There is a new message towards the top of this page with a link that takes you to this

https://proconnect.intuit.com/community/lacerte-tax-news-updates/discussion/individual-federal-tax-d...

"Early next week"

If it's just the letter you want to change, you can bring the letter up in the Forms view, right click on the page and it will take you to a document editor where you can change dates manually.  The downside is that the program will save this letter and it becomes static, it will not update to reflect any other changes made within the year.  So it you use this method, do it last before printing and saving.