Dates all changed on all of my photos in the Photos app
I have been adding a large number of scanned photos to the Photos app with no problem, but all of a sudden, all of the dates of my 30,000 photos changed by 63 years. Photos that were dated in 1960, say, are now dated 2023.
I've opened and closed Photos, and this didn't help. I've also checked on an iOS device and these new incorrect dates are synced across all my devices.
I have been unable to find discussion threads with this exact problem. Any suggestions on what to do? Should I revert to an older saved version of Photos or of my Mac?
Many thanks to the community for any help you can provide!
MacBook Pro 15", macOS 10.15