JS Countdown timer

countdownTimer.js

$(document).ready(function() {
    window.offerTimer = {};
    offerTimer.offerEndTime = new Date(0);
    offerTimer.offerEndTime.setUTCSeconds(#getEpoch(offerEndTime)#);

    function formatNumber(number) {
        number = number.toString();
        if (number.length === 1) {
            return '0' + number;
        } else {
            return number;
        }
    }

    function updateTimer() {
        // start the countdown timer  
        var currentTime = new Date();
        var secondsLeft = (currentTime - offerTimer.offerEndTime) / 1000;

        if (secondsLeft < 0) {
            secondsLeft = parseInt(secondsLeft, 10);
            secondsLeft = Math.abs(secondsLeft);
            var days = Math.floor(secondsLeft / 86400);
            secondsLeft -= days * 86400;
            var hours = Math.floor(secondsLeft / 3600);
            secondsLeft -= hours * 3600;
            var minutes = Math.floor(secondsLeft / 60);
            var seconds = secondsLeft - minutes * 60;

            if (days == 1) $('.days-label').text(' ' + days + ' day and');
            if (days > 1)  $('.days-label').text(' ' + days + ' days and');
            $('.time-block.hours').text(formatNumber(hours));
            $('.time-block.minutes').text(formatNumber(minutes));
            $('.time-block.seconds').text(formatNumber(seconds));
            // recursive update
            setTimeout(updateTimer, 1000);
        } else {
            $('.countdown-timer').hide();
        }
    }

    $('.countdown-timer').show();
    updateTimer();
});