Can't sort by date on jqgrid


I'm very new to jquery and need some urgent help.  I have a jqgrid which is returning data, however, it needs to be sorted by date in descending order when it is loaded.  I have copied the function here:

            loadComplete: function() {
                if (jQuery(grid).jqGrid('getGridParam', 'records') == 0) {
                    // #divsearchtab').tabs
                    $("#divsearchtab").tabs("disable", tabid-1);
            $("#divsearchresults").append(returnSearchResults("Q&R", jQuery(grid).jqGrid('getGridParam', 'records')));
            colNames: ['ID', 'Title', 'Forum', 'Category', 'Date', 'EmailAddress', 'Author'],
            colModel: [
                   { name: 'ID', index: ID', width: 5, sortable: true, hidden: true },
                      { name: 'SubjectText', index:'SubjectText', width: 300 ,sortable: true},
                       { name: 'DiscForumName', index:'DiscForumName',width: 150 ,sortable: true},
                        { name: 'CategoryName',index:'CategoryName', width: 200, sortable: true },

                       { name: 'AskedWhen', index:'AskedWhen', width: 160, align:'center', sorttype:'date', formatter: 'date', formatoptions: {srcformat: "d-m-Y H:i:s", newformat: "Y-M-d H:i:s"}},
                        { name: 'EmailAddress', width: 100, hidden: true },
                         { name: 'Author', width: 100, hidden: true }
            rowNum: 50, height: 350,
            rowList: [20, 30, 50, 100, 500],
            pager: pager,
            sortname: 'AskedWhen',
            //sorttype: 'date',
            //loadonce: true,
            viewrecords: true,
            sortorder: "desc",
            caption: search
        jQuery(grid).jqGrid('navGrid', pager, { del: false, add: false, edit: false });


I also have to format the date column to a specific format. Also, can someone please explain to me what srcformat means and newformat means?

I have also supplied some of the JSON data that is usded for this grid from firebug:

cell ["25", "Example Measurement", "iceForum", 4 more...]
0 "25"
1 "Example Measurement"
2 "iceForum"
3 "30 - Instruments and Control"
4 "08/06/2002 16:15:59"
5 ""
6 "Mark Smith"
id "25"

if anyone can help me then that would be great!


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