Set missing date/time stamps in photos

setdate.sh

#!/bin/sh

# Set missing datetime tags
find "${1:-$PWD}" -not -name ".DS_Store" -type f | while read f
do
    # Assumption that files came from Apple Photos export
    # Organized:
    #   <month> <day>, <year>
    d=$(basename "$(dirname "${f}")")
    datestamp=$(echo "${d}" | sed -E 's/(^.+[,][[:space:]])?([[:alpha:]]+[[:space:]][[:digit:]]+[,][[:space:]][[:digit:]]+)/\2/g')
    timestamp=$(date -j -f "%B %d, %Y" "$datestamp" "+%Y:%m:%d 00:00:00")

    # Fix missing date tags
    exiftool -overwrite_original_in_place -alldates="'$timestamp'" -if '(not $datetimeoriginal or not $createdate)' "${f}"
    exiftool -f -filename -make -datetimeoriginal -subsectimeoriginal -offsettimeoriginal -subseccreatedate -filecreatedate -filemodifydate -createdate -modifydate "${f}"
done