Automatically change the order due date for ordering cut off time.

We operate with a same day dispatch on all orders taken before 2.30pm. After 2.30pm all orders will be dispatched the next day. To aid our staff and ensure that the orders taken after 2.30pm are scheduled for the correct day of dispatch it would be great if there was a way of being able to set all new orders after 2.30pm to automatically be create for the next day.