Database
[{"_id":ObjectId("5d6fb50852020c4a182fc773"),"startTimestamp":"1567601927157"}]
Query
db.collection.aggregate([{"$replaceRoot":{"newRoot":{"$let":{"vars":{"date":{"$toDate":{"$toLong":"$startTimestamp"}}},"in":{"startTimestamp":"$startTimestamp","date":{"$dateToString":{"date":"$$date","format":"%d-%m-%Y"}},"month":{"$month":"$$date"},"hour":{"$hour":"$$date"},"time":{"$dateToString":{"date":"$$date","format":"%H-%M-%S"}},"weekDay":{"$dayOfWeek":"$$date"}}}}}}])