Database
[{createdAt:ISODate("2020-04-10T11:35:00Z")},{createdAt:ISODate("2020-04-09T11:35:00Z")},{createdAt:ISODate("2020-04-08T11:35:00Z")},{createdAt:ISODate("2020-04-07T11:35:00Z")},{createdAt:ISODate("2020-04-06T11:35:00Z")}]
Query
db.collection.aggregate([{$match:{$expr:{$gte:["$createdAt",{$toDate:{$subtract:[{$toLong:"$$NOW"},172800000]}}]}}}])