ZoneDetect: BSD-3-Clause License
https://github.com/BertoldVdb/ZoneDetect
This is a C library that allows you to find an area a point belongs to using a
database file. A typical example would be looking up the country or timezone
given a latitude and longitude. The timezone database also contains the country information.
download the database files:
https://cdn.bertold.org/zonedetect/db/db.zip
out/timezone16.bin
- Contains data from Natural Earth, placed in the Public Domain. Contains
information from https://github.com/evansiroky/timezone-boundary-builder,
which is made available here under the Open Database License (ODbL).