Converts a Google Timeline export JSON file into a GPX file to be used with other applications. The JSON file is in the same directory as the python script and is named timeline.json. Try blocks are because Google has used different time formats over the years.

json-to-gpx.py

import json
import datetime

# Open the JSON file
with open('timeline.json') as f:
    data = json.load(f)

# Open a new GPX file for writing
with open('timeline.gpx', 'w') as gpx_file:
    # Write the GPX file header
    gpx_file.write('<?xml version="1.0" encoding="UTF-8"?>\n')
    gpx_file.write('<gpx version="1.1" creator="My GPS Track">\n')

    # Iterate through the timeline entries in the JSON file
    for entry in data['locations']:
        # Extract the latitude and longitude from the entry
        lat = entry['latitudeE7'] / 1e7
        lon = entry['longitudeE7'] / 1e7
        # Convert the timestamp to the timestampMs format
        timestamp = entry['timestamp']
        try:
            # Try parsing the timestamp using the first format string
            dt = datetime.datetime.strptime(timestamp, '%Y-%m-%dT%H:%M:%S.%fZ')
        except ValueError:
            # If the first format string fails, try the second format string
            try:
                # If the first format string fails, try the second format string
                dt = datetime.datetime.strptime(timestamp, '%Y-%m-%dT%H:%M:%S:%fZ')
            except ValueError:
                # If the second format string fails, try the third format string
                dt = datetime.datetime.strptime(timestamp, '%Y-%m-%dT%H:%M:%SZ')
        timestamp_ms = int(dt.timestamp()) * 1000
        # Write the location data to the GPX file
        gpx_file.write(f'  <wpt lat="{lat}" lon="{lon}">\n')
        gpx_file.write(f'    <time>{timestamp_ms}</time>\n')
        gpx_file.write('  </wpt>\n')

    # Write the GPX file footer
    gpx_file.write('</gpx>\n')