.days + ':' + output.hours + ':' + output.minutes + ':' + seconds);
	}
setInterval(run, 1000)
/*=====COUNTS TIME UP TO THE FUTURE TIME=========
	function CountUpTime(){
		var RunUpTime = function () { 			
			if(StartTime < NowTime && NowTime < StopTime){
				var difference = Math.floor((NowTime -  StartTime) / 1000);
			}else if (StopTime < NowTime ){
				var difference = Math.floor((StopTime - StartTime) / 1000);		
			}
			$('.UpTime').html(days + ':' + hours + ':' + minutes + ':' + seconds);
		}
		UpTime = setInterval(RunUpTime, 1000);
	}
//==========================COUNTS DOWN FROM THE STOP-TIME[FUTURE]========================  
	function CountDownTime(){
		var RunDownTime = function () {  
			var difference = Math.floor((StopTime - NowTime) / 1000);
		}
		DownTime = setInterval(RunDownTime, 1000);
	}
*/