Update rate on invoice date

Hello,

I have 2 currencies on my website, EUR(primary) and CZK(secondary).
I want to re-update currency, based on the day, when the invoice was created. Is this possible?

Example:
Customer created order 2 days ago on CZK with rate 1.35.
Today, I am creating an invoice, but rate today is lower than 2 days ago, so I want to recalculate the currency rate and apply it on every item in the order.

Basically, I want to take the currency rate not on the date of the order, but on the invoice date. Is this possible ?