c# - How to use DateTimeOffset in MongoDB

public class ScheduledEvent : Event
{
    public DateTimeOffset StartDateTime { get; set; }
}

StartDateTime = 5/27/2013 2:09:00 AM +00:00 representing 05/26/2013 07:09 PM PST

What's recorded in MongoDB:

db.ScheduledEvent.find().toArray()[
    {
        "_id": BinData(3, "ZE2p31dh00qb6kglsgHgAA=="),
        "Title": "Today 26th at 7:09pm",
        "Length": "00:00:00",
        "MoreInformation": "http://1.com",
        "Speakers": [{
            "_id": BinData(3, "ndzESsQGukmYGmMgKK0EqQ=="),
            "Name": "Mathias Brandewinder"
            }
        ],
        "Location": {
            "_id": BinData(3, "AAAAAAAAAAAAAAAAAAAAAA=="),
            "Name": "Somwhere "
        },
        "Organizers": [{
            "_id": BinData(3, "AAAAAAAAAAAAAAAAAAAAAA=="),
            "Name": null
        }],
        "CreatedOn": [
            NumberLong("635052144104050898"),
            0
        ],
        "StartDateTime": [
            NumberLong("635052173400000000"),
            0
        ]
    }
]

I realize that StartDateTime is stored as Ticks in MongoDB.

var dateMarker = DateTimeOffset.UtcNow;
var nextDay = dateMarker.AddDays(1);

This query does not work:

var today = EventRepoistory
    .All()
    .Where(z => z.StartDateTime >= dateMarker 
        && z.StartDateTime < nextDay)
    .OrderByDescending(z => z.StartDateTime)
    .ToList();

I have added a query display to the Mongo C# driver which shows the following query:

{ "$query" : { "StartDateTime" : { "$gte" : [NumberLong("635052168609734070"), 0], &quo