How do I sort photos by date in iCloud albums?

I have imported many old photos into iCloud. Most of the newer ones have electronic date stamps and those go into iCloud in date order. The old photos don't have electronic date stamps and those are im-orted as though they were taken today. How can I move them to a different year? For example, how can I move a batch of photos from 2021 to say 1960? I am using an iMac IOS 10.11.6 El Capitan.