[{"_id":{"$oid":"60d635cb26bec4004fb19341"},"section":"Mi Tiempo","createdAt":ISODate("2021-06-25T20:00:11.668+00:00"),"_v":0}]

db.collection.aggregate([{"$match":{"$expr":{"$eq":[{"$dateTrunc":{"date":"$createdAt","unit":"day"}},ISODate("2021-06-25T00:00:00Z")]}}}])