JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>


 <form name="form_clock"> 
 <input type="text" name="clock_txt" size="10" id="clock_txt"> 
 </form>

JavaScript

function new_clock(){ 

clock = new Date() 
hour =   clock.getHours() 
minutes = clock.getMinutes() 
seconds = clock.getSeconds() 

print_clock= hour + " : " + minutes + " : " + seconds 

document.form_clock.clock_txt.value = print_clock


setTimeout(new_clock,1000)

}

new_clock();