All dates in iCloud changes to future dates
OK, so here's the issue. I scanned in some old 35mm slides using a slide to digital converter. No big deal. Took the memory card and imported them into photos. I noticed that when imported, they had a date of 1916 (which was random at that). I selected all the photos I imported ( only from recent and only selected the photos I imported) and went to image -> adjust date and time. I put in todays date (4/23/2020) and hit update. It looked like it was taking a long time and photos seemed to hang. The MacBook Pro's fan started spinning on high after about 5 minutes. Something was happening, but photos was still hung so I forced quit it. I re-opened it and all of my photos (52K+ from before my son was born, like starting in 1998 from the old iPhotos) had future dated all the way up to year 2138. The years were all screwed up with no rhyme or reason and now there is no way to recover the original date and time in order to sort the photos correctly. There are random dates on my photos now from 2021 through 2138. I find photos of my son's birth in 2005 and apparently he's not being born for another 30 years. Any idea what happened to the dates on all of the photos and is there a way to recover/fix the original date/time of the photos?
Running latest OS (10.15.4) on MacBook Pro (2019)
MacBook Pro 15”, macOS 10.15