Imported movie dates don't load properly in Photos
Related to my other question.
I'm importing old iMovie clips into Photos, but Photos creates a weird random date. I've compressed the movies (old iMovie clips) to HEVC using Handbrake and I can use Better File Attributes to change the file date using the clip name, and that loads it up and looks right.
But when I send people the movie it doesn't send the date (mail, message or airdrop). And the new movie loaded into someone else's Photos doesn't just have a random date, it's a date that can't be set in Photos. It lets me set the date but then doesn't actually change it from the random date.
Date example: 28 December 3279040
Does anyone know how I can 'clean' this movie in some way so that dates work in Photos? Before or after importing.