Compare two date fields in MongoDB

Question

in my collection each document has 2 dates, modified and sync. I would like to find those which modified > sync, or sync does not exist.

I tried

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Answer 1

Simply

db.collection.find({$where:"this.modified>this.sync"})

Example

Kobkrits-MacBook-Pro-2:~ kobkrit$ mongo
MongoDB shell version: 3.2.3
connecting to: test
> db.time.insert({d1:new Date(), d2: new Date(new Date().getTime()+10000)})
WriteResult({ "nInserted" : 1 })
> db.time.find()
{ "_id" : ObjectId("577a619493653ac93093883f"), "d1" : ISODate("2016-07-04T13:16:04.167Z"), "d2" : ISODate("2016-07-04T13:16:14.167Z") }
> db.time.find({$where:"this.d1 db.time.find({$where:"this.d1>this.d2"})
> db.time.find({$where:"this.d1==this.d2"})
>