Sorting by Date in json-query?

[crofty]

Hi,
Is it possible to sort by date in json-query?

Suppose I had the json:
var sortableDates = [
{first:'john',last:'doe', created_at: "Wed Aug 26 2009 10:00:00
GMT+0100 (BST)"},
{first:'joe',last:'pass', created_at: "Thu Aug 27 2009 10:00:00
GMT+0100 (BST)"},
{first:'alice',last:'doe', created_at: "Fri Aug 28 2009 10:00:00
GMT+0100 (BST)"}
]

Am I right in thinking that the 'created_at' attributes will need to
be converted to Date objects in order to be sorted correctly. If so,
how is this done in the query?

Thanks