Time zone boundary data: OpenStreetMap contributors and timezone-boundary-builder, ODbL 1.0.
https://www.openstreetmap.org/copyright
https://opendatacommons.org/licenses/odbl/1-0/
Exact indexed data distributed with geo-tz 8.1.10 (MIT code): https://github.com/evansiroky/node-geo-tz
Original data and source: https://github.com/evansiroky/timezone-boundary-builder/releases
This build repackages the comprehensive geo-tz index and unmodified polygon records into bounded immutable packs.