You can set the creation date of a picture or video as its access and modification time: If the creation date was saved in the exif data of some media, you can extract it with "exiftool -ee -CreateDate" and then "touch" the file with that time.
To do this automatically save the following script e.g. as /usr/local/bin/exiftool_set_create_date
# exiftool_set_create_date: set the file date from exif "Creation Date".
echo -n "$@: