47. When promise is to be performed on a certain day, and the promisor has undertaken to perform it without application by the promisee, the promisor may perform it at any time during the usual hours of business on such day and at the place at which the promise ought to be performed.Illustration A promises to deliver goods at B's warehouse on the first January. On that day A brings the goods to B's warehouse, but after the usual hour for closing it, and they are not received. A has not performed his promise.