The period for delivery shall commence in the case of payment in advance on the day after the payment order is issued to the remitting bank or, in the case of other methods of payment, on the day after conclusion of the contract and shall end with the expiry of the last day of the period. If the last day of the period falls on a Saturday, Sunday or a public holiday recognized by the state at the place of delivery, the next working day shall take the place of such a day.