A Datasette-powered API for finding the time zone for a latitude/longitude point
Try the API here: http://timezones-api.now.sh/timezones/by_point
Full background and explanation: Building a location to time zone API with SpatiaLite, OpenStreetMap and Datasette
You can deploy your own copy by installing Zeit Now and running now simonw/timezones-api
Uses shapefiles from https://github.com/evansiroky/timezone-boundary-builder