Altru automatically creates a new order after the completion of the last order. If a user does not login daily, you may notice when you query on sales orders, the system field Date added on the first order of the day, is reflective of the last time the user completed an order. For example, if a user processed an order on 10/1/13 and did not use the system again until 11/1/13, the first order of the day on 11/1/13 would have a Date added date of 10/1/13. 

If you are looking to output a timestamp to reflect when the order was processed, use Order complete date which includes a timestamp.