Set creation date by folder name

My computer crashed, but all of my pictures were backed up. They are in a folder structure based on their creation dates. The problem is that when they were copied to their backup folder, they all got new creation dates and times. How can I set all their creation dates to the date of the folder that each is in?

Also, I want to copy them to an SD card so that I can import them again. How can I do this and still preserve the new dates?

Thanks so much.

--Nate