conn = new Mongo("192.168.0.1:27017")
q = conn.getDB("quota")
retval = q.tiscali.aggregate({$match: {insert: {$gte: ISODate("2017-03-15T00:00:00.000Z"), $lt: ISODate("2017-03-16T00:00:00.000Z")}}},{$group: {_id: null, tot: {$sum: "$storage"}}}).result[0].tot