problem with toJSON changing formatted date to {}'s

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C#

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I'm using fullcalendar and everything looks good except after calling toJSON to serialize the data. The dates, which are formatted like "Wed 29, June" etc., becomes "start: {}" which is not what I need. What am I missing?

Any idea why it's turning date's into {}?

Here is the script:

// first the calendar
$(document).ready(function() {
$('#calendar').fullCalendar({
    dayClick: function(date, allDay, jsEvent, view) {

        $(this).css('background-color', 'red');
    },
    header: {
        left: 'prev,next today',
        center: 'title',
        right: 'month,agendaWeek,agendaDay'
    },

    aspectRatio: 1.5,
    editable: true,
        events: "/Calendar/CalendarData"
    });
});

The date looks good in the event, but after toJSON call, the dates get converted to {}.

Here is the toJSON call:

var event = $('#calendar').fullCalendar('clientEvents');

var jlst = $.toJSON(event);

$.post("/Calendar/AddCalendar", { jsonData: jlst },
    function(data, textStatus) {
        if (textStatus != "success") {
        result = "false";
    }
});

Here is what the date looks like before call to toJSON:

"Wed Jun 23 2010 06:00:00 GMT-0400 (Eastern Daylight Time) {}"

Here is the serialized data. Note the start and end fields have changed:

"[{\"id\":\"69cf0853-40e3-4d29-8dc6-9d8b83e9696d\",
\"title\":\"Second Schedule",
\"start\":{},
\"end\":{},
\"allDay\":false,
\"_id\":\"69cf0853-40e3-4d29-8dc6-9d8b83e9696d\",
\"_start\":{},
\"_end\":{},
\"className\":[],
\"source\":\"/Calendar/CalendarData\"}]"

Any tips will be much appreciated. Thanks.