[{"_id":ObjectId("5d6fb50852020c4a182fc773"),"startTimestamp":"1567601927157"}]

db.collection.aggregate([{$addFields:{date:{$toDate:{$toLong:"$startTimestamp"}}}},{$addFields:{dateParts:{$dateToParts:{date:"$date"}},dayOfWeek:{$dayOfWeek:"$date"}}},{$project:{startTimestamp:1,date:{$dateToString:{date:"$date",format:"%Y-%m-%d"}},hour:"$dateParts.hour",month:"$dateParts.month",time:{$dateToString:{date:"$date",format:"%H:%M:%S"}},weekDay:{$switch:{branches:[{case:{$eq:["$dayOfWeek",1]},then:"Sunday"},{case:{$eq:["$dayOfWeek",2]},then:"Monday"},{case:{$eq:["$dayOfWeek",3]},then:"Tuesday"},{case:{$eq:["$dayOfWeek",4]},then:"Wednesday"},{case:{$eq:["$dayOfWeek",5]},then:"Thursday"},{case:{$eq:["$dayOfWeek",6]},then:"Friday"}],default:"Saturday"}}}}])