A few versions of getting date data from photos.

photoDate.py

import sys
import os, shutil, time
import subprocess
import os.path
import exifread
from datetime import datetime

def photoDateSIPS(f):
  "Return the date/time on which the given photo was taken."

  cDate = subprocess.check_output(['sips', '-g', 'creation', f])
  cDate = cDate.split('\n')[1].lstrip().split(': ')[1]
  return datetime.strptime(cDate, "%Y:%m:%d %H:%M:%S")

def photoDateMod(f):
  "Return the date/time the photo was last modified."

  cDate = time.ctime(os.path.getmtime(f))
  return datetime.strptime(cDate, "%a %b %d %H:%M:%S %Y")

def photoDateEXIF(f):
  "Return date time based on the EXIF data DateTimeOriginal"
  f = open(f, 'rb')
  tags = exifread.process_file(f)
  try:
    cDate = str(tags['EXIF DateTimeOriginal'])
  except KeyError:
    try:
      cDate = str(tags['Image DateTime'])
    except:
      return Exception
  f.close()
  try:
    output = datetime.strptime(cDate, "%Y:%m:%d %H:%M:%S")
  except:
    return Exception
  return output