Apply to Future Submissions Only

Hello,

I would like your thoughts on being able to make a change to a field on a form and having that change apply to future entries only.

For example, I am selling widgets at $10 a piece and I've sold 1,000 of them. On Jan 1, I increase my price to 12 each. If I look at an entry before Jan 1, I would see the widgets priced at $10, but entries made on and after Jan 1, would show the new price.

It's similar to any ordering system.  I can look at my invoices on Amazon and see the price I actually purchased the item at, not the price it is available for today.

Thanks for your thoughts!