Photos OSX Chronological Order HELP!

I have what I would consider a fairly simple problem that this program should be able to address.

I have imported 200+ photos to Photos OSX. They have been imported in chronological order under the "photos" tab, however, when I create a slideshow selecting all the photos it creates a slideshow with the photos out of order.

How do I create a slideshow in the correct (from oldest to newest) chronological order?

Thanks for the help!

I will be happy to help you with this, but I have not got the time at the moment to work on a new slideshow there. When I get a spare moment, I'll put one together and report back.