JSFiddle - React, Tailwind, and code Playground

HTML

<div class="countdown" data-expire="2018-08-30 10:00:00">
			<div>
				<span>
					Oferta<br/>
					<span class="countdown_legend">Acaba em:</span>
				</span>
			</div>

			<div>
				<span>
					<span class="days">00</span>&nbsp;&nbsp;:&nbsp;&nbsp;<br/>
					<span class="countdown_legend">Days</span>
				</span>

				<span>
					<span class="hours">00</span>&nbsp;&nbsp;:&nbsp;&nbsp;<br/>
					<span class="countdown_legend">Hrs</span>
				</span>

				<span>
					<span class="minutes">00</span>&nbsp;&nbsp;:&nbsp;&nbsp;<br/>
					<span class="countdown_legend">Min</span>
				</span>

				<span>
					<span class="seconds">00</span><br/>
					<span class="countdown_legend">Seg</span>
				</span>
			</div>
		</div>

JavaScript

setInterval(function () {
        $('.countdown').each(function (index, value) {
            var data = $(this).attr('data-expire').split(' ');
            var date = data[0].split('-');
            var hour = data[1].split(':');

            var dateEnd = new Date(date[0], date[1] - 1, date[2], hour[0], hour[1], hour[2]);
            var dateNow = new Date();
            dateNow.setMilliseconds(0);

            if (dateEnd.getTime() >= dateNow.getTime()) {
                dateEnd.setHours(dateEnd.getHours() - dateNow.getHours());
                dateEnd.setMinutes(dateEnd.getMinutes() - dateNow.getMinutes());
                dateEnd.setSeconds(dateEnd.getSeconds() - dateNow.getSeconds());

                var setHours = dateEnd.getHours();
                if (dateEnd.getHours().toString().length === 1) {
                    var setHours = '0' + dateEnd.getHours();
                }

                var setMinutes = dateEnd.getMinutes();
                if (dateEnd.getMinutes().toString().length === 1) {
                    var setMinutes = '0' + dateEnd.getMinutes();
                }

                var setSeconds = dateEnd.getSeconds();
                if (dateEnd.getSeconds().toString().length === 1) {
                    var setSeconds = '0' + dateEnd.getSeconds();
                }

                $(this).find('.hours').html(setHours);
                $(this).find('.minutes').html(setMinutes);
                $(this).find('.seconds').html(setSeconds);
            } else {
                location.reload();
            }
        });
    }, '1000');