Photo Date Fixer

date_fixer.py

import piexif
import os
from shutil import copyfile
from datetime import datetime

def get_diff(path_name, alleged_date):
    alleged_date = datetime.strptime(alleged_date, '%Y:%m:%d %H:%M:%S')
    exif_dict = piexif.load(path_name)
    
    exif_date = exif_dict['0th'][piexif.ImageIFD.DateTime].decode('ascii')
    created = datetime.strptime(exif_date, '%Y:%m:%d %H:%M:%S')

    return alleged_date - created

def change_exif(path_name, diff):
    exif_dict = piexif.load(path_name)
    
    exif_date = exif_dict['0th'][piexif.ImageIFD.DateTime].decode('ascii')
    created = datetime.strptime(exif_date, '%Y:%m:%d %H:%M:%S')
    
    new_date_obj = created + diff
    new_date = new_date_obj.strftime("%Y:%m:%d %H:%M:%S").encode('ascii')

    exif_dict['0th'][piexif.ImageIFD.DateTime] = new_date
    exif_dict['Exif'][piexif.ExifIFD.DateTimeOriginal] = new_date
    exif_dict['Exif'][piexif.ExifIFD.DateTimeDigitized] = new_date
    exif_dict['1st'][piexif.ImageIFD.DateTime] = new_date

    exif_bytes = piexif.dump(exif_dict)
    piexif.insert(exif_bytes, path_name)
    
    return new_date_obj.timestamp()

def backdate_file(path_name, timestamp):
    """ Copy file so we get a new create date.
    
        This is because we can't set the date of "st_birthtime" 
        into the future, but we can backdate it.
    """
    dest_path = path_name.replace('Source', 'Updated')
    copyfile(path_name, dest_path)
    os.utime(dest_path, times=(timestamp, timestamp))

def get_files_in_folder(path, extension):
    files = []
    for r, d, f in os.walk(path):
        for file in f:
            if extension in file:
                files.append(os.path.join(r, file))
    return files

def fix_dates(directory, sample_name, alleged_date_for_sample):
    sample_path = directory + sample_name
    diff = get_diff(sample_path, alleged_date_for_sample)
    files = get_files_in_folder(directory, ".JPG")

    for file in files:
        timestamp = change_exif(file, diff)
        backdate_file(file, timestamp)

directory = "~/Documents/Date Fixer/Source/"
sample_name = "DSC08089.JPG"
alleged_date_for_sample = "2019:12:27 15:37:00"
fix_dates(directory, sample_name, alleged_date_for_sample)