to change the date based on exif data since export from Mac Photos shows date of export using exiftool
As a test, I exported six photos as JPG files from Photos, on macOS High Sierra, into a new folder.
Then in Terminal I change directory to the new folder containing the exported photos and ran the following command to change both the create and modify date/time from the EXIF info:
for f in *; do SetFile -d &quot;$(exiftool -p '$CreateDate' -d '%m/%d/%Y %T' &quot;${f}&quot;)&quot; -m &quot;$(exiftool -p '$ModifyDate' -d '%m/%d/%Y %T' &quot;${f}&quot;)&quot; &quot;${f}&quot;; done

The prompt returned without error, and the exported files now have the original create and modify date/time.