Wrote a quick hack to rename images to the datetime string used in Android 8.1 based on EXIF data. This way I can easily merge pictures from my phone and my wife's iPhone.

rename-jpg.py

#!/usr/bin/env python
"""Wrote a quick hack to rename images to the datetime string used in 
Android 8.1 based on EXIF data. This way I can easily merge pictures from my 
phone and my wife's iPhone.

Copyright 2018 Craig Stringham

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in 
the Software without restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the 
Software, and to permit persons to whom the Software is furnished to do so, 
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
SOFTWARE.
"""
__author__='Craig Stringham'
import piexif
import os
import argparse
from datetime import datetime
import re

datefmt = r'([0-9]{4}):([0-9]{2}):([0-9]{2}) ([0-9]{2}):([0-9]{2}):([0-9]{2})'
datepat = re.compile(datefmt)


def rename_iphone_pic(filename):
    """Simple to to rename the iphone pictures to match Nexus 5x style and to 
    update the modification date as well"""
    info = piexif.load(filename)
    datestr = info['0th'][piexif.ImageIFD.DateTime].decode('utf-8')
    vals = datepat.match(datestr).groups()
    year, month, day, hour, minute, second = [int(v) for v in vals]
    newfilename = '{year}-{month:02d}-{day:02d} {hour:02d}.{minute:02d}.{second:02d}.jpg'.format(
        year=year, month=month, day=day, hour=hour, minute=minute, second=second)
    print('{} -> {}'.format(filename, newfilename))
    os.rename(filename, newfilename)
    dt = datetime(year, month, day, hour, minute, second)
    os.utime(newfilename, (dt.timestamp(), dt.timestamp()))
    

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('files', nargs='+')
    parser.add_argument('--stoperror', action='store_true')
    args = parser.parse_args()
    for f in args.files:
        try:
            rename_iphone_pic(f)
        except Exception as e:
            print('failed to convert {} because of e'.format(f, type(e).__name__))
            if args.stoperror:
                raise e

if __name__ == '__main__':
    main()