For the purpose of allowing time to process items, prove balances, and make the necessary entries on its books to determine its position for the day, a bank may fix an afternoon hour of two p.m. or later as a cutoff hour for the handling of money and items and the making of entries on its books. An item or deposit of money received on any day after a cutoff hour so fixed or after the close of the banking day may be treated as being received at the opening of the next banking day.