Your html will look like this,
<div style="width:75px;display:inline">
<div class="weekdays active" style="float:left;width:75px;">Sunday</div>
<div class="weekdays" style="float:left;width:75px;display:none;">Monday</div>
<div class="weekdays" style="float:left;width:75px;display:none;">Tuesday</div>
<div class="weekdays" style="float:left;width:75px;display:none;">Wednesday</div>
<div class="weekdays" style="float:left;width:75px;display:none;">Thursday</div>
<div class="weekdays" style="float:left;width:75px;display:none;">Friday</div>
<div class="weekdays" style="float:left;width:75px;display:none;">Saturday</div>
</div>
In javascript
var dayNumber = 0;
var intervalCount = 0;
var totalDays = 7;
setInterval(function () {
var $active = $('.weekdays').parent().find(".active");
var $next = $($active).next().length == 0 ? $('.weekdays').first() : $active.next();
$active.removeClass('active').hide('slide', { direction: 'left' }, 1000);
$next.addClass('active').show('slide', { direction: 'right' }, 1000);
intervalCount++;
}, 2000);