Date query with ISODate in mongodb doesn’t seem to work

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I don’t seem to be able to get even the most basic date query to work in MongoDB. With a document that looks something like this:

{
    "_id" : "foobar/201310",
    "ap" : "foobar",
    "dt" : ISODate("2013-10-01T00:00:00.000Z"),
    "tl" : 375439
}

And a query that looks like this:

{ 
    "dt" : { 
        "$gte" : { 
            "$date" : "2013-10-01T00:00:00.000Z"
        }
    }
}

I get 0 results from executing:

db.mycollection.find({
  "dt" : { "$gte" : { "$date" : "2013-10-01T00:00:00.000Z"}}
})

Any idea why this doesn’t work?

For reference, this query is being produced by Spring’s MongoTemplate so I don’t have direct control over the query that is ultimately sent to MongoDB.

(P.S.)

> db.version()
2.4.7

Thanks!

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