I have a list of events that each have a custom data attribute containing a date:

```
<ul class="event-list">
    <li class="event-item" data-event-date="20150218"></li>
    <li class="event-item" data-event-date="20150522"></li>
    <li class="event-item" data-event-date="20150928"></li> 
</ul>

<ul class="old-event-list">

</ul>

```

What I'm trying to do is select all of the `li.event-item` elements within `ul.event-list` whose data-event-date attribute is older than the current (server time) date, and then move them to `ul.old-event-list`. 

I know i can use `appendTo` to move the elements, but I have no idea how to select only the elements with an older date attribute than whatever the current server date is.

Any advice is greatly appreciated!