When you export photos from the Photos app the date of the file doesn't match the date the photo was taken. This is correct as the file is new and the photo in it does retain the metadata with the original date. But if you want to force the file date to match the photo date, you can do it in the Terminal or with an Automator app.
Check out How To Change File Creation Dates To Match Photo Metadata at YouTube for closed captioning and more options.
Here’s the code used in this tutorial:
for f in "$@"
do
touch -t $(date -j -f "%Y%m%d%H%M" -v-6H $(mdls $f | grep kMDItemContentCreationDate | head -n1 | awk '{gsub("[^[:digit:]]+"," ");print $1$2$3$4$5}') +%Y%m%d%H%M
202105271859) $f
done
Is it possible to do this so that the creation date is changed but not the modified date? Why am I asking? Technically speaking someone might want the creation date to be the actual original date and time from when the photo was taken but might want the modified date to be when the photo was exported (in this case, since the original was an HEIC file the export would be the JPEG version of it). If it is possible, thanks in advance. If not, I completely understand and I appreciate everything.
Douglas: That will take much more work. You’d have to save the original modified date to a variable, then recall it and set the modified date after setting the primary date.