google_photo_date.py

import os
from datetime import datetime

# Downloaded files from Google Photo have time in UTC.
# I want to change them to use my local timezone.
tzdiff = 3600 * 9 # my timezone is +09:00

for f in os.listdir('.'):
    if '.JPG' in f or '.jpg' in f:
        stinfo = os.stat(f)
        x = datetime.fromtimestamp(stinfo.st_mtime).strftime("%Y%m%d_%H%M%S")

        print f, stinfo.st_mtime, stinfo.st_atime, x
        # if you want to embed date into filename
        # os.system('mv "%s" "%s_%s"' % (f, x, f)) # TODO: better rename function
        
        # if you want to change atime and mtime
        #os.utime(f, (stinfo.st_atime + tzdiff, stinfo.st_mtime + tzdiff))