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db.foo.aggregate({$project:{milli:{$millisecond:"$date"}}}) { "_id" : ObjectId("5984bd888a8d0117a3bbb81d"), "milli" : 0 } { "_id" : ObjectId("5984bd888a8d0117a3bbb81e"), "milli" : 374 } but db.foo.aggregate({$project:{date:{$dateFromParts:{millisecond:318,year:1970}}}}) assert: command failed: { "ok" : 0, "errmsg" : "Unrecognized argument to $dateFromParts: millisecond", "code" : 40518, "codeName" : "Location40518" } : aggregate failed // but db.foo.aggregate({$project:{date:{$dateFromParts:{milliseconds:318,year:1970}}}}) { "_id" : ObjectId("5984bd888a8d0117a3bbb81b"), "date" : ISODate("1970-01-01T00:00:00.318Z") } And $dateToParts returns: "year" : 1975, "month" : 6, "day" : 12, "hour" : 0, "minute" : 0, "second" : 0, "millisecond" : 0 So I think this milliseconds is a typo.

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xgen-internal-githook commented on Tue, 8 Aug 2017 09:39:55 +0000: Author: {'name': 'Derick Rethans', 'username': 'derickr', 'email': 'github@derickrethans.nl'} Message: SERVER-30524 dateFromParts should expect "millisecond" instead of "milliseconds" Branch: master https://github.com/mongodb/mongo/commit/8962beb1b8f8ca869a9f7ccdc4a7eeab2b84c2f4 derick commented on Sat, 5 Aug 2017 00:03:07 +0000: https://mongodbcr.appspot.com/149560001/

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