Mongoimport $date close to epoch not working

Hi,

I'm working on importing data with dates before and after epoch.
I use a timestamp (ms) with $date like this :

{"date":{"$date":1287205428000}}

It works great, gives me a document like this :

{

	"_id" : ObjectId("55ca240b026ec36b031a720c"),

	"date" : ISODate("2010-10-16T05:03:48Z")

}

It also works great with negative timestamps (before epoch).

However, I ran into some timestamps that created problems.
For timestamps corresponding to dates between 1969-12-07 and 1970-01-25, mongoimport will throw this exception :

Failed: error getting extended BSON for document #0: invalid type for $date field

The document used to generate this error is :

{"date":{"$date":2136800000}}

or

{"date":{"$date":-2136800000}}

mongoimport -d test -c test --drop < date.json

Fyi, with this timetamp (juste a day after) it's working :

{"date":{"$date":2236800000}}

I didn't find any other ticket about this specific problem.

Regards