JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.11.2/moment.min.js"></script>
<input type="datetime-local" value="" id="time-holder">
<input type="button" value="time" name="timer" id="time">
JavaScript
$(
function(){
$('#time').click(function(){
var time = moment().format('YYYY-MM-DDThh:mm:ss');
$('#time-holder').val(time);
});
}
);