MongoDB comparing dates only without times

I guess You should make a range query between the start of the day and its ending(or without ending if you are talking about today). Something like this

db.collection.find({
  "date" : {"$gte": new Date("2015-07-07T00:00:00.000Z"),
            "$lt": new Date("2015-07-08T00:00:00.000Z")}
})