Show elements based on difference in time with moment.js

timeDifference.html

<script src="https://s3.amazonaws.com/wildfireapp/assets/momentjs/moment.min.js" type="text/javascript"></script>

<script type="text/javascript">
$(document).ready(function(){
	
	var currentDate = moment().utc();
	//Time is set to PST (UTC minus 8 for time zone offset)
	//var startDate = moment('1-24-2013 14 -08:00', 'MM-DD-YYYY HH Z').utc();
	// Start Date should be set in following format: 1-24-2013
	// Start Time should be set in 24 hour format. So, for 2pm, use following: 14
	var startDate = moment('{{ start_date }} {{ start_time }} -08:00', 'MM-DD-YYYY HH Z').utc();
	//Setting true as third argument for diff to allow for fractions so number doesn't round itself
	var difference = currentDate.diff(startDate, 'days', true);
		
	$('.calendar li').each(function(){
		
		var indexNumber = $(this).index();
		
		if (indexNumber > difference - 1) {
			$(this).addClass('currentDay');
			$('.currentDay ~ li').removeClass('currentDay').addClass('futureDay');
			$('.currentDay').prevAll().addClass('pastDay');
		}
	});
	
});
</script>