Database
[{"createdAt":1596953069000,"totalQuantity":10,"totalAmount":100,"totalPayment":120},{"createdAt":1597039469000,"totalQuantity":20,"totalAmount":500,"totalPayment":550}]
Query
db.collection.aggregate([{$addFields:{"createdAtDate":{$toDate:"$createdAt"}}},{$group:{_id:{year:{$year:"$createdAtDate"},month:{$month:"$createdAtDate"},day:{$dayOfMonth:"$createdAtDate"}},totalQuantity:{$sum:"$totalQuantity"},totalAmount:{$sum:"$totalAmount"},totalPayment:{$sum:"$totalPayment"},count:{$sum:1}}}])