for f in *.MP4; do
    DATE=$(exiftool -s3 -MediaCreateDate "$f")
    FORMATTED=$(echo "$DATE" | sed 's/:/-/1; s/:/-/1')
    echo "origin : $FORMATTED"
    if [ -n "$DATE" ]; then
        NEWDATE=$(date -d "$FORMATTED +1 month +1 day" +"%Y:%m:%d %H:%M:%S")
        echo "Setting $f timestamp to $NEWDATE"
        exiftool "-FileModifyDate=$NEWDATE" "$f"
    else
        echo "Skipping $f: no MediaCreateDate found"
    fi
done