JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/moment.js/2.7.0/moment-with-langs.js"></script>
<input type="button" value="5 day" q="5" t="days" >
<input type="button" value="1 day" q="1" t="days" >
<div class="date" format="DD MMM YYYY"></div>

JavaScript

$(document).ready(function(){
	$("div.date").hide();
	$("input[type=button]").click(function() {
		var $this = $(this),
            $date = $('div.date'),
            quantity = $this.attr('q'),
            type = $this.attr('t'),
            value = $date.attr('value') ? moment($date.attr('value')) : moment(new Date()),
            format = $date.attr('format');
        
        value.add(type, parseInt(quantity));
        var formattedValue = value.format(format);
        
        $date.attr('value', formattedValue).text(formattedValue);
		
		$(".date").show();
	});
})