Bash Command Line Script to set date and time of files (photos) based on their filename

setdate.sh

#!/bin/bash
# do not forget to run chmod 755 on this script
for i in *.mp4; do
    #file format is: YYYYmmdd_hhmmss
    echo "$i"

    day="${i:6:2}"
    month="${i:4:2}"
    year="${i:0:4}"

    hour=${i:9:2}
    min=${i:11:2}
    sec=${i:13:2}

    echo "$day/$month/$year $hour:$min:$sec"

    # set the creation adn modificiation dates of the file
    # Format is YYYYmmddhhmm.ss
    # touch -t "${i:0:8}${i:9:4}.${i:13:2}" "$i"

    # SET the exif tag dates in the file 
    # Format is YYYY:mm:dd hh:mm:ss
    exiftool -AllDates="$year:$month:$day $hour:$min:$sec" "$i"

    # use SetFile to set the date and time params (instead of touch)
    # Format is MM/DD/YYYY HH:MM:SS
    # echo "${i:4:2}/${i:6:2}/${i:0:4} ${i:9:2}:${i:11:2}:${i:13:2}"
    SetFile -d "$month/$day/$year $hour:$min:$sec" "$i"
    SetFile -m "$month/$day/$year $hour:$min:$sec" "$i"


    # SHOW the exif tag dates in the file 
    exiftool -a -G1 -s -AllDates "$i"

done