Timer countdown

countdown.html

<div class="countdown-block">
	<div class="text">Don't miss it! Token sale ends in:</div>
	<div class="countdown-wrap">
		<div class="countdown" id="countdown">
			<span id="days">30</span>
			<span id="hours">21</span>
			<span id="minutes">15</span>
			<span id="seconds">00</span>
		</div>
		<div class="countdown-text">
			<span class="day">Days</span>
			<span class="hour">Hours</span>
			<span class="min">Minutes</span>
			<span class="sec">Seconds</span>
		</div>
	</div>
</div>

countdown.js

/////////////////////////countdown 24 hours NO cookie//////////////////////////////
// set the date we're counting down to
const target_date = new Date();
target_date.setHours(target_date.getHours() + 23);
target_date.setMinutes(target_date.getMinutes() + 59);
target_date.setSeconds(target_date.getSeconds() + 59);
// variables for time units
let days, hours, minutes, seconds;

// update the tag with id "countdown" every 1 second
function start_timer() {
	// find the amount of "seconds" between now and target
	const current_date = new Date().getTime();
	let seconds_left = (target_date - current_date) / 1000;

	// do some time calculations
	days = parseInt(seconds_left / 86400);
	seconds_left = seconds_left % 86400;

	hours = parseInt(seconds_left / 3600);
	seconds_left = seconds_left % 3600;

	minutes = parseInt(seconds_left / 60);
	seconds = parseInt(seconds_left % 60);

	if (days < 10) days = "0" + days;
	if (hours < 10) hours = "0" + hours;
	if (minutes < 10) minutes = "0" + minutes;
	if (seconds < 10) seconds = "0" + seconds;
	days    = "<span id='days'>"+days+"</span>";
	hours   = "<span id='hours'>"+hours+"</span>";
	minutes = "<span id='minutes'>"+minutes+"</span>";
	seconds = "<span id='seconds'>"+seconds+"</span>";

	// format countdown string + set tag value
	$('#countdown').html(days + " : " + hours + " : " + minutes + " : " + seconds );
}

//cookie to timer
if (!Cookies.get('timer')) {
	Cookies.set('timer', target_date, { expires: 1 });
}
const cookie = Cookies.get('timer');
if (new Date(cookie) > new Date()) {
	target_date = new Date(cookie);
}
//end if cookie
start_timer(); //forced run timer
setInterval(start_timer, 1000); //set interval to timer