Database
[{"createdAt":ISODate("2021-04-03T10:17:21.256Z"),"updatedAt":ISODate("2021-04-05T10:17:21.256Z")},{"createdAt":ISODate("2021-04-03T10:17:21.256Z"),"updatedAt":ISODate("2021-04-12T10:17:21.256Z")}]
Query
db.collection.aggregate([{"$match":{$expr:{$gt:["$updatedAt",{$dateAdd:{startDate:"$createdAt",unit:"day",amount:7}}]}}}])