Database
[{"_id":"5f9bdace778082303c859248","createdAt":"2020-10-28T09:20:14.335Z","updatedAt":"2020-10-28T09:20:14.335Z","__v":0},{"_id":"5f9bdae3778082303c859249","createdAt":"2020-10-30T09:20:35.086Z","updatedAt":"2020-10-30T09:20:35.086Z","__v":0}]
Query
db.collection.aggregate([{$addFields:{"updatedAt":{"$substr":["$updatedAt",0,10]}}},{$match:{"updatedAt":{"$gte":"2020-10-28","$lte":"2020-10-28"}}}])