Binders: countdown

TODO:

<div id="counter" class="appc-dynamic">
    {{countdown date="2017-10-22 12:00:00" assign_to="remaining"}} 
    <span>{{$remaining.days}} <em>days</em></span>   
    <span>{{$remaining.hours}} <em>hours</em></span> 
    <span>{{$remaining.minutes}} <em>minutes</em></span> 
    <span>{{$remaining.seconds}} <em>seconds</em></span>
    {{/countdown}} 
</div>